I've been doing some load development for the 35 whelen. Gun is a ruger hawkeye I rebarreled with a green mountain blank. Currently using the saeco 352, GC, powder coated.
I started some load work up aiming for the 1800-2100 FPS range using many different powders, including BLC2, 3031, 4198, 4320, and 4350. Best result were with 4350, had a 0.7" at 50 yards, worst was BLC2, which was 1.75" at 50. That load was probably too hot and had some thump when shooting.
Anyway, with the encouraging result of the 4350, I was thinking about trying slower powders, slowest I have are 4955 and 7977. Anyone have any experience using these or similar powders when heavies in the 35 whelen?