There we agree on that and a bottle necked big bore at that.
Ever shoot any of the .50BMG rifles?
I've shot 6 different ones. And in 3 cases prototypes where I kind of felt like a "crash test dummy". Especially shooting one from prone without a muzzle brake and the "recoil pad" was, accent on "was", about 2-1/2" of cardboard that got compressed into the shape of my shoulder. I think I also got pushed back close to an inch along the ground.
The most fun and interesting one was the bull pup one that could be fired from a standing position that balance on my shoulder. The stock profile and weight/balance would cause it to roll up in recoil and then back down.