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Thread: Cold versus Hot Barrel Accuracy

  1. #11
    Senior Member Brady's Avatar
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    Quote Originally Posted by HC015*** View Post
    I remember the man with the longest recorded sniper kill said he referred to an "old sniper trick" where he would leave his ammo out in the sun and that would make the bullets fly farther. He was able to hit the guy way out there no problem, not exactly sure what science is going on here but I'm sure hotter bullets are better on paper than a bullet sitting in a very hot chamber. I assume the powder burns more evenly or faster? He did mention that he was using American made ammo which did act differently in the air, and they realized by leaving the ammo out in the sun it did help the trajectory or flight path if you will of the bullet to the target.
    I think I remember Tom Beringer talking about the same thing, only he did it with a pocket knife....
    "When it rains, do you run from doorway to doorway, trying to stay dry, getting wet all the while? Or do you just accept the fact that it's raining and walk with dignity?"


  2. #12
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    Some powders are more susceptible to ambient heat in the chamber or environment than others. But in the end, excess heat is just one more variable introduced into accuracy that can cause change. It is no different than a slight variation in overall length / bullet seating depth, a slightly thicker neck on a case, etc. Accuracy is all about consistency. Minimizing variables in cartridge construction / reloading, shooting technique (< especially that one) and environment all translate on paper.

  3. #13
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    I'd agree on the consistency factor. My groups tend to drop 1-2 inches with more lateral movement as the barrel gets hot. For me it starts about mid-way through the 2nd 20 round mag, at a fire rate of maybe 3 rounds per minute interspersed with a 5 minute walk down the range and back.

    Like Sarge said this is about the time you don't want to touch the barrel with bare skin.

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