Below is a break down of Mauser actions.
A Small ring Mausers are 1.30" in dia. and are 8.50" in length, with screw spacing of 7.620".
These include M-93-96 by Spain, Sweden, and Germany.
The M1910, M1936 Mexicans by FN and Mexico, 1.30" dia. receiver ring, 8.50" in length, with screw spacing of 7.620". Receiver is slightly different from Small ring.
The WWI German KAR98A, 1.30" dia. receiver ring, 8.70" in length, with screw spacing of 7.835" (long action, small ring).
Intermediate Large ring action Mausers, 1.40" dia. receiver ring, 8.50" in length with screw spacing of 7.620" M24 Mexicans by FN and Belgium, the M24, M47, M48 by FN and Yugoslavia.
A Large ring M98 Mauser action is, 1.40" dia receiver ring, 8.70" in length, with screw spacing of 7.835". Including M98 from WWI and WW2, Cz-24, VZ-24 and many others.
Mauser factory commercial magnums 1.50" in dia., 9.240" in length, have a hole spacing of 8.207".
Ring/Small ring size is determined by the dia of the front receiver.