Yes, here it is
Hit and Miss in Experts on Guns and Shooting, G.T. Teasdale-Buckell, 1900
http://books.google.com/books?id=4xRmHkr7Lp8C https://books.google.com/books?id=4xRmHkr7Lp8C&pg=PA175&source Lord Walsingham himself recollected: On August 30, when I killed 1,070 grouse to my own gun in the day, I shot with four breechloaders. No.1, a gun made in 1866 by Purdey, subsequently converted from pin-fire to central principle, to which new barrels were made last year. Nos.2 and 3, a pair of central fire breechloaders, made also by Purdey, about 1870, for which I have likewise had new barrels.
No.4, a new gun made by Purdey this year to match the two mentioned above, but with Whitworth steel instead of Damascus barrels. The guns are all 12 bore, with cylinder 30 in. barrels, not choked.
My cartridges were loaded by Johnson, of Swaffham; those used in the down-wind drives containing 3 1/8 drs. Halls Field B powder to 1 1/8ozs. No. 5 Derby shot; those used in the up-wind drives (where the birds, of course, came slower) had 3 drs. only of the same powder, with the same shot; not hardened shot in either case.
I find I never go out shooting without learning something. If I had the day again, I should cut off the extra eighth of an ounce of shot, not on account of recoil or discomfort of kind from which I never suffer, although always using black powder but because I failed to get as much penetration at long distances as I do with an ounce only. I distinctly remember firing three barrels at one bird, striking well in the body every time, but killing dead only with the last shot; the powder seemed to burn too slow.
Another thing I learned was that Whitworth steel barrels are not desirable for a heavy days shooting. The explosion in them makes quite a different sound from that given off by Damascus barrels: there is more ring about it, and I can imagine that this might prove a serious annoyance to anyone who minds the noise of shooting. I have no recollection myself of ever having had a headache from gun-firing. Moreover, the Whitworth barrels become hot much more rapidly than the Damascus; and this is a serious drawback, especially to a man who shoots without gloves. I can well imagine that they last much longer, and are in many ways suited for ordinary light work; but am now replacing them with Damascus, as in all my other guns.
The 1880 date came from David Trevallion. Walsingham's 1870 Purdey would be 4 years before Whitworth patented the process.
