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the comparison between 450, 45-70, and 444 has been covered in detail at www.beartoothbullets.com
talk to marshall stanton over there for a guy who is up on his lever guns.
now, as per the original question about recoil, i can say there is a HUGE difference when you start slinging 400 grain bullets around. i owned both a 45-70 and 444, prefer the 444. the 45-70 is not at all bad with 300 grain bullets and a decent recoil pad.