I shoot some stout (100 grains of FFFg T7 with a 58 cal 550 grain (1 1/4 oz) conical @1350 fps or 110 gr of FFFg T7 with a 54 cal 485gr (1 1/8oz) conical 1550fps both in 6lb 10oz guns), but not unreasonable loads, in my Thumper Carbines and invariably get one or two comments like "you are going to shoot your shoulder into a taco" or "does that load spin you around".
A couple of things are going on...either those that comment are super sensitive to recoil or may have never shot a load like that and are talking out of their anal orifice, or are using the upper arm gun butt placement style of shooting, or have a very poor fitting gun and have poor stock placement because of it.
Having done some calculations and shot these loads, most all of them are far less than the standard 1 3/8 oz "goose load" with modern ammo in like weight guns and the recoil, while uncomfortable off of a bench, in normal hunting stances...(kneeling, sitting, standing) are plenty manageable and not noticeable when hunting.
@SOLANCO hits the nail on the head in his comments....poor gun fit, poor stock placement on the body (or upper arm mount) and generally poor shooting practices fail to mitigate what would normally be acceptable recoil.
a 1 1/4 oz , 3.5 dram load is equal to 547 grains @ 1300 fps
See chart below
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