Yes, I have case guages for all my pistol rounds and .223, 30-06. Just gives me a warm fuzzy. However, though the guages are SAMI max spec, you could use the barrel from your glock as a very rough case guage. Glocks are sorta known to have slightly enlarged chambers to insure anything feeds.
I have case gauges in .380, 9mm, .38 Super, .40, 10mm, .45 ACP (set from Midway) and .38spl, .357 Mag, .41 Mag, .44 spl, .44 Mag, .45 LC ( another set from Midway) and individual gauges in .223 and .308.
Every round loaded drops into the gauge. The ammo is either for hunting, competition or potentially SHTF/SD. I want to KNOW it will work.
Using the barrel is just fine if you only shoot out of 1 gun. However, it is not even remotely accurate using a glock barrel. For 10 bucks, they are well worth the money if you shoot out of multiple guns.