Okay so I need some help. A few months ago I went to verify old dope for my prairie dog load and found the dope to be dead on inside 300, but at 570, it was about 0.6 mils low. The conditions were 40 degrees at about 750 ft ASL for a DA of about -340 ft. I thought it was from the polymer tips melting and dropping the BC - ammo is factory fiocchi 50 gr vmax - and everyone was extremely helpful with ideas. Then yesterday I went out to check my dope for next week's prairie dog trip to Nebraska, and my dope was dead on at 300, and at 590, I only needed 4.1 mils in 70 degrees and about 1400 ASL for a DA of about 2500. This new dope says that at 570 I would only need 3.8 mils. JBM says the DA shift should only account for 0.3 of the difference from the 4.7 in the cold vs 3.8 in the warmer weather. Is this wild swing due to the temperature of the ammo? I'm not powder expert since I don't reload and I don't know what powder fiocchi uses. I know most people use DA to figure out their adjustments, but does a 3000 ft change in DA from elevation necessarily equal a 3000 ft change in DA from mostly temperature? Any past experience with this kind of stuff would be sincerely appreciated.