Update: Barrels now resoldered and test shots fired. Gunsmith is suggesting 400gn bullets, presumably to get it regulating via more 'boot', but the originals appear to be only 270 gn to a maximum 365gn. With 110gn BP, presumably with a lot more kick than modern BP, that suggests 1800 fps might be maximum. Bit concerned he may overload it, as he says he is regulating a .500 Nitro also. I feel being an older BP proved gun, better to go a near original load and go the hard road of re-wedging and re-soldering. I gave him a free hand but now my book-reading is contradicting it, I am not sure if I should shut up or not.