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Rifles, Reloading, Optics, Equipment
Reloading
Temp sensitivity
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<blockquote data-quote="Bart B" data-source="post: 797994" data-attributes="member: 5302"><p>Type 316 stainless steel expands about 9 millionths of an inch per degree F rise in its temperature. Going from 60 to 150 degrees F., a 30 caliber barrel (.3000" & .3080" numbers) will expand to about .300275" bore and .308276" groove diameters. Enough to have its effect of larger diameters drop muzzle velocity a dozen fps, in my opinion. But that's probably masked by the powder's higher temperature.</p></blockquote><p></p>
[QUOTE="Bart B, post: 797994, member: 5302"] Type 316 stainless steel expands about 9 millionths of an inch per degree F rise in its temperature. Going from 60 to 150 degrees F., a 30 caliber barrel (.3000" & .3080" numbers) will expand to about .300275" bore and .308276" groove diameters. Enough to have its effect of larger diameters drop muzzle velocity a dozen fps, in my opinion. But that's probably masked by the powder's higher temperature. [/QUOTE]
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Reloading
Temp sensitivity
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