All comments are held for moderation and will appear after approval. I cut a couple even with my shorter gas system on the subsonic. Router Jig Extreme (compatible with any AR caliber). For anything larger, or at distance, we would recommend going supersonic. Save the heavier and stouter parts for supersonic. If you don't have any experience with a suppressor I recommend you do your homework on the different models as cost doesn't always mean best sound suppression or quality. Range Report: How Good Is the Smith and Wesson M&P FPC 9mm Folding Carbine? So, being new to AGBs, here are my few thoughts and what I think I've figured out on their AGB. Even the SOF guys will still do 99% of their gunfighting with supersonic rounds. Shooting 300 Blackout Suppressed and Unsuppressed Run a pistol-length location gas port (four inches ahead of the chamber area) with a carbine-length (16-inch) barrel. Sub Sonic Ammo out of an Unsuppressed 300 Blackout Young and Tactical 3.49K subscribers 213 25K views 3 years ago In this video Trent shoots his 300 blackout to see if it can run sub. OK, so it is a ridiculous thing to open up ports and basically ruin perfectly good barrels. Theyre not normally as overt, but theyre thereextra-quick bolt unlocking, excessive carrier velocity and on down that list. by bluebird Fri May 27, 2011 1:43 am, Post If your reloading you shouldn't have to worry about what the manufactures are focusing on with the supersonic. }, Editor In Chief- TFB Factory ammo is unreasonable high, but reloads can be as cheap as 223. Pandemic pricing is not over yet so if you are already an AR-15 owner, it's won't take much more for you to be able to start shooting 300 BLK. [emailprotected], Reduced risk of over penetration from a pass through projectile. Thank you for a clear and consisce desciption. Is .300 BlackOut Subsonic unsuppressed significantly quieter - Reddit } And, time is also ticking away with respect to the flaming consumption of the propellant. In the dark, maybe just up out of bed, and then theres a blinding fireball and an ear-splitting report, and its difficult to recover situational awareness, especially at my age, and even with my rail-mounted light. I have found that the best overall approach to subsonic function is to shorten gas system length. Others chose faster and lighter rounds because its a rifle, not a pistol. On my build, I chose to accept the one-trick-pony approach. I feel the concept by design puts less stress on the internal parts and I hope manufacturers continue developing in that direction in order to better refine how we adjust ar gas systems. Other than to check performance on a chrony or to look for keyholing? I like the x39 because I can blast cheap steel cased ammo and not have to scrounge for brass. As others have pointed out, if you're going to take the longer barrel and not suppress it (or shoot supers suppressed) then there are other calibers that work well in the AR15 platform and give better performance. Powders are selected for optimal performance and consistency from lot to lot. Fixed gas block and std buffer spring. Almost forgot about ammo. Home Ammunition Subsonic Success: Getting Good Function From a .300 Blackout. Honestly, my main interest is in the short, subsonic, suppressed, select fire 300 black. The 300BLK is a very capable rifle in the 16 inch configuration and can take any 4 or 2 legged animal that either the 7.62X39 or the 6.8 can in normal shooting ranges of up to 300 yards. Thats another debate for others to work through in other articles, but its my story and Im sticking to it. .300 Blackout Subsonic Success Tips - The K-Var Armory If you're looking for "Hollywood Quiet", these are the loads you want to be shooting. Before i got a 6.8, a 16" .300 unsuppressed was my primary hunting rifle. The supersonic, though, needs a gas port positioned at seven inches forward, standard carbine location. Reason for that is because the 300 BLK uses almost all the same AR parts used for a rifle chambered in .223/5.56mm. I can say that it hasnt seized up the way other restrictive style blocks have, and I feel thats a good sign. Subsonic 300 Blackout Ballistics - Velocity & Gel Test Results Maybe a greater margin of error for nicking a vital organ as a result of larger bullet expansion. margin-top: 6px; That's why I have 3. You dont have an issue with