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I dont have a Stag-10, but i've fired Hirtenberger through many different guns and its fine. I suspect its slightly low pressure, but I can't imagine a Stag would have problem with it.
My family had a shoot a while back ran it through an 700, a T3ls and a M-14. Shot nice, primers are crimped in but didn’t have an issue popping the primers.
It runs fine through my Stag. I've run it through both the oem 18.75" barrel and a Faxon 20" Gunner barrel. Goes bang every time, and the reloadable stuff is a bargain when you consider the cost of brass.