F4 is just machine-gun ammo the projectiles are under size, the Fullbore shooters use barrels designed for them groove diameter was .3075" and a 14" twist I have one screwed into a Mauser 98 action...
Type: Posts; User: shooternz
F4 is just machine-gun ammo the projectiles are under size, the Fullbore shooters use barrels designed for them groove diameter was .3075" and a 14" twist I have one screwed into a Mauser 98 action...