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?

ricciardelli had posted:

http://stevespages.com/tempvsvelocity.html

http://stevespages.com/page8.htm

On another thread of the same topic:

https://forums.accuratereloading.com/eve/forums/a/tpc/f/2511043/m/462102783

MV will not change with elevation. Only the downrange ballistics will. MV will only change with changes in the temperature of the ammunition, not in changes in air temperature. If you have a way to keep the ammunition at a temperature consistent with the temperature during the tests, the only changes will be downrange due to elevation.