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it could be how you hold it against your shoulder or bad fit. both my shotguns fit me well and i can shoot multiple boxes of heavy 3' out of either or a case of target loads with no il effect. with proper fit and form you shouldn't be getting any bruising.
Either your gun doesn't fit, or your shooting form is poor, or you are using a shotgun that is unsuitable, as in a lightweight shotgun, or a silly tactical shotgun, that is very light, or has a crappy stock.