temp

  1. F

    Temp change and POI change?

    seems like the last time I loaded some rounds was March and I am just getting to shoot some distance again. Loads are 168gr Match 45.5gr Varget@2765. only get to shoot to 500yds. 100yds still 0, but walking out it was increased to 4.5 to 5 MOA less dial in today. Varget is supposed to be...
  2. XLR

    A-5 stock in high temp

    I went out shooting early Sunday morning with my 308 and as always shot around 1/4 moa groups. Temperature was cool at 58 degrees DA around 6800 ft. That afternoon, I suffered the heat and went and shot with temperatures reaching 100 degrees and DA jumped to 7600 feet. Surface temperature on...
  3. D

    Range Report Theoretical Look at POI vs. Barrel Temp

    There is an argument raging about the effect of barrel temperature on POI. That's taking place on a paid thread that I choose not to join. But maybe the following comments will add some light to the discussion: Guns do what guns do. Sometimes we can do a pretty good job of predicting that...
  4. Outlaw45

    Advanced Marksmanship ammo temp?

    I've been reading the book, "50 caliber Sniper Course, Hard Target Interdiction." It has good info on shooting other than 50 caliber guns. It talks about ammo temp a few times and how it can affect the ballistics. For example it says the air temp is 75 degrees and the ammo temp is like 100...
  5. Bigwheels

    Range Report Powder Temp Compensation?

    I've been cronying some loads in my 300 WM, & with H-RETUMBO, I'm seeing an increase in velocity when it gets colder. Now anyone know how I can get my FFS software to accept a negative for powder temp. ie. -2fps/*F?
  6. Killswitch Engage

    mv to temp ratio

    anybody got an idea on what the increase is in fps for a given rise in temp. i was instructed that it was appx 50fps for every 20deg f rise in temp. anyone think that is accurate or indifferent?
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