As I mentioned, make sure you slug the bore.

There is some confusion as to the actual bore/groove depths of these rifles. Smith and Smith cite the nominal groove depth of both the 8mm 1893 and the M30 CARTRIDGES as ".323".

However, the 1888-90 and 1895 rifles/carbines and the 1890 carbine are cited as possessing .329 diameter groove depths. This is the situation with the converted rifles owned by my friends. As 88Mauser says, groove depth appears deeper with the M30, but according to S&S, so is the groove depth of the 1890 rifles. I have also read of M1890's being bigger than .323, also, so the slugging is essential.

Also make sure there is adequate case neck relief if you decide to shoot groove diameter bullets.

Groove depths in excess of bullet diameter were common in some Euro military and commercial rifles manufactured before WW2.