You do not want to shoot pure lead in anything over 700-800 fps. For rifles you will need 2 things, Linotype and a gas check bullet. Anything less WILL cause you problems. Linotype is lead with tin and antimony added. It is very hard and very expensive in comparison to soft lead or wheel weights (lead and tin only).
There are bullet molds that are made for just a project. 120-130 gr. pointed w/gas check.