Josmund
Nice job... and you probably have only begun to find out what that rifle and load might do.
I shoot the 300 grain with 120 grains of powder and the accuracy hangs right in there. I do drop back down to 110 with the 250, and I can not remember why for sure I do not think it had anything to do with accuracy as much as it was the unneeded extra energy for deer hunting and my thinking I would not be shooting anything over 175 yards with it... more like 60 yards.
Good shooting!