Here's the 'factory job' as available from the 1939 Stoeger catalog; "Supplied regularly only in caliber .30-06 U. S. but can be had on special order in any other Mauser caliber.":

Actions for builders (No. 4 is 8X60):

Ballistics:

Scope mounting:

Claw mounts are wonderful! My (formerly Grand-dad's) Mannlicher Schönauer M1910 has them. Scope is removed and / or replaced effortlessly and instantly with precise return to 'zero'.

Here is a modern source for them: New England Custom Gun

Their full catalog: NECG Catalog