Did some handloading for SIL's SVT-40 back in the 90's.
PPU Brass, WLR,
150gr HDY "303 caliber" Interlock, 50.0gr of IMR-4064. This charge should be considered MAX or slightly over. Start significantly lower and work up, paying close attention to primers and ejector markings. If the primers get significantly flattened, stop there and go no higher with the charge.
Close gas down significantly to start so case will not eject, then open it up in small increments until it ejects reliably. This adjustment was intended so the system would work with differing ammunition types, so keep that in mind if you change your load.
This rifle (and the SVT-38) were called the Russian Garand, but they were considerably less rugged and indestructible than the USGI Garand. Treat it with respect and don't overcharge the loads. It should use the same bayonet as the 91/30, and like all Russian rifles at the time was intended to be used with the bayonet mounted, otherwise POI will likely be off to the left quite a bit. Try to avoid messing around with the front sight, the bayonet belongs there. Contemporary Russian infantry doctrine forbade removing the bayonet except when being transported.
For other bullets, try starting with 308 loads for the same bullet. As usual; start low, work up.
Understand that you have a rarity, and that it's relatively delicate as MilSurp rifles go.
You may find
these folks a bit fun to read, if a little over the top...
Greg
