jimrbto
Member
While going through my safe today I came across the original proof of proof card that came with an 1851 Navy Colt I bought in Germany back in '59, try as I might I cannot find this formula anywhere except for a concrete peneteration meter. As stated on the card the gun was proofed at "620 Kgr/cmq". I have seen a lot of formulas in my day but never this one. The "cmq" is the part I have never seen before.
Any ideas?
Any ideas?