1/12/2024 0 Comments 300 blackout subsonic ammo range![]() ![]() The heavier rounds saw no degradation in accuracy to the target but did become somewhat unpredictable after approximately ten inches of gel penetration. I am speculating the rate of twist was a bit too slow to stabilize the longer, heavier bullets in the ballistic medium. We were able to find several of the spent bullets under the table but as Phil was spotting and he could see the rounds exiting the side of the gel with a great deal of velocity. Once all the test rounds were shot we switched the blocks around and tried the heavier subsonic bullets again hoping to trap some in the gel but got the same results of exiting through the side of the end of the first block. To keep the count straight, I have wrecked my gel and ruined a range table with the 300 BLK halfway into the test. The hardcast lead bullet also exited the bottom of the first block of gel about 10 inches into the block. One of the Remington bullets exited out the bottom of the end of the first block taking a huge chunk out of my (new) range table. I did use the normal practice of shooting a round into bare gel then through three layers but it seemed the cloth had very little to no affect on the rounds. The lighter supersonic bullets stayed in the block and I was able to get penetration data. I put a clean target on the end of the last block to show if the rounds were going all the way and the Cor Bon and Remington rounds found their way all the way through. The heavy subsonic rounds became unstable at some point inside the first block (FBI standard block 6″ x 6″ x16″) and exited out (usually) the right side of the first block, opening up a hole. This is the wound channel of the Hornady 115gr factory round, more impressive performance. Here is shed 44gr of it’s weight while the bullet base was found 23″ in the gel. The Precision Component Technologies brass ballistic tip fragmented heavily in the first 8″ as you can see in the highlighted circles on the photograph. Sorry, that is a bit odd, maybe my editor will cut that out. It is like an old friend that is always ready for the range, you can learn a great deal from, and is ready to go again after a few hours in the oven. As you all may know I have become very attached to my gel. I learned right off the 300 BLK is hard on my ballistic gel, and that sucks. ![]() We had six factory loads and three reloads. Once we got to the range and set up my chronograph and ballistic gel we started right off with some of Phil’s factory rounds and went from there. The last round on the right is a Steadfast. The rounds are from left to right, Cor Bon 220gr, Barnes VorTx 110gr, Gemtech 187gr, Precision Component Technologies 90gr reload, Hornady 115gr, Hornady 125gr reload, 220gr lead hardcast reload, Steadfast 125gr Sierra Matchking, and Remington 220gr. ![]() Phil and I met midday at Hills Inc in downtown Raleigh where Clinton Jamieson, who also writes for was good enough to donate some factory Remington and Steadfast ammunition for 300 BLK as well. 300 Blackout ammunition can be somewhat tough to get a hold of and it can be on the expensive side so Phil was a great help. Phil, a member of Carolina Shooters Community online forum, was gracious enough to accompany me on the test and donate factory and reloaded 300 Blackout ammunition for the cause. If you would be interested in learning more about the 300 Blackout click here. I chose this rifle because it has a barrel length that is consistent with standard rifles chambered in that round and plus it is accurate enough that I have yet to hit any of the sky screens on my chronograph. The test platform is the Barnes Precision CQB rifle reviewed here. As popularity in the 300 Blackout/300 Whisper gains I was looking forward to this ballistic test for. ![]()
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