Bucksix, your "new" 8x57 S&S rifle looks like another rare pre- 98 transitional action. Does it cock on closing or on opening? A photo of the gas ports in the bolt? Are there low Mauser commercial serial numbers under receiver ring and on rear of magazine box? It seems to be restocked recently by another, definitely not Sauer & Sohn.
On the proprietary S&S inline claw mount, a page from Jim Cate’s “J.P. Sauer & Sohn” book: