There is such a thing as to much gun. You just experienced yours. When you buy a firearm in hopes to enjoy it. And it actually punishes its shooter shot after shot. It makes no sense in keeping it. Even an occasional black & blue shoulder could lead to other/more serious torso ailments and specifically shoulder damage over time. Playing with bullet weighs may help or may just prolong the agony in your ambition to shoot it without suffering shoulder bruising. {Simple cure-all.} Buy another weapon that's more tolerable too your shooting shoulder.
S/S
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