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As per usual, Rocky is right about the rifling in the stock barrel. Most of us involved in the competitive sports use double struck Copper Plated bullets. Again, most Glunk shooters have gone to the Barsto Barrels.
Also, I did a little experimenting with my Glock 22 and other 40 S&W chambered pistols I have with supported chambers. Shooting the same batch of new factory loads and measuring with calipers at the web, you will find a noticeable difference in the expansion at this area of the case when it comes out of the Glunk when compared to the other guns.
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