I've been working up some subsonic loads, and they seem to be doing OK, but I have some questions regarding stability. The loads are 308, LC 99 LR brass fully prepped, 220 gr RNSP bullets, 11 gr Unique, 210M, getting 1077-1124 fps over 11 rounds, Krieger 11 twist. I know the twist is on the slow side, but wanted to see how these bullets would do anyway.
My question is that at 200 yd, I'm not exactly getting what I would say is keyholing, but a very slightly opened up hole in paper. Not every shot, but about half, where it looks like the bullet is on the edge of stability. I've not fired these through the can yet, but wondering if I should just scrap the loads and go with a lighter bullet or if this is somewhat normal at 200yds. The paper was stapled to plywood. I noticed a little bit of the same impacts at 100, but thought it might have been something else. What are your suggestions? TIA
Geb
My question is that at 200 yd, I'm not exactly getting what I would say is keyholing, but a very slightly opened up hole in paper. Not every shot, but about half, where it looks like the bullet is on the edge of stability. I've not fired these through the can yet, but wondering if I should just scrap the loads and go with a lighter bullet or if this is somewhat normal at 200yds. The paper was stapled to plywood. I noticed a little bit of the same impacts at 100, but thought it might have been something else. What are your suggestions? TIA
Geb