Plus 1 for RSW.
30 years ago i shot a pile of 44mag every week. still have enough stuff to last me most of my life. plus i can load to hot 44spl/low44mag, and thats all i need. 458 win mag because at 5-10 bucks a pop it dont take long to burn though a hours pay. on the other hand if ya can go through a couple hours pay in one sitting your a better man than i am. 45-70 because its a original trapdoor and get just my cast bullets with black powder, no smokeless powder loads for that thank you. i know that dont make any sense but thats the way i feel. every thing else i dont shoot enough or just isn't worth the effort.