![]() ![]() As a reference, fired from the 16-inch barrel rifle, it developed a velocity of 1,915 feet per second. Using one of my handload recipes, the pistol pushed out the projectile at about 1,737 feet per second. I figured it wouldn’t expand much, if at all, and it didn’t. It’s designed to go deep, with controlled expansion coming from higher velocities. The SST bullet is not supposed to expand at lower velocities. The Nosler hunting round left a large base position that penetrated deep. Adding the assorted debris brought the total recovered to 114 grains. The base stayed intact with only the tip of the bullet fragmenting along the way. This bullet also started to blow up about five inches into the gel block, but a much larger piece traveled about 20 inches deep. From the eight-inch CMMG pistol, they reached 1,771 feet per second. From the Daniel Defense rifle with a 16-inch barrel, they clocked in at 1,971 feet per second. I loaded these projectiles with IMR 4227 powder to the higher end of the published range. Perhaps it now resides in Las Vegas with Elvis. This last hurrah chunk-let weighed 65.5 grains. The recovered weight of all pieces along the trail came in at 87.8 grains. ![]() It left a trail of debris, finally terminating with a good chunk of the base about 17 inches into bare gelatin. The V-Max started to blow up about four inches into the gelatin. This one certainly did, even at the lower velocity generated by the CMMG AR pistol. V-Max bullets are ideal for varmint hunting as they are supposed to “blow up” in organic targets. Hornady’s V-Max load did what it was supposed to, and basically blew up. It did, and I measured average velocity from a string of shots at 2,169 feet per second. Rated at 2,350 feet per second when fired from a rifle, I expected this one to lose about 200 feet per second with the CMMGs shorter pistol barrel. I shot them to measure velocity and through Clear Ballistics gelatin blocks to see what we might expect from different combinations fired from the CMMG pistol. Some are off-the-shelf factory loads while others are handloads using common. I chose a variety of loads for this little experiment with performance ranging from light bullet, supersonic velocity to slow and heavy subsonic rounds. I also used a 16-inch-barreled Daniel Defense 300 BLK rifle for velocity comparison in some cases. All in that, this is a nice little package. I also added a Sig SB-15 Forearm Brace and an Aimpoint Micro T-2 optic for effective close-range sighting. That model handles both supersonic and subsonic 300 BLK loads with no problem. Speaking of silencers, I fired all of these tests with a SilencerCo Specwar 762 attached. This particular model features an eight-inch barrel, which keeps it compact and handy even with a suppressor attached. The test platform: CMMG’s Mk4 300 AAC Blackout Pistol.įor testing, I used a CMMG Mk4 pistol. Much of the effectiveness of that round relies upon its 3,000 feet per second velocity, so when that drops by 500 feet per second or so, it’s not as effective. It’s exactly this velocity drop that caused folks to start looking at alternatives to the 5.56mm NATO projectiles. Use of a short-barrel configuration instead of a full 16-inch rifle barrel will cause a drop in muzzle velocity up to several hundred feet per second. As one of the intents behind the development of this cartridge was to provide better terminal effectiveness when fired from short-barreled rifles, I decided to do some basic tests along those lines. Hey! You've got over 5k posts under your belt here on the forum so I know you're not a spammer.Given the level of interest in the 300 AAC Blackout (commonly referred to as 300 BLK) caliber, and my obsession with unusual chamberings, I thought it would be interesting to take a closer look at exactly what the cartridge does. The "extra expense"? For a more highly versatile cartridge in a platform that most folks already have? 47¢ per round is not competitive? You should be completely up to date before you ask IMO. If you're actually thinking about a 300BLK of some sort rather than starting an argument or concerned about the "hype", ask the folks that know and have been down this road with hunting, shooting suppressed or unsuppressed, subs and supers. ![]() It has way more advantages going for it especially out of a short barrel to my thinking. Plenty of folks say that the 300BLK was created for the sole purpose of running subs through a suppressor. Things you read on the internet these days right? If you're looking for home defense, the subsonic may not be the best way to go. I just got into 300BLK myself with a 8.5" pistol which I may end up going SBR before suppressor. I'm mainly thinking a rifle caliber as opposed to a pistol caliber out of a longer barrel from the start. Thinking subsonic this is likely the case. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |