As to the 25# bags of shot; I recently picked up a plastic bottle of #5 shot at Cabelas in Post Falls, Id. It's a Knight product and is 3.5lbs net weight. I forgot the price, but it will undoubted last me the rest of my natural life unless I get inundated with pests. I use it in my 41mag and 45Colt in both the short (normal) version and the long version as Stimpy guided you to the link. No capsules available for the 41mag so I use the gascheck method for all of them. The long version is a bit tedious, but when I build them, I have nothing but time. Enjoy! They are a blast!
Regards,
Sweetwater