Yup the old Remington wood can be pretty, but on the old BDL's they came with butt plates.
The magnums had recoil pads (so did 1100 magnum shotguns).
Even the old style rubber pads helped quite a bit, but the latest stuff is even softer.
But for cost savings I'd just get a used factory cheap Remington synthethic stock with old style pad. By the time you get a decent recoil pad and cut the wood stock.........it's more time and or $ (if you have a good stock guy do it).
I've done several, takes me a while as I don't have the jig. Results are fine..............but not everybody does a good job.
Old and cranky, less hassle in my opinion, to just swap the whole stock. And if you do that, you have the original for any sentimental value.
After that, shoot 180's and lighter and it should be pleasant. The more you shoot the less it will seem to kick too. My buddy had a .300 winmag, previously just a varmint rifle guy.
After a summer of load development and practice he thinks it a p*ssycat.
While barrel porting methods work, I'd steer clear of that. Stuff is loud enough already. Do everything you can to preserve your hearing. Even when hunting.
Tinnitus sucks, really bad too.