My favourite Single Shot is a Colt Sharps in .30/06 but the Browning 1885 in .223 is a great handling and accurate rifle also but the question of best cartridge for a Single Shot depends on personal preference .It could be a Martini Cadet in .22 LR or a Dakota in .300H&H . My project rifle of the future would be a Ruger No. 1 made in early Farquason style in .470 NE and one in .303 Brit. I have noticed Ruger have bought out a .405 Win. in the No. 1 and this would be a interesting rifle . Thanks
RLI