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Buying used cases can be a problem, not only with the function but with safety. Buying used Military cases can be very risky, especially if these cases were fired in a Machined Gun. I don't know if cases fired in a Machine gun can be spotted with out the aid of a case head space gauge of some sort. As one Member has stated, don't buy any cases that have been prepped, that is excellent advise.

Case separation, the once in awhile separation, does not worry me, frequent separation can Ring the Chamber, [not likely in a chrome chamber] , a ringed chamber can be a big problem.

It seems like once a week this subject comes up on the Forum, " Chamber headspace vs Case headspace". All M1A and M1 shooters should understand the relationship between these two before attempting to reload. To understand this relationship numbers are required, knowing what to do with those numbers is one of the Keys to quality reloading..

This has been said but needs repeating:" Don't buy or consider using any used cases that have had the original Primer removed"... Invest in a case head space gauge, know your chamber Headspace.. Art
 

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Useless information:

You could tell M60 cases because the ejector mark was square, whereas the M14 is round (and often smeared by the rotation of the bolt). Not sure about the newer M240.

M14 cases will also have the ding from the operating rod. If there is no ding, it was probably fired in something else. You can often count how many times it's been fired in an M14 by the number of dings in the case body.

Bolt actions don't usually leave an ejector mark.
 
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