Shooting shotguns painlessly is all about technique. The shooter needs to take an aggressive stance, lean into the gun, attack the target. This is very true for target shotgun shooting, less so for shotgun hunting. I can hear the folks out there saying I've hunted for years and never did that, but you probably shot less than a box of shells a day too.
Seat the butt of the gun firmly into the shoulder "pocket", let the recoil "push" you, not slap or hit you....that is the secret. I used to practice 12ga skeet and it wasn't unusual to shoot 200-300 shells a day. I used a Charles Daly O/U.
Agreed.......but tell that to a young shooter (especially a smaller framed female shooter). There is NO doubt that a semi will help the shooter to absorb the recoil a bit better than an O/U. JMO .....after observing many young shooters try 4H Modified Trap.