Quote:
Originally Posted by Aguila Blanca
I ran it once for Berry's 230-grain plated round nose, and again for Berry's 185-grain plated round nose/hollow base. I load both with 5.3 grains of Winchester 231. The 230s I load to a C.O.L of 1.270, and the 185s I load to 1.250.
The powder burn rate chart I used was this one:
https://www.hodgdon.com/wp-content/u...rate-color.pdf |
What were the charge weights of the N320 and N330 you used? Did you cross check their charge weights with published data and their measured velocities?
Honestly, I think it was an error to think you can extrapolate data from Vihtavuori powders to a completely different powder (231).
The second problem was thinking that one can use a burn rate chart to make assumptions about charge weight. This is compounded by the fact that different burn rate charts rank the powders differently. For example, the Western Powders and Vihtavuori burn rate charts put 231 (HP-38) between N310 and N320 in burn rate.
Your results of things not fitting your expectations was likely due to unreasonable expectations.