Jim,
This will be a great help. I was stating with 4350 as this seems to be a good performing 7x57 propellent for lots of people for lots of years. I have measured the twist and it appears to be 8.5" and I was figuring it to be a factor against lighter bullets. Your results indicate otherwise. I just loaded some old 154 Hornady roundnoses but think I will pull them and re-do.
You have saved me a lot of time and effort.
Thanks again,
Chris
