Several folks have bought the 51-450M mold, right, sounds like.
If you size the bullet to fit the bore, why not buy the 51-450M1?
Just wondering why there is no chatter about the 450M1?
My largest bore is a .502, so a .503 -0+2 would be my choice in a 450M1.
Shooting soft lead and going to get so 40-1 for hunting in my 1-28 twist.