.577 Nitro

I have a .577 Nitro 2¾"
One can see a N stamped on the upper side of the case.
Any comments would be much appreciated

577 N - Headstamp 577 N


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Not seen this before, but some few military example have stamps in the case at the mouth. Usually much smaller and with a series of numbers.

This is not a Nitro load with a lead bullet. With the relatively late nitro headstamp & this lead bullet it should be a Nitro for Black load, and an odd one at that. BUT perhaps a collector or shooter marked it, for some personal reason? Nicely done, but no idea why. Sorry.

The “N” could be a “Z” ?