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Extreme Long Range Hunting & Shooting (ELR)
how do you measure barrel temperature in a reliable manner?
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<blockquote data-quote="P7M13" data-source="post: 2293562" data-attributes="member: 94154"><p>Au contraire! Thermal conductivity, emissivity, coefficient of expansion, shear modulii, to name a few, are all thoroughly studied properties of the numerous alloys of steel. Why? Lives depend on that information.</p><p>You could figure it out if you wanted to, the math is pretty fun - though I haven't done it in decades. I do still have a few steel books on my shelf though. Good reference information that you would be hard pressed to find on the internet.</p><p>If you *really* wanted to know what was happening with the temperature on your barrel, I'd recommend a thermal camera from Flir. Temperature will affect your accuracy way more in terms of the heat distortion of the steel in your barrel due to thermal gradients and stress profiles. If your barrel was not annealed properly, there will be residual stress that can amplify the distortion of the barrel on heating.</p><p>Like most everyone has said, you are *way* overthinking this.</p><p>Some suggestions:</p><ol> <li data-xf-list-type="ol">Take up reloading. You will *really* be able to tune your loads.</li> <li data-xf-list-type="ol">An SD of 8.5 is good, but that generally means your ES will be in the double digits. Some thoughts on that:<ul> <li data-xf-list-type="ul">Reloading will give you the opportunity to dial that in tighter.</li> <li data-xf-list-type="ul">As mentioned by Alex Wheeler in another thread, ignition is everything. Four things that can really affect this are primer selection, primer seating, flash hole uniformity and the consistency with which your firing pin strikes the primer. You may see the results of this through single digit ES and SD. BUT, the whole point of that is to turn one variable in the accuracy equation into a constant. <br /> Trigger time and reading the wind are some of the hardest variables to master.</li> </ul></li> <li data-xf-list-type="ol">You used the phrase, "what the Pros do...." When I hear that, I hear a person who drinks the Koolaid or is just asking to get fleeced. If you haven't already, join a club, shoot competition, talk to the guys there. Some will be sponsored -- not in some lucrative way like we might imagine, and most will do it for the love of the sport. You will learn oodles just watching them, and even more chatting. Shooting with others gives perspective so you don't loose sight of the forest from the trees.</li> <li data-xf-list-type="ol">Back to #1, take up reloading. It won't save you money. Shooting, and especially LR, is an expensive hobby/sport. What happens is you will shoot a heckuva lot more, and spend less in the process.</li> <li data-xf-list-type="ol">[edit to add] Heat affects the reaction rate (burning rate) of gunpowder, which is one reason why many in LR are concerned with temperature sensitivity. It's the ambient temperature that has the most effect because that will be the temperature of your powder in most cases. Unless you chamber a round in a hot barrel and then wait. If you are a deeply skilled shooter, you may see the difference the barrel temperature has on your developed pressure and MV, but in all likelihood, the barrel distortion has a much greater effect.</li> </ol></blockquote><p></p>
[QUOTE="P7M13, post: 2293562, member: 94154"] Au contraire! Thermal conductivity, emissivity, coefficient of expansion, shear modulii, to name a few, are all thoroughly studied properties of the numerous alloys of steel. Why? Lives depend on that information. You could figure it out if you wanted to, the math is pretty fun - though I haven't done it in decades. I do still have a few steel books on my shelf though. Good reference information that you would be hard pressed to find on the internet. If you *really* wanted to know what was happening with the temperature on your barrel, I'd recommend a thermal camera from Flir. Temperature will affect your accuracy way more in terms of the heat distortion of the steel in your barrel due to thermal gradients and stress profiles. If your barrel was not annealed properly, there will be residual stress that can amplify the distortion of the barrel on heating. Like most everyone has said, you are *way* overthinking this. Some suggestions: [LIST=1] [*]Take up reloading. You will *really* be able to tune your loads. [*]An SD of 8.5 is good, but that generally means your ES will be in the double digits. Some thoughts on that: [LIST] [*]Reloading will give you the opportunity to dial that in tighter. [*]As mentioned by Alex Wheeler in another thread, ignition is everything. Four things that can really affect this are primer selection, primer seating, flash hole uniformity and the consistency with which your firing pin strikes the primer. You may see the results of this through single digit ES and SD. BUT, the whole point of that is to turn one variable in the accuracy equation into a constant. Trigger time and reading the wind are some of the hardest variables to master. [/LIST] [*]You used the phrase, "what the Pros do...." When I hear that, I hear a person who drinks the Koolaid or is just asking to get fleeced. If you haven't already, join a club, shoot competition, talk to the guys there. Some will be sponsored -- not in some lucrative way like we might imagine, and most will do it for the love of the sport. You will learn oodles just watching them, and even more chatting. Shooting with others gives perspective so you don't loose sight of the forest from the trees. [*]Back to #1, take up reloading. It won't save you money. Shooting, and especially LR, is an expensive hobby/sport. What happens is you will shoot a heckuva lot more, and spend less in the process. [*][edit to add] Heat affects the reaction rate (burning rate) of gunpowder, which is one reason why many in LR are concerned with temperature sensitivity. It's the ambient temperature that has the most effect because that will be the temperature of your powder in most cases. Unless you chamber a round in a hot barrel and then wait. If you are a deeply skilled shooter, you may see the difference the barrel temperature has on your developed pressure and MV, but in all likelihood, the barrel distortion has a much greater effect. [/LIST] [/QUOTE]
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how do you measure barrel temperature in a reliable manner?
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