Recent content by Professor Doolittle

  1. P

    how do you measure barrel temperature in a reliable manner?

    That's interesting. I never heard of fire forming. It was new Lapua brass.
  2. P

    how do you measure barrel temperature in a reliable manner?

    Curious why you would bring up this second issue, how long the round bakes in the chamber before its fired. My instructor has me not chamber the round until everything is otherwise ready to go. I was taking the barrel temperature effect to be different from the cartridge heating effect. Which...
  3. P

    question for ELR hunters

    I was taking extreme long range hunting, the name of this forum, to be the distances of extreme long range shooting, i.e. a mile or more. Yes, I can see that if you're talking about under 1000 yards then the effect I'm asking about wouldn't be very relevant. Thanks for explaining that.
  4. P

    how do you measure barrel temperature in a reliable manner?

    I spray atomized water from a bottle on the barrel to cool it quicker, plus a chamber fan. My problem is more about how do you know you are at the defined starting temperature again? I see a lot of evidence that the muzzle velocity moves with barrel temperature so I want to nail down what's...
  5. P

    how do you measure barrel temperature in a reliable manner?

    Well I should have put more background into my initial post. The whole issue started with load ladder development, that in the process of shooting 60 rounds the barrel temp is climbing. I've read that pros will shoot five to ten rounds then come back to a cooled state but they never describe...
  6. P

    how do you measure barrel temperature in a reliable manner?

    No but I could characterize temperature versus change in muzzle velocity to support fine adjustment by educated guess in the field.
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    how do you measure barrel temperature in a reliable manner?

    I’m trying to be accurate at 1500 yards with a 300 norma mag. And my ammo runs a standard deviation of 8.5fps for muzzle velocity around 3100fps mean. Using my ballistics app the difference between plus and minus one standard deviation alone is two clicks on the turret. You’re right that...
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    question for ELR hunters

    For ELR hunters, do you think it’s possible that part of the reason an animal can be hit but not go down is not just because the bullet has low kinetic energy after all that distance but because the spin of the bullet is keeping it parallel to the axis of the bore which is pointed somewhat high...
  9. P

    is copper jacket spinning around lead core during flight

    They would know vastly more. I'm probably going to buy their applied ballistics software package, I think its like $200. What I really love from the demo I saw is it shows you the probability of a hit by distance, meaning the odds of hitting a bullseye at various distances depending on all the...
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    is copper jacket spinning around lead core during flight

    For a given gas composition it should be linear but I think what you mean is the Ideal Gas Law only holds up under limited conditions which may not apply at the high pressures in the chamber. But its still true that pressure cannot lead or lag temperature. Its not intuitive but the heat of a...
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