Double feeds are usually mag related, not the ammo. It being only "jams on two of my 8 mags." pretty much explains the issue. Look at the lips. Might have gotten bent in a tiny bit. Doesn't take much to make a mag unreliable or to fix it. Needle nosed pliers. Assuming they're steel, of course.
"...going to take them apart and tune them..." Try 'em first.
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