Looking to learn something. Is 13 BnH considered hard enough for .357mag? What is the rule of thumb for hardness by caliber? For example, you can use up to X BnH up to Y calliber, etc.
ETA: Thinking more about this, isn't it really the make up of the alloy that's important as well as hardness? That is, I would assume you could theoretically have two different bullets with the same hardness, but one could be more brittle than the other because of alloy composition. Am I way off base here? So I guess the right question is what hardness and alloy composition are the best within various caliber ranges?