I use a case gague all the time / I buy mine from Dillon.
I pick up a lot of brass at indoor ranges (stuff comes out of Glock police guns, rental guns, etc ..) / and the last check I do, as I box rounds up - is run them thru a case gage. If they drop in and out easily - then they get boxed up. If they don't - I look for a crack that I missed in my initial inspection or a burr on the case edge or something / pull the bullet and reclaim components and toss the case.
To me, using a case gague, is an important last step in ensuring you have quality ammo that will feed in your gun reliably 100% of the time. I don't want to wonder about feeding issues - in a match ....
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