both would require ammo fired in the gun so they can be reloaded. what do your dies resize for, ackley or improved? whats the difference anyway? i thought it was 257 ackley improved.
There are two versions of the 257 Improved. The 257 Ackley with a 40* shoulder and the 257 Improved sometimes refered to the 257 RCBS Improved with a 28* shoulder.