Varget will work fine in 222/223 size cases up spinafish. Varget might be a possibility, but it wouldn't be my choice in the 6.5JDJ. I've had 2 SSK barrels chambered for the 6.5JDJ, both 14" stainless. My powder choices were 760, RE15, N-160, 4350, 414, 2520 and 2015 (in approx that order).
FWIW