You can view Belgian proof marks here:
http://damascus-barrels.com/Belgian_All_Proofmarks.htmlThere is so much more to the nitro proof issue, see mark #19. There was another mark indicating a 4th proof, see #15. Also, if the barrel weight was stamped on the barrels it had passed nitro proof, see #16.
Raimey is correct about the Germans forcing the proof pressures higher.
In 1912 the Brussels Convention set a minimum proof of 12,000 psi for Nitro proof. Only T Powder could reliably meet this standard. The proof and service loads did not change in France until 1928. In France, in 1901 ordinary proof was rated at 14,200 ps, double proof at 20,500 psi and triple proof at 27,000 psi. These are not service loads! Later, 1928, the proof loads were actually decreased in pressure.
Passing nitro proof in 1906 does
NOT mean the gun can handle modern smokeless loads. We are talking about a 100 year gun. The gun should be examined by a gunsmith who is familiar with old sxs. The barrels need to be measured at several points for wall thickness. Finally, it is best to be mindful of recoil and use appropriate loads.
Honestly, people have been very helpful with very little information. Pictures are really needed.
Pete
