Hello. New to casting and fairly new to handliading itself. What finally convinced me to start casting was this 1918 Carcano Troop Special. Favorite rifle I've had, mostly due to how light and handy it is. The bore is good but my issue is the groove to groove diameter measures .270" after slugging. It is my understanding that a .271" bullet would be optimal, correct? If I have a sizer made, can I size down a .277" cast bullet meant for a .270 Winchester? If so, what has checks would I use? I am also considering buying a mold from Midsouth Shooters for the 6.5 Swede that drops a .268" bullet, having the mold machined so it drops one over .271" and then resizing the bullet to .271". Also, how to go about enlarging the neck from .264" to .271"? Would a standard Lee 6.5 Carcano bullet seating die and full length case sizing die work?