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Long Range Hunting & Shooting
altitude effecting pressure
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<blockquote data-quote="jshepherd61" data-source="post: 2585276" data-attributes="member: 93960"><p>Not quite correct, burn rate is not instantaneous powder burns down the length of the barrel, humidity is instantaneous so once powder starts to burn the local humidity takes effect manipulating the burn rate in the barrel! If any of you use QuickLoad you will see this in the calculations. Example: 7mm STW 168gr ABLR loaded with 80.5gr Retumbo in a 29" barrel the complete burn is 27.3" down the barrel. That is 27.3" of burning that is humidity effected</p></blockquote><p></p>
[QUOTE="jshepherd61, post: 2585276, member: 93960"] Not quite correct, burn rate is not instantaneous powder burns down the length of the barrel, humidity is instantaneous so once powder starts to burn the local humidity takes effect manipulating the burn rate in the barrel! If any of you use QuickLoad you will see this in the calculations. Example: 7mm STW 168gr ABLR loaded with 80.5gr Retumbo in a 29” barrel the complete burn is 27.3” down the barrel. That is 27.3” of burning that is humidity effected [/QUOTE]
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