Casting rifle bullets from pistol lead

[Super Scout]

Having a 358 winchester built. I have piles of 357 magnum cast pistol lead.
Some are lubed 158 grain SWC the other batch is swagged 148 gr HBWC. I'm assuming both are pure lead and need to be hardend to be put through a rifle. Any suggestions what to use and is there a calculation or ratio of lead to hardening agent to make it suitable for rifle firing?

 

[grouch]

I'd try adding +/- 5% tin if the alloy is soft or +/- 2% tin if it's hard after dropping the bullets from the mold into a container of water and aging for 2 weeks.

The tin makes the lead fill the mold better and results in better(more uniform) bullets.

It's not always necessary to have hard bullets to get good results in a rifle.

Good luck.

 

[John Y Cannuck]

It wouldn't take a lot of wheel wieghts to make the mix hard enough. How much would only be a guess on my part. I shoot straight wheel weights most of the time.

 

[blindside]

pure lead is best left for pistol,muzzle loader,and barrel/chamber slugging..No tin,no antimony,no rifle