Originally Posted by
Forrest r
I choose to believe there is a rpm threshold, that's my belief, that's what I've witnessed and 1 of the things I'll pay attention to in the future as I do these tests. If anyone chooses not to say there is such a threshold, then so be it. But please don't put your beliefs and past issues with other people on me. I do understand that the threshold is bullet design/pressure related and the spin of the bullet is secondary, but I choose not to turn a blind eye to that reality either.
Thank you for the lesion on getting the bullet aligned to the bore. Right now I have:
Re-cut the throat in the bbl making it 25% longer with an angle that is designed to have 66% the new throat specifically there for bullet alignment to the bore.
That's a mechanical change at the business end where the loud button is used.
Use a forster concentricity gauge on the loaded rounds.
That's a mechanical test on the mfg end of the ammo making process.
I won't even get into the custom dies I've made not only sizing dies but bump dies that will be used at a later date.
Anyway, I simply used allot of 1 of the worst powders out there (4227) for hv with cast bullets. I did a search to see what other people recommended on this website. It seemed that 18gr to 20gr was the most recommended weight for a large # of different bullets. At least I can say/recommend 26gr of 4227 with a poorly designed bullet.:kidding:
The next test will be with H4895, huge difference the performance/pressure curve of this powder compared to the 4227.