Miller: Be careful with your weight abbreviations. The abbreviation for grams is g. The abbreviation for grains is gr. There are 15.4gr in 1g.
Tom;
It seems the Suhl proof stamper in 1907 wasn't aware of that. My bbls are stamped 2 gr Sch.P. / 28,3 gr Bl.
These grs are obviously Grams in both cases & not Grains. I was just stating how this gun was marked, no more no less.
The / is not on the gun, just indicates what follows is on a different line beneath the other. I always carry the conversion to two decimal places & call it 15.43 grs per g. 15.43 x 28.3 = 436.669 grains which is mighty close to an ounce @ 437.5 grs. I normally call an oz 28.35 gs which times the 15.43 grs gives 437.44 grs which is close enough for a Red Neck HillBilly for use in a shotgun.