Ran various powders through the following:
308 - Varget, I4064 & 4451 with both 165 SGK and 180 SGK
Results: I4064 was the best in MY rifle with the 165's but the 4451 was golden with the 180's.
25-06 - H4831, I4831, I4350, RL 26, RL 19, H1000 & 7977.
110 gr AB's
Results: H4831 very accurate but I have a 25-06, not a 257 Roberts (velocity in the 2700fps range). I4831 no luck, same with I4350 and RL 26. RL 19 had good accuracy and a bit more velocity than H4831, but alas, once the temps got into the 70's the pressure was too much. H1000 didn't work so I tried the 7977 - 5 shot sub-.75" groups and velocity in one of the rifles @ 3050fps and in the other rifle 3175.
