Mark/number all of your magazines so that you can ensure that it really is just the one type of ammo.
If you can take the same magazine, as verified by numbering, and get a DF with the GA ammo but feed fine with known quality ammo, and can get a DF in multiple magazines with the GA but feed fine with known quality ammo, then I'm stumped.
Sometimes it's just bad juju. I'm sure there's a scientific/mechanical/chemical/otherwise logical and rational explanation, but I really can't think of a reason for the type of double you describe that would be ammo related.
Just think about what's happening. I'm assuming she's able to chamber and fire the first round just fine, and it's the second (or subsequent) round that's causing the double. In that case you're getting two bullets looking for the same hole. The only way for that to happen is for two bullets to be getting stripped out of the magazine.
Now go look at a loaded good condition magazine. How the hell do you get two rounds out of that badboy at one time?
When you say "US GI 30 and 20 round types", we're not talking surplus are we? We're talking magazines from D&H or similar that you bought NIW, right?
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