My gun shoots the 70NBT's great with about 48.1 of Reloder 19 and CCI BR-2's seated fairly short... 2.630" OAL, something like that. This only drives them about 3,250fps out of my Tikka T3 Lite, but accuracy trumps speed. I shot a lot of Varget with the 70's before I decided to switch powders and found this one then. My 22-250 LOVES Varget, my 243win - not so much. IMR-4350 and RL19, and even H4831sc with the heavier bullets seem to be the better bet in mine at least.