Generally speaking 7.5x55 Swissicon will fit in a 1889 rifle. Not to be fired in those rifles, but should chamber. Many of the other early Swiss rifles (KG 1897, K1893, etc.) I found have tighter chambers than the 1889 and won't chamber those rounds. I would buy a 7.5x55 snap cap and I figure it would work, but I won't guarantee it.