In in all the old british guncatalogs op the the period of WW1, the 10Bore load is with 8drams of blackpowder. The 10 borerifle I have bought at Champlin Firearms shoots with 3.25" brass....Is that the normal length for the 8 dram load??.
In a Holland & Holland catalog(1890) there is a 12Bore doublerifle that can be ordered(back then) with a an extra powerfull 9 dram load....what was the brass length for that one????.