"Trapdoor" Model 1884 Springfield, made in 1889--but plan to hunt soon with another trapdoor, an 1866 first-year Allin conversion, which shoots just as well.
Since several have mentioned shotguns, rather than rifle, the oldest shotgun have hunted with is a W.W. Greener side-by-side 12-gauge boxlock ejector, with Damascus barrels, made in 1895. Killed my first pheasant with it over a month ago.
