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Old February 5, 2019, 07:56 AM   #3
Mobuck
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Join Date: February 2, 2010
Posts: 6,847
"Plus, Pmags for 556 doesn't like feeding fat/subsonic 300BLK ammo, too."

In my experiences, this is not an issue. We use 10 round P-Mags for hunting and have not had any problems. Over length seating may cause hangups (with any magazine).
We have a "Harvester" can that is not rated below 10.5" w/subsonic and 16" super. I think they're be overly conservative but not going to risk damage just to find out. I now have a can in ATF jail that is rated for super sonic in a 10.5" as the performance of subsonic hunting ammo is unimpressive.
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