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Rifles, Reloading, Optics, Equipment
Reloading
Rising velocities in a warming barrel. Solutions? Remedies? Powder instability?
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<blockquote data-quote="Hired Gun" data-source="post: 1320398" data-attributes="member: 1290"><p>One other aspect to consider when shooting a cold vs. warm barrel is the variation in barrel temperature changing the dimensions of the bore. It would be interesting to keep track of the size of the barrel with a micrometer with .0001" resolution. A caliper won't have the resolution to see minor changes. One would need to mark a spot, for example right in front of the fore end, where it would be easy to measure and check the size at the beginning and end of each string. A tapered barrel will be hard to measure with much precision but I still think you will eventually note a trend.</p><p> </p><p>The proposed hypothesis: </p><p>Rather than velocity changing from powder sensitivity since it is stored in a stable spot until it is fired and it would take a while once chambered to actually warm the powder I suspect as the barrel gets warmer the bore diameter increases and creates less friction on the barrel causing bullets to go faster with the same given charge.</p></blockquote><p></p>
[QUOTE="Hired Gun, post: 1320398, member: 1290"] One other aspect to consider when shooting a cold vs. warm barrel is the variation in barrel temperature changing the dimensions of the bore. It would be interesting to keep track of the size of the barrel with a micrometer with .0001" resolution. A caliper won't have the resolution to see minor changes. One would need to mark a spot, for example right in front of the fore end, where it would be easy to measure and check the size at the beginning and end of each string. A tapered barrel will be hard to measure with much precision but I still think you will eventually note a trend. The proposed hypothesis: Rather than velocity changing from powder sensitivity since it is stored in a stable spot until it is fired and it would take a while once chambered to actually warm the powder I suspect as the barrel gets warmer the bore diameter increases and creates less friction on the barrel causing bullets to go faster with the same given charge. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Rising velocities in a warming barrel. Solutions? Remedies? Powder instability?
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