DIYguy Posted September 29, 2022 Share Posted September 29, 2022 I was able to work up a 300 Blk load for subsonic and 220g bullets that pretty consistently give me groups under 1" at 50 yards using Lil' Gun. Trying to work up loads for supersonic and getting frustrated. Started with 150g Hornadys FMJ-BT, used QuickLoad and did multiple ladder load test still using Lil' Gun. Groups look great if they were a shot gun pattern. Was talking with JB (John Paul) and he recommended 125g SMK's and H110 for supersonic. Found my ingredients and started over with the 125g but Hornady 125 FMJ with cannelure. Better groups but still not consistent. Done full ladders starting from 18.2 of H110 to 19.6 in .2 increments, (20) rounds per, four strings of five. Do get and occasional four shot single touching hole with a flyer but really rare. Problem is loading on the Dillon 650 I'm getting SD's from 15 to 25, some time higher. Now to next option. I load my precision rifle loads on the Forester with all the prep and get SD's between 5 and 8. Those are for bolt gun and using neck tension. Black out is a gas gun so crimping at the cannelure for those loads. I'm using the three die Redding Comp set on the Dillon and with the small power bar for the subsonic loads getting very good loads. For the larger loads and large powder bar getting variance in powder drops up to .2 grains. I don't want to have to hand load my charges but thinking I may have too to get consistency. I have two single stage presses so could do seating with one press and crimp with the 2nd. I can't find a Redding crimp die for 300 Blk. How are others loading 300 Blk for supersonic and what results? I'm attaching my load results for any loading nerds to see what I've done so far. Reloading Recipes-Rifle (PSA 300 AAC BLK) revised2_09-29-22.pdf Quote Link to comment Share on other sites More sharing options...
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