I tried the lighter weight VMax bullets in my Savage .243, but could not get decent accuracy out of them until I got up the the 87" grain bullet. I know others who have had good luck with the lighter weight bullets, but that's not been my fortune. I got great accuracy with the 70 Nosler BT, getting 3425 fps. and 5/8" 3 shot groups at 100 yards. I believe the gun can shoot more accurately, but the 8 powder scope with cross hairs which subtend about 1" at 100 yards makes shooting tighter groups problematic. I found I could go faster than 3425 fps., but the accuracy started to fall off at 3450 fps.. I tried several different powders, but the only one which delivered good accuracy in hot temps and in cold temps was SR3031. This has been true with the other 6mm rifles I have had. I haven't tried any of the extreme powders form Hodgdon, being satisfied with the SR3031.