The tougher part to account for on these heavier bullets is the rainbow trajectory. Wow, so little drop in velocity, but I guess that’s what happens when it’s poking along so slowly that wind resistance is minimal. Unless you can range accurately, it’s going to get very tough making hits past 300 yards. Zeroed for 100 yards, you’re at 10″ low by about 275. It generates a bit more energy at the muzzle than 223 and uses sane speeds, so I think it’d be a better close range deer cartridge than the 223. Very similar to ballistics on the 7.62×39, but lagging in power at 100-150 yards. It’s important to separate the 110 grain supersonic round vs the 200+ grain subsonic rounds due to their very different ballistic profiles.Įffectively, it’s a 100 yard cartridge for hunting deer. 223 magazinesįor a civilian shooter, getting into 300 Blackout when you already have an AR-15 is pretty easy: you can buy a dedicated upper to have some flexibility, or switch to a 300 Blackout barrel for a permanent mod and you’re done. The 300 Blackout was designed with a few things in mind: If only we could get 7.62×39 performance in an AR-15… And then there’s the case taper: which enables great semi automatic reliability but doesn’t work well with the straight magwell and magazines of the AR15. The case head is wide enough that you give up quite a bit of metal on bolt lugs after hogging out the bolt head. 30 in the AR-15? Some manufacturers offer AR-15’s that run 7.62×39, but that cartridge isn’t the best for the AR-15. The AR-10 delivers a lot more power but it’s heavier, gives up magazine capacity, isn’t nearly as common or standardized as the AR-15 platform, and the case capacity is a bit of a waste if you want to run subsonic rounds. Within the Armalite family, there’s the AR-10 in. Let’s dive into the 300 Blackout as it performs against the. It’s easy to convert AR-15’s to and easy to form cases if you’re into reloading. Delivering similar ballistic performance to the 7.62×39, but using a slightly lighter bullet, the 300 Blackout alleviates some hunter’s concerns around bullet mass on game AND makes for a handy suppressed round in an AR-15. Like I said, overall, a very well written treatise, easy and enjoyable to read and the author sounds like someone good to talk to at the camp after a day of hunting.The 300 Blackout, sometimes called the 300 AAC Blackout and somewhat similar to the 300 Whisper®, is what happens when you want an easy 30 caliber conversion for your AR-15. The author notes the terminal stability factor, this is the wounding mechanism that this type of load relies upon as the bullets do not expand at these low velocities unless they are made to do so (several firms make special bullets for these applications, see lehigh bullets and Lutz Moeller's website) The tendency to overpenetrate can be an issue and the aforementioned bullet designs are intended to mitigate that. We have built a 6.5 twist 300-221 Fireball for a professional shooter who uses it at long distance, suppressed, with 240 gr SMK loads. Had he used an 8 twist barrel, he might have found less issues with stability and perhaps greater accuracy. The author used a 10 twist barrel for economic reasons. One of the key factors that the author mentions is stability. 500 Whisper into the commander's hatch of a MBT at 900+ yards, using a hand gun. JD Jones did a demo at (IIRC) Aberdeen, where he was able to fire several rounds of. The practical limit of subsonic range seems to be about 200 yards.ĭedicated 45 and 50 cal subsonic rounds are used at 400-500 yards to engage mansized targets by a number of shooters, not all of whom are 8541s or similar. tool marks are a science all to themselves. ![]() other that it is perhaps more difficult but not untraceable. makes empty brass an untraceable entity.ĭon't think I need to expand on this. Yes, it is nitpicking, but I would have worded it more cautiously. To make a broad statement like that is risky. Also, the 338 x 39 has been built by more than one person and the 338-7BR is common enough that you can rent the reamer. Russians have done lost of work on this, note the 9 x 39 Grom. ![]() Plenty of research has been done, but just not that much published. It seems very few people have experimented with heavy weight, subsonic bullets fired from medium sized cartridges. If you don't mind, what wouldn't you agree with? Thanks. Have you considered 30 HRT (30 cal on 6.8 SPC)? 30 Herrett Rimless. One or two items that I am not sure I totally agree with, but overall a very well written treatise.
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