The Late Keith Neal once told me on one of his visits to Purdeys Factory aprox 1959. that he had some of both John & Joseph Mantons Handwritten Gun Orders. I did get to see them some time later, Barrels used the Abbreviation, BBL 2ft 8in.& bbl 2ft 10". What do the Tula Gunmakers use in their Gunshops????cc/dt.