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Old December 4, 2009, 11:01 PM   #6
Senior Member
Join Date: June 23, 2009
Location: Wisconsin
Posts: 228
"Don't the Glocks have a polygonal rifling or something like that. Could that make such a difference?"

Ah, now we're closing in on it, methinks.

Yes, there are some Glock barrels that apparently don't respond well to lead rounds (and polymer-coated count), with the polygonal rifling. Good catch!

OP: Try comparing the two again, this time w/ FMJ rounds and see what happens.
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