![]() In the suppressed/subsonic role, it seems pretty hard to beat - the case size is about ideal for efficiently launching heavy. Several other calibers also surpass it in the supersonic role, but require bolt and magazine changes. The Wilson 300 HMR has surpassed it in the supersonic category, and without a bolt or magazine change. In ballistics, it's superior to the 30 carbine, roughly comparable to the 7.62 x 39, a bit behind the. I wouldn't hunt with it beyond about 125 or 150 yds, but I'm sure it would discourage bad guys on out to 300. 300 BLK is really what two long protracted wars in the Middle East have taught us about what is needed in the average modern gun fight: a hard-hitting, short, light, and quiet, gun that will own 0-300 yards." 223 at short to medium ranges and 2.) more accurately deliver a heavier (than typical 9mm) subsonic projectile at longer ranges all from the M-4 platform, and with only a barrel change. To the original post's question: the 300 BLK was made to do 2 things: 1.) enhance the on-target performance of the. From a 300 BO that performance was like pressing the easy button. No way you're stabilizing that bullet from a 1: 10 twist barrel. The exit hole looked like a dull broad-head made it. Maker Bullet 220 gr REX, Look at that expansion in the width of a 12 ounce Gatorade bottle it fully expanded. No doubt you can make subsonic 308 work if you want to put the effort in to it but 300 BO makes it so freaking easy. It's going to be hard to find a 308 barrel with twists that fast that is not an expensive custom order. I have a 1: 5 barrel I am getting ready to build up. I have found that at 100 yards even from a 1: 7 twist with the Maker 220 gr bullets are starting to wobble a touch. Most of these long-heavy copper bullets required a 1: 7 twist or faster to be stabilize. ![]() Left: Maker REX 220 gr all copper construction. Being all copper and heavy they are super long and require fast spins to stabilize. Some of the best performing expanding 30-cal subsonic bullets are heavy 200 gr or heavier all copper bullet from makers like Lehigh and Maker Bullets. The biggest "problem" I see w/ 300blk, is all the negligence reports of putting the round into a 5.56mm upper. But, then there's 22lr subs, from an integral bolt rifle or semi AR15/22, dedicated to it. I tend to favor the 5.56mm for a duty round and the above mentioned bolt gun for the uber quiet stuff. I have 300blk AR's, but don't shoot them much. It ended up working so good I turned it into an integrally suppressed rifle. In the meantime, of all the trial and error, I took a Savage SA, barreled it w/ a 308 bore and a 7.62x39 chamber and played w/ that. Understanding, also, you're using more powder than necessary, to get a 200+gn bullet to 1000fps.Īlso, I couldn't get subs to work reliably in a AR10, even though bolts are best for subs (sound wise). Heavy, long, pointy bullets worked the best (took up most case volume), but stability wasn't reliable until moving to a 1:8 bbl. The chamber and necks got dirty, very quickly, and loading/extraction reliability dropped. Still, chamber pressure is too low to achieve proper case expansion and chamber seal. 9gns of polyfill, between powder and projo, and this seemed to even the field. Unless delicate loading procedures were adhered to, tipping rifle up or loading slowly (to get even powder lay), velocity ES and SD weren't great. Even w/ this, the case fill % is less than ideal. ![]() There's no one great powder, but Trailboss seemed to be the best fit. While I tinkered w/ sub 308's, long before 300blk became popular, I didn't find it to be great.
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