Hey guys,

I have a S&W 657 in 41 Rem Magnum and a Marlin 1894c in 357mag that I have started casting bullets for. I was wondering how fast can I push these bullets before I have leading issues? When do I need to use gas checks. I have noticed that so far(limited experimentation) the 41mag likes jacketed bullets above 1450 for decent groups. I have not shot any cast bullets yet. I am hopeing to use both to hunt with useing the cast bullets.

I am useing straight wheel weights for the bullets.

Any help would be much appreciated.

Thanks
Nick