Stepped Barrel Proof Marks

[FAL]

Who can tell me what the following barrel proof marks mean exactly?

(crown) \ /
BNP 7.62x51MM 20000 tons mXc
/4\


X = Sword crossing
Found on the stepped barrel in my FN Mauser '98

Thanks!!!!

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[xoddah]

google --- how to read swedish mauser stock disks ---
good info, pictures and everything...

 

[Jamie6.5]

Who can tell me what the following barrel proof marks mean exactly?

(crown) \ /
BNP 7.62x51MM 20000 tons mXc
/4\


Thanks!!!!

Birmingham Nitro Proof. (smokeless powder proofed) to the pressure listed.

British gun makers/builders aren't allowed to rate their barrels/actions for max pressure. They have to be sent out to be "proofed" by a gov't approved proofing house. The mXc is the proof house that rated it.
I think you have an extra zero or two in there though.

http://www.phoenixinvestmentarms.com/archives/Proofmarks.pdf