Satisfied with the success of my 50/300 endeaver, I need another project and I want to use the 375H&H or 458 Win with black powder and the cartridge. This will be nothing but a paper puncher and maybe use it to hunt sometime. I have no expectations but to pull a trigger and enjoy the boom and smoke. Which round would be easiest, I assume 458 winny. Appreciate your expertise for my projects caliber choice.