your 300blk if it wont run subsonic ammo UNSUPPRESSED! Go 300blk pistol. user-select: none; No big surprise guys but Short barrel+weak ammo+ no backpressure=shit reliability ps. ZTAwMjMwYmQ2M2ZjMTc1ZjMxYzkwMGE2NzlkNjg2NWRkZWNhZTFkZmJmZDNm Winchester Super Suppressed Ammo 300 AAC Blackout Subsonic - MidwayUSA From experience the .300blk subsonic is an amazingly fun round to shoot suppressed and it's the only way to shoot it reliably, but it's well worth it! A friend of mine likes to hunt with a 16" 300 blk over his 6.8 when hunting everything from deer, hogs and coyotes. border-color: #ffc107; I forgot to say, 175 grain 3-gun ammo is being loaded right now - but only 10,000 rounds at first, so none will be for sale. document.write(new Date().getFullYear()) Copyright Hornady, Privacy Policy | CCPA Request | Accessibility Policy | Terms of Use, Designed and developed by IdeaBank Marketing. by doubloon Fri May 27, 2011 9:49 am, Post .300 Blackout is an intermediate caliber that performs with a better ballistic capability than 5.56x45mm while retaining the same round capacity using a standard M4 magazine. The Mission of Cheaper Than Dirt! 5 Best .300 Blackout Barrels | invoqe MmI2MDAzY2VkZmQ4MzZiZmU1OWQzZjU2ZDIxMmM4OTBjMGM2NDQ3YWEzNTUz UPDATE: SUBSONIC CYCLING ISSUES -300BlkTalk ODdjMzY2OGY3ZTFlNmE1NzZmODA4NTY2MjM5YzAwNTRjMTc1MTdiZTkzZjE0 Subsonic .300 Blackout is plenty powerful, in my estimation, and with radically better shootability than a higher-pressure carbine loading. When I first built a .300, I couldnt get it to run reliably with bolt-over base failures, double feeds, etc. 300 Blackout 190 gr Sub-X Subsonic - Hornady Manufacturing, Inc Share your tips in the comment section below. Subsonics cycle with a suppressor almost universally with all barrel makes. MjFlNGIwYjNkNjAzOWNhNTg4NTk2Y2VhODViMjg3YmI4OTgwMmExYmVmNDlk -moz-user-select: none; And! It won't be a huge difference though, and both will be loud indoors. 80% Arms sells AR-15 and .308 80% Lower Receivers, 80% Lower Jigs and other accessories which allow you to legally build a firearm at home in most states. So while someone may not be able to pinpoint where they are being shot at from, they're still going to be very aware that they ARE being shot at. 300BLK, shooting subsonics suppressed or unsuppressed? Suppressors - Subsonic 300 Blackout Suppressor Short Can Short List Just because it's not ideal, doesn't mean it can't be suppressed. 's blog. Have you had success getting good function from a .300 Blackout? Kind of like haircuts: they can take it off but cant put it back. Any use of this content without express written consent is prohibited. . ATI Introduces the Omni Hybrid Maxx Rifle - The Shooter's Log, .300 AAC Blackout: Speak Softly and Carry a Big Stick - The Shooter's Log, Washington Takes Oppression of Gun Owners to New Lows, Finding a Firearm: My Wifes First Pistol, Throwback Thursday: 5 Long-Slide Pistols I Cant Live Without. 10 Things You Must Know About Subsonic AmmoBefore Ever Firing A Round Oh, my only hog of this year so far was with a 16" Noveske 300BLK. I enjoy them just as much as the short ones. OWEyN2JmMTE0ZGM2MzkxYjdhZDc1N2EzYzNhOGQzY2I4NDNkNTJkYjI1MDcy Suggested buffer weight for 300 B.O. unsuppresed : r/300BLK - Reddit by este Mon Feb 06, 2012 10:16 pm, Post NjZlZTcwZjdmYjA0OTI3OTM0OTcwZmVlOTk5ZjFhOGJhNDRiZTY0MDE4MWJh You must log in or register to reply here. I love my 300 Pistol. YjYzYTFjNjg3ODIxNzc4MTIwMDYxZmFlYjc5YjAzZjQzODIxYTUzNTYwZDlj I really like the FAL adjustable gas system. For the love of goodness gentleman, I wish I didnt have to make this post but Ive seen about 10 on this subject in the past week. They just expected people to know this. It was frustrating having so many issues with subsonic rounds and I had no interest or desire to get a suppresser. Id suggest running a standard USGI-spec buffer and plain old standard variety carbine-length spring for subsonic. The 16" bbl Blackouts do give more velocity for hunting than the short ones do. Thats port pressure. Not technically the same as chamber pressure, but its from the same source. vertical-align: middle; Actually by far the most work being done for 300 BLK is supersonic. Probably the most prolific in recent years is the .300 blackout, designed specifically to accommodate both subsonic and supersonic loads in the same rifle with minimal adjustments. For a better experience, please enable JavaScript in your browser before proceeding. A 16" .300 blackout gun running supers and suppressed is still pretty friggin quiet. You could run with subsonic rounds for quiet engagements while equipped with a suppressor to maintain the element of surprise and your hearing. So if youre set on trying out 300 Blackout yourself, complete a build with your own 80 percent lower receiver today with an easy to use universal. 