You DO have to be careful of bullet selection. It uses the same bolt, the same magazines. 300 has more KE than the 5.56, end of story. That said, an 11.5 inch 5.56 with the proper load is a good choice, but still a compromise.Īgain, NO ONE has said KE was the yard stick. Gaining 300 ft/lbs of energy is not inconsequential, along with a reduction in blast and flash from powder burning outside the barrel. When talking SBR's it makes sense to consider a cartridge that was designed, from the ground up, around a 10" barrel. I am not emotionally invested in any cartridge. If you want to delve into a KE discussion, why stop at the 6.8? Why not the. 300 does, indeed, surpass the 5.56 without requiring a different bolt face or specialty magazines. The point, in regards to kinetic energy is the fact that the. There are plenty of 110-125 grain polymer tipped loads to use and plenty of 110-125 bullets from various manufacturers to pick from. 300 is a niche cartridge, but it fills that niche extremely well and is superlative at the job. I did, however, bring up some factors to consider. After that, I would go to a 9mm if you delete the suppressor.Ĭlick to expand.I didn't really address the 5.56 issue as the OP was asking about the. The 10mm just does really well against everything else in the space when you consider the total package.but again, not a mainline you can go buy. But no one makes that bullet and resizing and loading is more than some want to do. The terminal performance is very good as is accuracy and through both of our suppressed Glock fed AR9s would be my first choice. Staying subsonic, the pistol calibers certainly perform better than the 300BO in terms of terminal performance. If you are not running suppressed, any of them are going to be unpleasant inside, some will just do a bit more damage to your hearing. Unless you get very expensive 300BO bullets, their subsonic terminal performance is marginal at best. Not right or wrong to give more value to one variable over another based on each person's environment of intended use and skill, etc. There are a lot of variables (noise, penetration, distance) that relate to shootability and others that relate to on target performance. 223, 9mm, 300BO and 10mm from AR platforms in terms of terminal performance, suppressed and unsuppressed, super and sub-sonic. I've done a bit of comparison testing between. I shoot an Omega on my 9" BO and it is very quiet and pleasant to shoot with subs, nice little plinker, and handy as a brush gun for stalking deer (with 110g Barnes supersonic). Prob worth emailing the manufacturer for peace of mind if that course of action is followed. Not sure how they would do through housing building materials though. If you do go with 300BO, I second the very high end boutique ammo for self defense since they come in a variety of frangibility, penetration, max expansion - please note that I have not tried any of that stuff since it is too rich for my blood. I don't know a whole lot about the 45 AR except that they are out in the wild: for one example (no affiliation, just the first thing that popped up on a google search). The point is that the penetration with any caliber through wood is a lot more than I would have thought, so just don't miss the bad guy in your house. The 208g match bullets form the blackout had some minor deformity in the front 1/3 of the bullet by the hollow point where the jacket had no support from lead inside it. Most look good enough to tempt one to try and reloading the bullet after recovery even the soft un-jacketed cast lead, unless it was smashed into by a follow up bullet. From my understanding, the target HAS to be 'wet' for expansion to occur. However, even the hollow points, no matter the caliber. Most of the 45 ammo we shot was lead ball. It would be somewhat neighbor friendly, subsonic, soft shooting, and very quiet. So take that as you may, it is simply an observation.Īnd based on that observation, I would be compelled to find a 45ACP upper to suppress. My best guess on the massive real world penetration difference is the shape of the bullet having a much smaller frontal area and the 'slippery' shape. Both were fired at a distance of about 15 yards. All recovered bullets had ZERO expansion since no 'wet' impact happened. The 230g cast lead 45 would all stick in the 4th board so you could pry them out with your fingers. The 45's usually stopped around 3 boards but would get as deep as 4 boards depending on the load and projectile. If I remember right it penetrated 8-10 boards so around 16-20 inches of penetration in dried pine as these were cut to 'real' 2 inches. Shot a subsonic 208g Hornady match bullet from a 9" barreled 300BO into some rough cut 2x8's nailed together last year. I believe, but may be wrong, that the energy is indeed pretty close between the subsonic blackout and the 45 (230g at 850fps = 369ft*lb 208g at 950 = 417ft*lb) But.
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