IF it proves to be a 'small ring' Mauser (meaning a pre-1898) then one should exercise a bit of care.
The original rebarrelling is rumored to have actually been into 7.62 CETME which has a lower pressure than 7.62.51 Nato (which has a lower pressure than .308 Winchester.) I should note that there is a LOT of controversy about that, with just about many people stating that the rebarrelling was into NATO, not CETME.
A small ring will probably survive on a steady diet of 7.62 NATO (for which there are commercial offering). Many people recommend NOT, I say again NOT shooting .308 Winchester from small ring Mausers. Mauser Central posting on someone who may have either had a hot loaded .308 or a spiked round of ammunition.
That's pretty much what I have gleaned from all the controversy as well.
I use Nato spec in my FR-8 without worries, but I thought it better to present all sides so no one gets surprised when someone does the :shock: :shock: :shock: because of a small-ring Mauser.
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