It ran 50 yards and died, sounds like it did its job. Doesnt matter what you hit the critter with, sometimes they wont go without a fight. Personally, I stuff my 45/70 marlin with my own reloads, 350gr FP Hornadys in starline brass, WLR primers, and about 45gr of RL7. Thats under max. It kicks like a mule though. Lighter loads with that bullet will still perform great. I, myself, prefer the entry and exit hole strategy. Two holes to bleed out is better then one. A 45/70, since it goes rather slow, doesnt do alot of hydroshock damage as say, an '06 would. Its going thru like a cookie cutter, carving a hole over half an inch around all the way thru the animal. The meat damage around the bullet holes will be evidence of such. Cut a clean hole thru the animal, even if you miss the heart, its gonna bleed like a stuck pig. Now, take a 300RUM, at the same ranges as a 45/70 will shoot a deer at, and look at the damage around one of those holes. Little more meat loss there lol

I should add, I chose the hornady bullet over the remington bullets, after reading alot of negative reports on bullet failure, for both of their bullet weights. I know, its the internet, but plenty of pics to go with it, makes you pay attention. The ultimate 45/70 bullet, would be one from swift, pricey, but picture perfect mushrooms.