"The first test, made when the barrel has been pretreated, is carried out with tripled black powder charge (3.25 Dram x 3 = 9.75?), and fivefold shot load (1 1/4 oz. x 5 = 6.25 oz???)." A possibly translation error?
For comparison, until the 1924 revisions The Banc D'Epreuves Des Armes a Feu De Liege (Proof House for Firearms of Liege) First Obligatory Proof Load for 12g breech plugged tubes intended for “Double-Barreled Breech-Loading Sporting Guns” was 21 grams = 324 grains = 11.8 Drams powder and 32 grams = 1.12 oz. shot
British Provisional Proof (tube bored, ground, and with chamber cut and threaded for a plug) 1855-1925 for 2 1/2” and 2 5/8” 12 gauge shells for a service load of 3 1/4 Dram Eq. with 1 1/4 oz. shot was 9 3/4 Dram “T.P.” (Tower Proof “R.F.G. 2”) No. 4 or No. 5 Black Powder with 1 1/4 oz. shot.