300 Blackout 9" Noveske Barrel (pistol length gas system) STAG Upper and STAG Lower ? Introducing the latest products from the worldwide leader in ammunition. In a possible third part of the series, Im considering asking a few hunters and invasive species control experts (wild hog eradicators) for their opinion. Otherwise, if you're not going to make it a pistol, then just stick w/ 5.56mm. Heavy for caliber bullets are often used to off-set lack of velocity and still provide great short to medium range performance. Btw: Supersonic ammo is also a really bad idea because of the VERY loud report and large muzzle flash. ODE2NzBiY2U5OTUxNjZhZTJhYmFkOTZlNzc1MDdhMDdmNmRiMTEzZDRmZWI0 Now, there are some very effective flash suppressors out there, but they dont take a bit off the noise. .btn:not(:disabled):not(.disabled) { An argument for another day. MWUwMTJhYWQ1MzViMzNjMzIzMTFmOTIxMWU0NjA0Nzg5ZTIyMTgwNDUwMjg4 Expanding subsonic bullets have almost twice the material to work with which allows them to expand much larger than lighter expanding supersonic bullets sometimes as much as three times original bullet diameter with machined solid copper. Same with the 16" 7.62x39 upper I got from PSA. I still can't find supers most of the time. 6.5 or 6.8 either one beats the 300. Home defense in its most typical form is about getting yourself and your loved ones off the X. It gives one performance close to that of a .308 Win in a more short action such as the AR's have. I see you have some rounds made to expand in this article. These are not as common now as they once were, but an AR-15 carrier doesnt have as long of a full-profile section on its body as does the USGI-standard M16-format carrier (which is far and away the most common now). And a small percentage of you claimed that using a 300BLK AR15 in a life or death situation was nothing more than a mall ninjas wet dream. if running nothing special and you just want a 30 bore get a PSA 7.62 x 39 upper kit. I have multiple 16 inch barrels in 300BLK and they work perfect. If you believe Wordfence should be allowing you access to this site, please let them know using the steps below so they can investigate why this is happening. Scan this QR code to download the app now. Unique powders optimized for subsonic use result in a low flash signature, ideal for either suppressed or unsuppressed performance. Hornady Subsonic Ammunition doesnt have the loud report of a supersonic round, and paired with a suppressor, its even quieter. Subsonic Handgun utilizes tried-and-true XTP bullets that expand reliably at subsonic velocities. No it is NOT worth it unless you are going to go shorter than 10.5". The .300 AAC blackout has the advantage of having a more effective shape for delivering energy, expanding, and tumbling through vital organs, but it's main advantage while subsonic is it's quiet report, and the ability to make multiple hits on target very rapidly. Without the velocity of supersonic rounds, subsonic 300 Blackout rounds are not able to routinely make clean shots against large game. ZDJlOTQ0YzNkMDAyZTc2YjY5MWFjY2Q4MzIxOGVlNTAzYTQ1ZWZlMmU0MTQ0 I dont know if it will have the short comings of flame cutting as listed above. .300 Blackout, Supersonic vs Subsonic - 80 Percent Arms This list is our best 300 Blackout Subsonic ammo, you can check out all subsonic 300 Blackout ammo here. Fact of the matter, it is AK ballistics in the reliable AR platform. The value of the 300 Blackout boils down to two factors. margin-bottom: 10px; MWZhMzE4M2MxNmUzYTg2YmQxN2ZjMWFjOWY0ZWFjYThkZTNjZjU0NzJiZGEy Discussion about rifles in 300 AAC BLACKOUT (7.62x35mm), hosted by the creator of the cartridge. Hopefully, this thread will have a few more good responses and I'll just post a link to this discussion whenever a new 300 owner decides to ruin their barrel. Be first to know about promotions and new product