I have shot some of the heaviest recoiling rifles in the world, and you are just a wimp.
Just kidding brother. I have a .45-70 trap door Springfield with a steel but plate that is very similar to your rifle. I have a .458 win mag with a good recoil pad. That trapdoor feels 15X worse on my shoulder than the .458 Win mag. The steel butt plates on these type rifles, are in my opinion, pure torture. Anyone who even suggests these rifles are not painful, is more of a man than I am.