Just a quick question; I chronoed a 6PPC load today at around; 5°C, 300meters above sea level, 2 feet from Chrono and got a mean velocity of 3011fps & 3057fps for Lapua and Sako brass using the same load respectively. Forgot to check air pressure. 25.3gn VV N130 70gn Nosler Ballistic tip. When I take that ammo back to Australia (leave tomorrow) and shoot it at around 100meters(300ft) in much hotter temperatures from 28°C to 40°C(100°F?) how much of an increase in MV should I expect? I have run it through an online ballistics calculator but that can only tell me how a bullet will behave in different conditions with the same MV. Should the MV not raise also as I go into the desert? By how much?