I have been thinking about recoil recently too. I have been shooting for many years now, started when I was about 10 with my cousins 16 gauge. That gun used to literaly knock me back a few steps when I touched it off, i was only about 75 pounds. Than I got a 20 gauge for christmas, i could shoot that just fine. I used to go through about 50-100 rounds a weekend (i had a lee load all). When I was 12 i got a pretty sweet SMLE .303 brit. (which i chopped up and sporterized, yes i was young). Used to shoot TON"S of surplus through that, had the brass butt plate. I got a 12 gauge, 25-06, .375h&h, .270, shot them all no problem. WELLLLLL ...... now i am older and about 165 pounds, and holy geezus they pound the heck out of me. 12 gauge leaves bruse on my sholder. i have no idea how i ever shot that 20 ga single shot. .303 hurts after 15 shots. Will not ever shoot .375 again. but the 270 is fine, i can shoot that all day. i have come to the conclusion that when i was smaller, shorter and lighter the gun moved with recoil and so did I. now i am taller heavier and bigger, the gun does not move, I do not move, but the gun compresses my nerves, bones, and blood vessels. I don't flinch, and i still shoot, but i limit my shooting of the ones that hurt me.