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well if your goin fast twist in a high intensity cartridge, go at least 4 grooves, I know a 3 groove 7 twist .257 barrel will rip the jackets off of 115 and 100 gr BT's launched at 3750 and 3900 fps. less bearing surface on the bullet equals more speed but hard on tender bullets.RR
well if your goin fast twist in a high intensity cartridge, go at least 4 grooves, I know a 3 groove 7 twist .257 barrel will rip the jackets off of 115 and 100 gr BT's launched at 3750 and 3900 fps. less bearing surface on the bullet equals more speed but hard on tender bullets.
RR
