metal foil

[ken s]

This will only expand the bullet on opposite sides.
How much larger do you have to go?
What alloy are you using?
What temp are you casting at?
Alum foil works well here.......
Gary

I've done this before. I use only ONE thickness on one side of the mold. yes,inside.
If you keep the lead at 700, you will get no leakage.
I've found that this really does not effect anything, and is a cheap way to try a little larger PP bullet.
Ken