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I'm pretty careful ....and stick to some pretty tight process controls...only one powder on the bench at one time, one size primer, etc ...
On metallic ....I have not had an issue on a cartridge ( with a bad powder drop ) in well over 5 yrs ---and probably 12,000 rds a year ...or more...
But my good luck /error free sucess on metallic - I think, is because I use a Progressive Press - with a "powder check" die adjusted properly and installed in use all the time ! Using presses that require manually indexing, checking cases in a shell block, etc ....add potential human error ---and looking isn't always "seeing" .../ but most any process will fail - if you screw up. A simple thing like leaving a different powder keg on a bench ...when you switch calibers ...is a big no, no ...../and any press can be defeated if you don't stay focused.
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I've had some crimp issues, etc on shotshells ...but not many ...over many, many years....( and I use a progressive press there too ).
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but staying diligent is important ...!
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