Hey there TCV15,
The tip on the paper clip is a good one, and one i have used for years.
Do I read between the lines that you may be new to the reloading game?
If so, we can give you a few tips on the cause of rapid - low number of times fired - separations.
Potential head separations are not uncommon with oft reloaded cases, and the paper clip probe makes it easy to know when it is time for a batch of new cases.
AS a side light, case wear is one of the best reasons to keep track of "number of times fired" for all your rifle brass.
When you find a potential case head seperation in one case, it is very likely the rest of that batch of brass is also due for replacement.
Stay safe and keep em coming!