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Rifles, Reloading, Optics, Equipment
Reloading
Cold temp caused faster speeds
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<blockquote data-quote="BUSTINDOGS" data-source="post: 2064159" data-attributes="member: 49798"><p>I work as a machinist and do a lot of aero space work were we need to hold very tight tolerances. I have literally made parts that were within tolerance at 78-82°F that were no longer within tolerance at 68.5°F. based on this i would think the increase in velocity is caused by the bore size becoming smaller and increasing pressures when cold. Based on my research the linear thermal expansion coefficient of 416ss is 6.4 and going from 68°F to 0°F would cause the bore diameter to shrink by .0002 I have worked a lot with 15-5, 13-8 and 17-4 PH stainless and based on my experience with these materials I would think the bore size would change by more than the .0002</p></blockquote><p></p>
[QUOTE="BUSTINDOGS, post: 2064159, member: 49798"] I work as a machinist and do a lot of aero space work were we need to hold very tight tolerances. I have literally made parts that were within tolerance at 78-82°F that were no longer within tolerance at 68.5°F. based on this i would think the increase in velocity is caused by the bore size becoming smaller and increasing pressures when cold. Based on my research the linear thermal expansion coefficient of 416ss is 6.4 and going from 68°F to 0°F would cause the bore diameter to shrink by .0002 I have worked a lot with 15-5, 13-8 and 17-4 PH stainless and based on my experience with these materials I would think the bore size would change by more than the .0002 [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Cold temp caused faster speeds
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