You say you "like casting and shooting lead bullets". So, if you want something to cast for, I would like to suggest the .400H&H. It uses the same bullets that the .405 Winchester and .450-400 use. It achieves good velocity without violent recoil. And you can run everything through it from Woodleigh solids to gas checked lead, to paper-patched. It is easy to load for and works well with just about anything one can stuff into it. Additionally, you can fire-form brass from .300H&H. It is a fantastic round.

Left: 300H&H, 375H&H, 400H&H with 300gr and 400gr bullets and a 430gr paper-patched lead.
Right: Factory loaded 400H&H and a case fire-formed from .300H&H.