MV and Temp

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by EXPRESS, Dec 22, 2005.


    EXPRESS Well-Known Member

    Jun 25, 2003
    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?