I have reamed hundreds sorry thats the wrong description de burred hundreds of GGG cases in 308/7.62 over the years and never had a problem I suspect you are cutting the the primer pocket deeper than it should be.
I use a LE.Wilson trimmer with a LE.Wilson primer pocket trimmer with out any issues. If you are binning the cases I would take them of your hands. But before you atempt to remove the crimp.
Just a word of caution regarding nato 7.62 brass.
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All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
Re: Just a word of caution regarding nato 7.62 brass.
You do not need to ream the primer pockets you just need to remove the crimp. It takes no time at all.
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ukrifleman
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Re: Just a word of caution regarding nato 7.62 brass.
Re: Just a word of caution regarding nato 7.62 brass.
One thing it's worth pointing out is that the primers actually moved back to just proud of the case head by a midges dick, but they all went bang.
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dromia
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Re: Just a word of caution regarding nato 7.62 brass.
Primer movement is common in low or no (as in this case) pressure firings.
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Itsfatty
Re: Just a word of caution regarding nato 7.62 brass.
I’ve tried removing the crimp on GGG 7.62 and 5.56 with both a chamfering tool and an actual proper RCBS primer swager tool and although both are quick and easy and both get the job done I prefer the chamfering method, only thing I will say is that the proper tool is more consistent, I did find seating primers a little harder though
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