I shoot a 300 Win. Magnum and Iím a little confused. Iím at 4100 feet elevation and in the summer when its 95 degreeís F. I load a 180 Gr. HPBT Sierra #2220 with 73.3 grains of IMR4831 and can hit a 50 cent piece at 200 yards every time. Now that itís cold 37 degreeís F. Iím shooting about 2 feet high I thought it was the other way around you shoot farther when itís Hot and shorter when itís cold but itís the opposite whatís going on?