I have a 30-40, a Lone Star rolling block. It's now my only "high power" rifle cartridge, although I load it down to the original sporting rifle specs of a 220 gn RN at 2000 fps from my 30" barrel. I've never hunted with it. I'm moving towards pistol length rifle cartridges, and when my jars of 4895 empty, I'll likely sell the rifle. Time will tell.
