Choupique
WKR
- Joined
- Oct 2, 2022
- Messages
- 648
Thanks all who helped with my sizing questions. Got to make it to the range today to try out some H4831sc. Started at the starting load, 67gr w/ 250gr grand slam at 3.355" oal and worked up to 71 grains. My 4 at 71 grains went 2663, 2713, 2708, and 2709. Accuracy was good enough to hit a 8" plate at 150 yards every shot, not much to go on but the splash marks on the target were all touching. So far, I like it more than RL17. It's less scary.
I left one round riding in the magazine till the last shot. It had 0.055" of setback by the time I was done. It basically set back to the groove, and I suspect till the powder stopped it because I couldn't hear it in there anymore, and that's basically the exact book max charge and min length, which lists as compressed. The end of the bullet was fairly mangled as well, obviously banging around in the magazine a lot.
I had crimped the hell out of them with a lee factory crimp die, which I thought would eliminate this. When I tried RL17, I had the guts crimped out of one in the groove, and it still set back past the groove, again I suspect until the powder stopped it.
Any advice? It is norma brass on it's 3rd firing, full length sized.
Side note- I think my chronograph reads fast. This load lists at 2616 from a 24" barrel. The RL17 loads were far faster than book speed, and my .30-06 garand loads were also 100fps over book speed with the same barrel length.
I left one round riding in the magazine till the last shot. It had 0.055" of setback by the time I was done. It basically set back to the groove, and I suspect till the powder stopped it because I couldn't hear it in there anymore, and that's basically the exact book max charge and min length, which lists as compressed. The end of the bullet was fairly mangled as well, obviously banging around in the magazine a lot.
I had crimped the hell out of them with a lee factory crimp die, which I thought would eliminate this. When I tried RL17, I had the guts crimped out of one in the groove, and it still set back past the groove, again I suspect until the powder stopped it.
Any advice? It is norma brass on it's 3rd firing, full length sized.
Side note- I think my chronograph reads fast. This load lists at 2616 from a 24" barrel. The RL17 loads were far faster than book speed, and my .30-06 garand loads were also 100fps over book speed with the same barrel length.