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Thread: Barrel cooling technique?

  1. #1
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    Barrel cooling technique?

    New here so I'll say Hello all. My question concerns the proper technique to use between shots. I don't shoot benchrest but do get a gereat deal of satisfaction trying to wring out every bit of accuracy I can. I'm sure this topic has been beaten to death but would really appreciate your patience and information. Thank you in advance, smoker

  2. #2
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    Well with 165 viewing my question and not one response I have to consider I'm not asking this question correctly or it's so basic that it doesen't require an answer. smoker

  3. #3
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    Normally, I am able to shoot a five shot group without worrying about barrel cooling, this being with heavy barreled and/or light caliber varmint rifles. My usual standard, for when a barrel requires time to cool is when it approaches a barrel temperature that would be uncomfortable to leave a hand on, on any part of the barrel. There are some who cool their centerfire competition Benchrest rifles with battery powered rigs that circulate liquid through the bore between matches. Others may lay a cold wet towel across the barrel to accomplish the same thing. Most do neither.

    If I am testing a thin barreled hunting rifle in a large game caliber, I usually shoot three shot groups, to avoid barrel heating problems, and simply wait for the barrel to cool between groups. From what I see at the range, the average shooter has more to gain by building or buying a set of wind flags and /or improving his rest setup than worrying about minor barrel heat issues.

  4. #4
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    First, I'm no expert compared to these guys.

    But . . . .

    I agree with the guy who states a barrel is getting too hot when you cannot grasp your hand around it comfortably. Note, it can be plenty warm but you can still grasp it, so this is getting pretty hot.

    Another point-- with my 18X scope, I start getting optical distortion up from the barrel when the barrel gets good and hot. It looks wavy, like you are seeing something underwater. I often wonder if this optical distortion shifts the aiming point -- you think your Xhairs are on the aiming point, but the distortion puts you a half inch high?

    Once the barrel on my varmint rifle (heavy barrel) gets good and hot, it seems to take quite a while to cool down very much. One good bet is to have a second rifle with you, shoot that one for a while, and just retire the warmed up barrel for about 20 minutes. Even then, it will probably be less hot, but still good and warm.

    How many rounds do you normally plan to fire at a range session? I usually try to limit my shooting to 20 or 30 rds. I'm talking here about a practice session, or an ammo testing session.

    A heavy barrel has advantages and disadvantages over a sporter-weight barrel. It takes a heavy barrel longer to heat up, but it takes longer -- in turn -- for it to cool down.

    I'm surprised there were not more comments.

  5. #5
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    Thank you Boyd Allen. Not being a compeitive shooter I've not had the chance to associate with the folks that know. So I can assume that from a cold barrel I should be able to get at least three shot groups without a cooling period in between. I always wondered how much effect the heating barrel had on group size. Thanks again, and good luck to you. smoker

  6. #6
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    Montana Pete, thanks for chiming in. My question arises from working up new loads. I've been shooting and reloading for more years than I would like to admit to and have always heard about heated barrels causing one thing or another. I'm presently working up a load for my 300WSM....not a pleasure after 10 rounds or so. Old bones. This rifle heats up pretty fast...maybe after 2 or 3 rounds. I suppose it wouldn't hurt to let it cool between every round. smoker

  7. #7
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    barrel heating

    Well I used to be way too over concerned with barrel heating. The local guys I was shooting with were telling me 1 to 5 minutes between shoots. As I started shooting more I found this just was not practical. Heating probably has a significant role in accuracy with a light weight barrel. I don't own any of those. I shoot F-class and some BR. In FClass, we shoot +20 shots in 15-20 minutes. My barrel is always so hot I don't want to touch it after a round. In bench rest, I will fire out 5-8 sighters plus five for score or group in the 7-10 minute round. Again warm barrels.

    Shoot and enjoy, tiny
    Last edited by tiny68; 04-24-2009 at 02:19 PM.

  8. #8
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    I used to pour water down the bore between strings while working up loads. A tight fitting hose in the chamber, poured out onto the ground, a small amount of water will cool the barrel completely, then clean and shoot.

  9. #9
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    That's the stuff I was looking for...actual experience. So with heavy varmint barrels heating should'nt be a problem at all and the sporter type barrels minimal change. Good info, thanks Tiny.

    jlmurphy, never tried water but have done the wet towel thing. Major problem with me is that I never know if it's my shooting or the heat. Guess I'm getting an education here. smoker

  10. #10
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    It's hard to beat a wet towel, folded and draped over the barrel its full length. It's simple, inexpensive, no fuss and works as well as or better than anything else. Of course, here I'm talking about stainless steel benchrest barrels and not blued custom chrome moly barrels on pencil thin hunting rifles.

    Gene Beggs

  11. #11
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    + one on Gene's advise, but I sure would not want to get excited or even think about it until the string was finished. If a guy was worried about the time between relays, then I would want to keep the wet towel in a water can full of ice water. Remember, the greater the temperature difference of the wet towel and the barrel temperature the faster you will pull the heat out of the barrel.

    Running water out of the spigot at some of these southern range seem hotter than the barrels we try to cool.

  12. #12
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    Alcohol


  13. #13
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    Smile Pete ...

    Quote Originally Posted by Montana Pete View Post
    Another point-- with my 18X scope, I start getting optical distortion up from the barrel when the barrel gets good and hot. It looks wavy, like you are seeing something underwater. I often wonder if this optical distortion shifts the aiming point -- you think your Xhairs are on the aiming point, but the distortion puts you a half inch high?
    What you're seeing is barrel mirage (heatwaves) which can be introduced after only 3 to 4 rounds down the barrel and ... "will do their utmost to confound your best efforts to read the conditions on the range by introducing another set of mirage into the picture you see through the scope and one that is totally irrelevant to the real condition on the range" ... so says Walley Siebert.

    Walley talks about this in his article on Benchrest Optics in the The Benchrest Shooting Primer starting on page 97. (The Primer can be obtained by calling Precision Shooting Magazine at 860-645-8776)

    The cure: a mirage shield or shade. Made from something as simple as a piece of paper taped to the barrel and extending from under the scope to the end of the barrel. Sinclair International carries a more sophisticated device for $4.50. It resembles a piece of venetian blind. Go to this site for a view: http://www.sinclairintl.com/prod_detail_list/s.

  14. #14
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    Quote Originally Posted by Montana Pete View Post
    ..Another point-- with my 18X scope, I start getting optical distortion up from the barrel when the barrel gets good and hot. It looks wavy, like you are seeing something underwater. I often wonder if this optical distortion shifts the aiming point -- you think your Xhairs are on the aiming point, but the distortion puts you a half inch high?
    ...
    Here are a couple ideas...






  15. #15
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    Dec 2006
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    Cooling

    Between rounds, I have started cooling with an air pump that forces air down the barrel. I use a battery-powder minnow bucket pump from Wally World with pipet tips and just push this in my chamber until it losely seats. My logic is that the hot air in the barrel is not effectively transferred out and the cooling is slower. I watched this one day while I was cleaning one gun at the table while another gun I had just finished shooting was starting to cool. I could clearly see the mirage caused by the hot air slowly coming out of the barrel from my angle and the position of the sunlight. I would roughly guess it cuts cooling time in half. This summer I will get temperature that attaches to DMM and due some formal quantitative test of cooling with and without the pump. I can without a doubt say it helps.

    Luck, tiny




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