Bad headspace

It's rare in a factory rifle...

Bolt closes easily on a steel no go gauge or if it closes on a field gauge.

Bolt closes but the extractor does not engage the case head.
Misfires for no apparent reason.
Case head separation on firing.
 
OP, Guntech is telling you what to look for, with the very limited information you've given him, it's good info.

You don't mention wether your ammo is factory or hand loaded and even more important, you don't mention the type of firearm.

More information would go a long way to answering your question.
 
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