Remove the barrel, drop a round into the chamber. If it goes in to the right depth then your round should fire and cycle properly. If things aren't over-size it just "plunks" into the chamber. If it hangs up then there is a size or possibly bullet profile issue with that round in that chamber.Pray tell,,,
For us non-reloaders,,,
What in the heck is a "plunk test"?
Aarond
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If it drops in too far check the caliber you may have tested a .380 in 9mm or similar...