I think I remember you have a hate-hate relationship with H335, but if you will prime your cases with Rem 7-1/2 primers and put 20 grains of H335 under a 20 grain VMAX I think you'll find a sweet spot. I had a standard sporter blued SPS and it'd put that load into 3/8" groups for 5 shots. All fouling ceased after the first 100 rounds.
Dang cartridge is about as much fun as you can have without gettin' nekkid.
Tom