When I was tooling up for my Dillon 550B, I bought the case gauge. Therein began my troubles. Some of my rounds were too tight to go easily in/out of the gauge, so adjustments were made to taper crimp die so they would. Big mistake. now my rounds wouldnt even headspace on the case mouth,(they were going too deep in chamber), Failures to fire, (primers too far forward in chamber to be ignighted), and hellish extraction of dud rounds stuck in chamber/rifling. It seems that the case gauges are manufactured to Minumum SAMMI specs, and Colts and Glocks are considerably looser in specs, (to be combat reliable).
Solution? Threw the case gauge out in the alley, started using my barrels as gauges and problems disappeared, reliability reappeared!
Another thing, dont taper crimp your 45's unless you absolutly have too, Minumum belling of the case mouth, seat your bullets, (A few), measure the OAL and record, then cycle them thru your pistol by hand, (vigerously), then recheck your OAL. If any of them come out shorter, you may need minumum taper crimp, so bullet set back does not occur, which could raise pressures.
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"Always place your clothes and weapons where you can find them in the dark"
Lazarus Long