Stormin.40
Member
- Joined
- Feb 17, 2011
- Messages
- 477
I tested some 357 magnum load over the chrony the other day and was disappointed with the extreme spread. I used Standard Small Pistol Primers, should I have used Magnum with AA#9? I know the amount of crimp can effect this as well, I crimped as firm as I felt comfortable with without crushing the case, used RCBS roll crimp die. Seat and crimp in separate steps, cases were not trimed.
158gr Hornady XTP with AA#9, 13.4gr (ES 102), 13.6gr (ES 114), & 13.8gr (ES 76). Velocity gain from 13.4-13.8 was only 10fps given 13.8gr is max per Accurate Arms load data I expect I have reached the top end load.
The A2400 loads I checked the same day, 13.9gr and 14.3gr, were a little better but still had ES at 66 & 72.
I need work on more load development but was wondering if I should test with magnum primers? I am using a 4" S&W 586.
158gr Hornady XTP with AA#9, 13.4gr (ES 102), 13.6gr (ES 114), & 13.8gr (ES 76). Velocity gain from 13.4-13.8 was only 10fps given 13.8gr is max per Accurate Arms load data I expect I have reached the top end load.
The A2400 loads I checked the same day, 13.9gr and 14.3gr, were a little better but still had ES at 66 & 72.
I need work on more load development but was wondering if I should test with magnum primers? I am using a 4" S&W 586.