I kid you not. Not only is it 0.5 grains difference but actually is 0.2 grains. Could not believe it till I tried it twice. Same results. 27.0 is the sweet spot on my barrel. I know from reading on the benchrest site that there are what they call "nodes" in the loading. I loaded up to 27.6 and it looked like maybe another might be coming in at about 28.0 or there abouts. Next trip to the range will find out. Then I will start playing with the seating depth on the bullets. See if that has any improvement on the groups. :-) Plus this is the first time I have tried Winchester powder. I have always been a Hodgen fan, that and IMR. It looks the same as the H335 and H322 and H380 and H414, but something is for sure different, at leat in my rifle.