800X is a lot better in 10. You end up with a full case before you get the velocity with most 40 loads. 800X will make a 10 SIZZLE for sure!!! Clark had some real screamers with 800X in small cases but if I remember right he was double compressing to get enough in the cases LOL.
You will KNOW Glock cases instantly by looking at the primer, Glock brass has a rectangular mark and a 'wipe' mark in that rectangle. Very distinctive primers. You probably feel a little more resistance in the size die too when running them.
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