I agree with Stan here. A persons weight has little to do with it.An older neighbor of mine had an old 12ga 30" single barrel "Hardware brand, don't recall the exact name. Once several of his daughters & families were vising him. I had been invited down also. We got that old single out & shot it a bit.
I was around 16 at the time & weighed around 150 lbs. One of his Grandsons was around 13 & weighed about 99 Soaking wet if he was wearing heavy clothes . Neither of us had any problem shooting it. One of his Son-in-laws was there & probably weighed at least 200 & was Not Fat. He was a big city mail carrier in the days when they walked a beat with that big leather pouch slung on their shoulder & was solid as a Brick. He fired that old 12 one shot & said he won't shoot it again for $100.00, it kicked him so bad,
Go figure.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra