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Hunting
Extreme Long Range Hunting & Shooting (ELR)
how do you measure barrel temperature in a reliable manner?
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<blockquote data-quote="ntsqd" data-source="post: 2292829" data-attributes="member: 93138"><p>The point is that different metals and different surfaces have different emissivities. Some will be fairly close to the same while others are far different and you can't compare a reading from one rifle to the reading from another unless their materials and surface finishes are the same. Even then there can easily be a small difference that likely won't matter for this use, but it there all the same. If all you're doing is taking readings from one rifle then this doesn't matter. As soon as you want to take a reading from a second rifle and compare it to the first then now it matters. How much it matters depends on the different emissivities.</p><p></p><p>Where I learned this was in comparing a machined aluminum part to a cast aluminum part that were bolted together. There was a difference in those readings that was significant to what we were doing (~10°) and it had us chasing our tails for a while. Simply Scotch-Briting both surfaces and then putting a spot of flat black paint on each got the two readings to agree.</p></blockquote><p></p>
[QUOTE="ntsqd, post: 2292829, member: 93138"] The point is that different metals and different surfaces have different emissivities. Some will be fairly close to the same while others are far different and you can't compare a reading from one rifle to the reading from another unless their materials and surface finishes are the same. Even then there can easily be a small difference that likely won't matter for this use, but it there all the same. If all you're doing is taking readings from one rifle then this doesn't matter. As soon as you want to take a reading from a second rifle and compare it to the first then now it matters. How much it matters depends on the different emissivities. Where I learned this was in comparing a machined aluminum part to a cast aluminum part that were bolted together. There was a difference in those readings that was significant to what we were doing (~10°) and it had us chasing our tails for a while. Simply Scotch-Briting both surfaces and then putting a spot of flat black paint on each got the two readings to agree. [/QUOTE]
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how do you measure barrel temperature in a reliable manner?
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