i don't have quick load.
These holes were from A2400 at 980 fps. Would speeding them up to 1050 help?
This is supposed top be a 1:8 barrel. I have no personally measured it.
The powders I have that might work are:
2400
H110
AA1680 (tons of)
Unique (tons of)
Lil Gun (tons of)
@dellet any suggestions on what powder to try next? Should I try it with the kapok? or without?
The only powder faster than 2400 you have listed is unique. Without known data I’d want to run it through quickload. I’d be happy to do that later. I know that JD jones had data for HP38/231, which is faster than unique with less bulk so it may not be a bad choice. It seems like a dirty powder and that has kept me from falling in love with it.
It wouldn’t hurt to up your velocity. If the tipping goes away it’s more likely due to higher pressure than spin rate. 100 fps just won’t change rpm much. But 1000 pounds might. If your that close on spin, you probably need a faster twist.
Another thing that can help ES/SD numbers is the dreaded C word. Don’t be afraid to try a little crimp.
Remember subs are always about compromise. If you can get rid of the vertical with tightening the spreads, live with the tip. Just take it out to 2-300 yards and make sure it doesn’t turn into keyholes. You probably never will get round holes, the velocity you want, the groups you want with the quietest load and cleanest burn. It just seems too much to ask to get it all. Pick your battles.
I’m not a real big fan of anything extra in a cartridge that might collect in a suppressor. Un burned powder, lead, kapok, cotton, lube, gas checks…… just a personal taboo. A lot of people say I’m paranoid about it. Been able to avoid it by spending more time on load development and powder changes.
The first loads take time. And more time. Once you get a couple working, it gets pretty easy, with some time. Look at what the big kids are doing at long range for prep, and apply it. A lot of what they do really only matters in the last couple hundred yards, in the trans sonic part of the flight. Subsonic shooting is right there from the muzzle. A 1% change with a fifty grain load is a lot smaller with a 10 grain load. That thought alone helped me more than anything shooting subs.
Keep at it, did I mention first loads take time?