I was looking around in Cartridges of the World and saw a European number called the 9.5x57. Seems to be a mauser case opened up to 375. Is such a round actually in use today? I'd imagine that with light bullets like the 225 gn Hornady, this number would be quite the woods gun in a short rifle.

I dont think many uses 9,5*57 but 9,3*57
are a good moose round here in sweden.
Norma makes factory ammo. in 15g (vulkan) and 18,5g (Alaska)

The 9.5x57 is Mannlicher-Schoenauer cartridge developed for the 1910 rifle and carbine. It is a fine cartridge for anything shy of large, dangerous game.
Ammunition is available from http://www.snowcrest.net/oldwest/ using reformed brass. Original ballistics equal the .358 Winchester. Modern loadings can go a bit hotter using lighter bullets. This site http://www.african-hunter.com/site/classcart/375hhmag_01.htm tell the history and shows a comparison.

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It is not very popular and very rare

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I�m not sure, but components should be easy:

.375 bullets are plentiful. Cases once fireformed will last long. Dies might be a problem, I would check RCBS first.

May I suggest other proven ideas: 9.3x62 ( yes, also slightly larger than standard Mauser case, but will require no action work ), 8x68S ( eventually only rechamber, use sturdy bullets only because of twist rate ), 9.3x64 Brenneke and .376 Steyr. The last two use same case size.

Have fun! Hermann

There are usually about a half dozen 1910 Mannlichers and a couple of Amberg mausers on the market in 9.5x57. Last year I had four of them. Old Western Scrounger has dies and factory loads in reformed brass. Kynoch still loads it as the .375 NE Rimless, although their cases seem a bit undersized for most chambers.

The 9,5x57 uses the same basic case as the 8, 9 and 9,3x57, the primary difference being the diameter at the shoulder is increased in the 9,5. My 9,5 likes cases made out of Winchester 8x57 brass just fine. It makes a good woods cartridge for pretty much anything in the US with a 270 gr bullet handloaded to 2300 or so, but I wouldn't go out of my way to have one built. Those MS 1910 carbines are classy little guns, though!