The 6.5x53R (AKA 256 Mannlicher) was quite widely used in SS Falling Block rifles although it is rare to find examples remaining today, as most have been re-bored to something a little bigger as the 256 Mannlicher case was one of the first smokeless powder rounds, and used corrosive primers so the original bore was cactus, the usual story.
Matt.
-------------------- There is nothing wrong with vegetarian food, so long as there is meat with it.