And, yes, a supersonic Blackout can have all the same extra-pressure-induced operation symptoms as a 5.56. I need 43.5gr to push a 185 2500FPS out of a 20' bolt gun. Subsonic ammo is a good deal lower pressure than supersonic ammo, which has a SAAMI max limit of 55,000 PSI (most is around 50-52,000) most subsonic loads are running 30-35,000).
I agree that Varget is probably too slow. Its considerably faster than the optimal 300 BLK powders. I started the 180gr loads seated to the cannelure with 12, 11. 200 gr Lapua Subsonic, 8.2 gr Red Dot, WLRM, 2.20' O2H 950 fps 90F 200 gr Lapua Subsonic, 10.0 gr Trail Boss, WLRM, 2.20' O2H 967 fps 70F Come-ups 100 yds, 4.2 mil 200 yds, 9.2 mil 280 yds, 14. Primers used in the test were CCI 200 Large rifle and Winchester 9 ½ Magnum. 61ĬOAL: 2.200 inches 5-shot 75-yard group (inches): 1.22ĬOAL: 2.200 inches 5-shot 75-yard group (inches). Going by the burn rate chart, if I ONLY had those 2, blue dot might work better. slightly louder than loads with Green dot or other pistol powders, but more reliable. Federal Premium AR Match Small Rifle Primers (GM205MAR) and new Lapua brass were used in all loads.īe Alert: Publisher cannot be responsible for errors in published load data.ĬOAL: 2.070 inches 5-shot 75-yard group (inches): 1.54ĬOAL: 2.070 inches 5-shot 75-yard group (inches): 1.78ĬOAL: 2.070 inches 5-shot 75-yard group (inches). 300 Blackout Pistol with 10 1/2-inch barrel and a Swarovski 1-8x 24mm Z8i scope was used to test all loads.
Warning! DO NOT REDUCE POWDER CHARGES AS DANGEROUS PRESSURES MAY RESULT!Īn Alexander Arms Highlander.
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