I've never shot ~any~ load in a pump 12 gauge that I would consider useable with a "fragile" shoulder.

Do some research on shotguns and I think you'll find they are a special purpose weapon with a narrow mission. Low light, moving target scenarios are where the shotgun excells. Beyond that, you're better off with a good carbine. Your shoulder would like an AR much, much better than a pump 12 gauge.

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