I used to have an SSK mold for my 41mag listed at 275gr lino. It was from NEI and my alloy went 283gr. It was a hammer and I gave some to a pal for his 40-60Marlin, and now he has the mold! Google NEI and it will give you the website and they have a chart of molds with profiles. HTH
Seriously think I'd rather have a 225-240gr mold, after 28 years with the 41Mag. JMHO
Regards,
Sweetwater