Here's the barrel twists of various rifles. Unfortunately, the Mauser's twist in .30/06 isn't in the list. However, note that other European-made rifles ARE in the list which may give you some clue as to what the twist is in your rifle's barrel. I've highlighted (bold-faced) those rifles that I'm SURE are foreign-made.
Other rifles in the list may be foreign-made and I simply don't know it.
30-06 - 1 in 10" Twist:
Browning 81 BLR, BAR Mark II, A-Bolt II; Colt,
FN; High Standard; J.C. Higgins 50, 51, 51-L;
Harrington & Richardson 300;
Mannlicher
Schoenauer; Marlin; Musketeer; Remington
721, 760, 740, 742, 725, 700, 40-XB, 7400,
7600; Savage 110, 114, 116 (present);
Sako;
Schultz & Larsen; Stevens 110; Winchester 70,
670, 770;
Weatherby Vanguard (the barrel
and action still manufactured by Howa in Japan),
Mark V; Ruger#1, 77; Wichita; Mossberg; Magnum Research
Mountain Eagle; Thompson/Center Rifle;
30-06 - 1 in 12" twist
Husqvarna; Remington 700 Varmint (old);
Browning 78.
I hope this list is of help...
Strength & Honor...
Ron T.