I bought a couple boxes of 500 each, cast bullets for my 41 mag. and also my 357 mag. The thing is they don't say what they are other then wt. and swc on them. I am sure they are Keith style bullets but how do I know for sure and also how do I know for sure how far to load them and what load I should use with them? I have loaded for about 40 years and have never loaded cast bullets so I just am not sure about them.