launches. MjI3YjA3MzA4NzgwNTg1ZWFhZDYzZDIwODBiN2U5YzkzNDkwN2NlYzVkNmRl by 300Blk Fri May 27, 2011 7:25 am, Post If there's no can then this is a dumb argument. The last one is especially critical in the context of the 2021 market for firearms, accessories and ammunition. Thought about getting a 10.5 barrel to see if it corrects the cycling issue. Does some damage with Barnes vor-tx bullets. I usually end up cutting 3-4 coils from the spring to add an edge of reliability to a subsonic. Get an AAC barrel (pistol gas) and run M4 style BCG, buffer and spring and you are GTG with super or subs. If have two, 6.8s and you are thinking of a 300 blk.i say do it. We stand behind all our products and were here to support you. text-align: center; I eventually got an m-16 bolt carrier and heavy buffer. We offer several different.300 blackout build kits for whatever your needs are. Although still considered to be on the higher end of the price spectrum, supersonic 300 BLK is the slightly more affordable option sitting at $0.75 - $1.15 per round. by JasonM Mon Feb 06, 2012 8:09 pm, Post Copyright 1996-2023 AR15.COM LLC. That really all has to do with bullet design/bullet engineering. On a different day, I traveled to a suppressor-friendly state and met up with . Why run subsonics without a suppressor? -300BlkTalk But that's exactly what it was designed for. In keeping with this motif, an AR-15-style bolt carrier works best with subsonic. 300 Blackout Supersonic vs Subsonic - What is the difference? I happen to be one of those people. I keep seeing guys new to the 300 BLK on other forums asking about how to open gas ports to reliably run subs without a suppressor and I just don't get it. by LYNRDSKYNRD Fri May 27, 2011 8:43 am, Post Unless your 300 is just going to be a range toy, the cost savings isnt worth the risk. Interested in picking up your own, Pandemic pricing is not over yet so if you are already an AR-15 owner, it's won't take much more for you to be able to start shooting 300 BLK. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. [ARCHIVED THREAD] - 300 Blackout, is it worth it if you can not go short or suppressed? Discussion about rifles in 300 AAC BLACKOUT (7.62x35mm), hosted by the creator of the cartridge. The idea that you can have a single setup of buffer mass, gas port size and gas system length that will handle 28kpsi unsuppressed subsonic loads and suppressed 55kpsi supersonic loads equally well is ludicrous on its face. .223/5.56 is what you should buy. Not casting doubt on it's supersonic capabilities, but if I'm shooting a .308" diameter 16" supersonic, it'll be on a 7.62 NATO type carbine AR platform. What is the diameter that your expanded subsonic .300 will achieve in the human anatomy vs that of the much wider 45(+P or even non +P for that matter)? We reserve the right to edit as appropriate, delete profane, harassing, abusive and spam comments or posts, and block repeat offenders. HI. It all depends on what you want to do.Tons of 556 brass to roll your ownI like the 300 blackout in the carbine role..16 inch with supersonicsgreat venison and critter getter.I have no desire to spend the cash.and buy the stamp and the can Yeah the whole reason to get a 300BLK is for subsonic rounds to be hearing safe quiet with a suppressor. The information provided here does not represent the views of Cheaper Than Dirt! There are so many custom bullets and loads being developed. America's Ultimate Shooting Sports Discounter, Subsonic Success: Getting Good Function From a .300 Blackout, The preceding is a specially-adapted excerpt from, Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Pinterest (Opens in new window). Suppressed 5.56 is around 135db. Hornady Subsonic Ammunition designed for accuracy and performance below the speed of sound now comes in both rifle and handgun loads. Is 300BLK worth it in supersonic unsuppressed ONLY appl.? -300BlkTalk I dont like that I need a tool and I hope someone makes one that is finger adjustable or at least adjusted by using a round. For the vast majority of applications, supersonic ammunition is the most practical choice, and it has the added benefit of being cheaper as well. Originally born of a US SOCOM contract with Advanced Armament Corporation (hence the.300 AAC Blackout name), our nations Special Operations Forces wanted a weapon system that could switch between