I am a new member and also new to reloading. I have been a machinist for 35 years. I would like to dabble in casting some bullets. Most bullet molds seem to sold out right now. I have a cnc mill and also a tool and cutter grinder to make the tooling. I would like to make the tool and use circular interpolation to machine the mold. I would also like to ad a 5 sided pin to make hollow point bullets. my question is how much oversize does the mold need to be to make the bullet the proper size? I assume the bullet will shrink a slight amount after casting when it cools. I would also like to powder coat the bullets.