Dang! I've got an EAA Bounty Hunter II 12ga and MY arm never looked like that! Of course, like Big Hext mentioned, I've only shot the Winchester "Low Noise/Low Recoil" loads in it.
By the way, looks like you may not have been holding it correctly to your shoulder to get so much bruising on the bicep. That may have a noticible impact (no pun intended) on your propensity for bruising!
Doug (Lowgrade Orr) 444
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