Recipe for the 140 NosParts......
Rem brass--WLR primers--45.0 grains IMR 4831, scaled and trickled up. My Duo-Measure is a little balky with the long-cut 4831. Brass life has been good, 4 firings before a trim is required (F/L sizing), and no loose primer pockets after 10-12 firings. I toss most of my rifle brass when it needs its 3rd trimming.
These are warmish loadings, not sure I would use them in a milsurp Mauser. Your call as far as that goes, you have forgotten more than I'll ever know about handloading. The load has shot well for me for a long time, and took my 2006 muley very decisively.
An "economy load" that Buckshot came up with for the 6.5 x 55 using any 140 grain jacketed bullet is a full case (55.0 grains) of WC-860 milsurp powder. He claimed military spec velocities and docile pressures with the load. I have run the NosPart 140 and the Hornady 140 spitzer (#2630) with this load, and both are 1" at 100 yards performers, though velocities are 2400-2450 FPS. That is fairly close to 1896-level mil-spec performance.