sub-sonic and super-sonic rounds effectively and quickly, from a compact package, while not having to move away from the M4 based platforms they were already familiar with. Some of you stated that you would pick heavier and quieter rounds to preserve situational awareness and communication abilities. NzAxZTZjNWI1YTkzYjU4MzU0Nzc0YTU2MjFmMmYyNGQ0OTk3N2ZmN2QzYmZh So, if you think .45 ACP is a reliable choice for a defensive round, subsonic Blackout beats it. 300blk subs are POINTLESS to run without a can, they're still loud, less effective and unreliable, with a can yes they are super quiet and badass. cursor: pointer; So, despite what Ive heard from many theorizing, you really cant run supersonic and subsonic loads through the same gun, with no modifications having been made to the gun. So this brings me to my final points/questions. I had ran the scenario of a suppressed subsonic .300 blackout against a suppressed 45/45+P (still subsonic). Matter of fact of the 5 deer I took this past season, 1 was with a Ruger American Ranch Rifle in 300BLK, and 1 was with a 16" Daniel Defense 300BLK. We utilize state of the art 5-axis CNC machines to mill all our .308 and AR-15 80 percent lower receivers to incredibly precise tolerances using premium billet aluminum. Would have spent my money on a Garand or old levergun. I have the SA Victor .308 rifle with the adjustable gas block. SILENCER SATURDAY #37: Subsonic 300BLK Shootout. Bleed off/non restrictive, finger adjustable, battle proven, reliable. There is no noise from the action or any created via the ejection process as noticed in a semi automatic firearm. Buy American Eagle 300BLK 200gr Suppressor. If you do plan on shooting suppressed or aiming at targets within short distances then proceed with the 300 blackout platform. As a comparison, a 230 grain round of Federal JST .45ACP ammunition has a muzzle velocity of 863 fps and has 380 ft/lbs of energy at the muzzle when fired from a 1911. Yes. Access features of the Reloading Handbook on your mobile device with the Reloading App. 300 Blackout Subsonic Subsonic rounds hold one key advantage, they run really quiet when suppressed. font-size: 1rem; Whats more, subsonic ammo is a good deal lower pressure than supersonic ammo, which has a SAAMI max limit of 55,000 PSI (most is around 50-52,000); most subsonic loads are running 30-35,000. N2M2ZTg5ODdhMWQ0ZjA0YzY1Y2RkYzQ0OGUwNmRmZGYzODg5MWVjNzk1YjMx I had been considering the .300 Blackout for a while too. MjgxYmJjNjRlYjU0NTA4Y2QxZmMxNmNkZjVlOTUzM2M2YzUyYWZkM2E1M2U3 In terms of ballistics and terminal performance, supersonic is where 300 BLK really shines, especially in SBRs, and especially compared to 5.56 for short to mid-range use. Here is what I know about full power ammo: Excellent, more than enough variety to make a decision. Best Subsonic 300 AAC Blackout Ammo - midwayusa.com I'd recommend holding onto the subsonic .300blk ammo until you get an approved tax stamp for a suppressor. There is no noise from the action or any created via the ejection process as noticed in a semi automatic firearm. I probably would since you've already got the 6.8 spc rifles. Ive written thousands of words about its evils and ways to lower it for other applications. I dont think thats really a factor. Due to NFA laws in my home state, two different guns were used for this test. I don't think the 300blk is the best supersonic only round. I have AR's in .22, 9mm, x39, .223, 6.5G and .308. I've thought about building a .300, but don't see the need.. The additional bullet weight keeps the rounds from breaking the sound barrier, and gives them as much energy as possible. Subsonics cycle with a suppressor almost universally with all barrel makes. ZDUxNWQzNTY2ZTJiNjVhN2RiMzgwOWMxNWVlNDlhN2UyYzM3MTRiOGEzN2Zh Basically run it like a subgun. YTZjMjk4NWM1MTdlNTA0ODc1NTQ5ZmRkODE5MzkwNjAyNmQwZTc0M2RhOWY2 Not my thread, but I think I was just sold in what to do with my resent acquisition. OTRlZDE0ZDEyNzgwZjIxZjFlZDdhOGQ3YWVlNWJjZjQyZjg4N2Q0YTQwNDhj No room for a dissertation on gas system operation, but as the gas expands behind the bullet traveling down the barrel bore, an increasingly greater volume is available for the gas to occupy. Essentially, all you'd need is an upper receiver with a 300 blackout barrel and you'd be good to go since the 300 blackout magazine is the exact same as