I tried handloading for the K-31 with the venerable 175 SMK's...
Couldn't do any better than the GP-11 ammo...it's amazing stuff.
And at .50 round, I can't handload match ammo any cheaper (especially these days).
07 FFL /Mosin-Nagant Custom Shop/Bent Bolts
Custom Bolt Actions/Re-barreling/Brake Installs
Genuine Cerakote Applicator