My 300 Win Mag rifle came with a built in recoil pad and when I got it, it had (and still has) a slip on recoil pad on top of that. For sighting in I have a home-made shoulder pad my wife made for me made out of a piece of blue sleeping pad foam in a form-fitting pouch made of T-short material I strap on.
When hunting the two pads on the rifle are adequate for the one or two shots required.