Re: hot weather shooting ?
I was just doing my ballistics tables for hunting elk in the mountains this fall with my fifty. I was doing a whole series of ballistic tables to cover variables of distance, elevation (5000 ft to 13,000) and temperature (0-70 degrees). While I was looking over the tables, I noticed that the biggest effect on MOA, other then range, was temperature. The differences in MOA at a fixed range and altitude, for a difference in temperature of say 30 degrees to 70 degrees was amazingly large. Altitude had much less effect on MOA. Throw in a difference in ammo temperature, and yea, I could easily see how you could get this much difference in MOA. Additionally, if your ammo was sitting in a fifty cal ammo can, in the sun, with the air temp being 90 degrees. The ammo ain't at 90 degrees, it's probably at 150 degrees.