It's been my experience and the ballistics will tell also that the faster & lighter bullet of the .444 shoots flatter farther than the heavier 45\70. Both will stop a train though. The Marlin .444SS has a longer barrel than the outfitter model. The .444 is a great round out to 200 yards but if your looking for a big bore, then range isn't your primary reason for buying a rifle. Either rifle has impressive knockdown power. It's personal preference, kinda like between Ford and Chevy..... This didn't help a bit did it?

"Fast is fine, but accurate is final". "Wild Bill" Hickok - 1869