Some rifles and cartridge combos just plain hurt. I have unbraked, lightweight, 300RUM, 338 RCM, and 375 Ruger. I can shoot the 300 and 375 all day. And the 300RUM is sending 225+ grain downrange with 101.0 grains of powder. So a pretty stout load. 375 is shooting 350 grain bullets at just about 2600fps. And the 338 with 265's at 2550 fps. So not crazy recoil, but quite a bit in my unbraked RUM that weights 7.5lbs..Yeah it should have been a 6" gong not 3". The 3" is for shooting with support or scope.
It really doesn't cause any pain at all. A lightweight 12g recoils harder then it. I get it, you don't like recoil and can't imagine someone else not minding it or enjoying it. Just relax and shoot don't worry so much about a little thump. Just make sure you hold it properly, that was a learning curve
But yet, my most unfavorite rifle, that absolutely murders a guy, is a lightweight 7mm WSM. With any load. Doesn't have nearly the same recoil, but the speed of that recoil coming at you, with the shape of the stock, crappy buttpad, just plain hurts. I can literally only shoot 5 good shots. Then my groups will start to open up. I recently swapped buttpads and it's night and day different.