Griffin & Howe (from USA) has made at least one K-actioned custom Mauser in caliber .300 Savage.

.250/3000 aka .250 Savage was one of the original calibers offered for K-actions and it was available in European market as well.
There is one Model M sporter in Mannerheim museum Helsinki. I believe he bought it either from Austria or Germany(?).

From left to right Johann Peterlongo custom M98 9x71 Peterlongo, Rigbys magnum M98 .350 Rigby, Sako/Mosin sporter, Swedish M96, caucasian hunting rifle, Mauser M sporter .250/3000, pair of William Powell shotguns and Purdey double rifle .400 Purdey Light Nitro.