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Can the Case Guage be off?

I am reloading .45 colt with a Dillon 550 and Dillon Dies.  I made a couple of bullets last pm that I most likely over flared.  They fit perfectly into my .45 colt Dillon case guage, but did not fit into the chamber of my Judge revolver.  The bulltets seemed to Crimp OK which I thought should take out the slight over flare that I created.  So why would the bullet fit into the case guage and not my barrel?

what is the outside diameter of the case mouth on a loaded cartridge? Do cases enter the chamber at all?

Well I realized the I under crimped and now it fits my barrel fine; but if it fits the case gauge shouldn't it fit into the weapon as well?

Thanks

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