RamItOne,
I don't know why you chose 150 grain bullets for the .300, no serious LR shooter is going to run bullets less than 180 grains. With a 200 grain bullet you can stood retain over 1000 ft-lbs of energy at 1000 yards. Nor are very many shooters going to choose a 250 grain bullet over the high BC 300 grain offerings in .338.