I have to add that you could also use these in a C96 7.63x25 Mauser. I never have though so I have no data for such. Get creative and experimen. 30-40 Krag, 30 carbine, 300BO (which seems silly to me, but hey what ever ) basically any 30 caliber rifle or pistol round.
Same goes for 303 British although I suspect even though the bullet diameter required is .312 vs a .308 I would speculate the polymer sabot might would do one of two things. Either expand enough to catch the rifling or if gas cutting does occur, could possibly cause squibs or catastrophic failure.