normal STANAG/NATO magazines. The armor was going to charge me a lot of money to find the problem until CMMG tech support told me. It has a adjustable gas block with two settings, smaller opening and larger opening. Just recently purchased a pistol upper kit for thr build Im working on. I had read those can cause more fed issue than FMJ in the AR platform. NjI2MDFhZjNkMzY1NTA2MTQxNDNlYjJmMDNhNTQwOWM1ODc5MGRhZWY4Njlk With bullet weights in the 190-220 grain range, and a muzzle velocity below 1,100 FPS, 300 Blackout is one of the best cartridges for shooting subsonic rounds. Understatement: .300 Blackout (aka AAC) is a popular cartridge among AR-15 fans. NTM5OTc1MGMzYzdhYTJiZGM5NmZjOGU0NWNhYjI0NDhjZjc5NWJjYWIxOThm OTdmMTQ0NThiYmQ1YTBkNDc2NGIwN2E1NzFiZTVjMDVlMjJhZTViNTU0YmI5 I have it specifically because I don't want to hunt deer with a 5.56, and it's the easiest cheapest conversion for a AR-15 to make it a viable hunting rifle imo. by hugegator Mon Feb 06, 2012 7:34 pm, Post The 300BLK can run both super and subsonic ammo with a change of a magazine. Given equal penetration a larger bullet will damage more tissue and cause more bleeding. MmQ0NGIwYWY0ZDkzMjQ3MTA3YjE5MTM0ZDFkNzFjZmU4YTNkODkwNGE5YWFl Given your situation, a "pistol" setup may be in order. 300 was designed to fill the short and quiet roll. ZmFhY2U2NzcyNzJhN2Q2YzJkN2FhYWEwMzYwMDBjOTY0ZmFjMGE1NzMyNWIx On the other hand, supersonic offerings, when combined with suppression, will still conceal ones position and affords longer range lethality due to flatter shooting, lower weight bullets. Supersonic ammunition will provide more range, energy delivered on target, and less drop or wind-drift at range. It's that quiet. - So, the Mode 1 set screw, fully inserted, allows the maximum amount to gas to be used in cycling the weapon? The .300blk round has skyrocketed in popularity the past decade. The newer braces are less ugly & stupid than just a couple years ago. ZmUxYmM0MjAwZCIsInNpZ25hdHVyZSI6IjZiNGY3ZjE4ZWI4NWIwNmFlNTli YTMyZGRiMDU5NDZiNjA1ZmIwMjgwZTgwMWE0ODkxZGYwMzFiZWRjMTU3In0= Civil? 300BLK is the most versatile centerfire cartridge in existence and an excellent HD choice. Thanks for the info and well reasoned opinions. The preceding is a specially-adapted excerpt from Glens newest book, Americas Gun: The Practical AR15. That' FNG / New Forum Member today, registering just after my first range session with my new SA SAINT .300 Blackout pistol. I think carbine length systems and 16 barrels are part of the problem with .300 blk. I was waiting until after the SHOT SHOW before I bought a suppressor to see what new thing came out. Most factory .300 Blackout subsonic loads are a little more powerful than a routine .45 ACP handgun loading, if we're going on (the admittedly incomplete) calculated energy figures. Download the app DOWNLOAD A suppressed supersonic load will have a lot more gas coming back into the action compared to an unsuppressed subsonic load (these two examples are the extremes). I keep seeing guys new to the 300 BLK on other forums asking about how to open gas ports to reliably run subs without a suppressor and I just don't get it. border: 1px solid transparent; It is nice to hear other shooters . I have an SBR as well in 300BLK which is more fun but when traveling out of state it's easier to just take my 16". The 7.62x39mm is another that can be made to be a great subsonic cartridge (but most factory ammo is supersonic). What's louder unsuppressed? 9mm vs. 300 blackout (subsonic) Unless you have rare earth metals coming out consistently from at least one end of your body the average person might not be able to afford consistent training with subsonic 300 BLK to be proficient. border-radius: .25rem; ODE1ZDM1NjM4Zjc1Yzg1OGZlODViYzdmMGM1Y2RkZWI1NDVhODQxZjI4YmRl The first question to consider before you ask if you ought to use 300 blackout supersonic vs subsonic is whether or not you plan on shooting suppressed. ( 3) Write a Review Ask a Question. So while many believe .45 ACP to be the mighty fist of God, we know today that pretty much ALL handgun rounds are pretty terrible at stopping threats. by Tom12.7 Fri May 27, 2011 7:58 am, Post Subsonic rounds have about the same energy on target as a .45 ACP round. If you want a combat rifle with a hard-hitting round, .300blk has you covered. Supersonic is your traditional rifle round.