It rained us out of the hayfield, so I tried H4350 extreme today, I've had good luck getting low deviation with it in my 270 win. I improved my groups slightly and increased my speed slightly to an average of 3046fps over 20 shots. I had a couple 4 shot 1 hole groups, and only 1 went over 1/2". My rifle is an A-bolt with the 23" barrel which probably accounts for the slightly slower MV. My deviation remained similar, 32fps. I am using CCI magnum primers. I am down to 12 accubonds, so I loaded them to shoot critters with and will get to town in the next few days to buy more. I am very happy with the accuracy in a rifle that weighs 7.25lbs with scope. I'm using 4 shot groups because of the light barrel and 100 degree heat. It's going to be in the low 80's next week so I can see if my velocity changes. I'm hoping to avoid much velocity change with the extreme powder. I'm going to use this rifle on a muley hunt at 7-9000ft in October so I think I will get 2 turrets built for my elevation (1200ft) and for the area I hunt most years in the mountains.
With 32ft deviation over 20 shots should I call it good on load development?