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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
RL33 Temperature Regression Thread
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<blockquote data-quote="Pdvdh" data-source="post: 993126" data-attributes="member: 4191"><p>I don't disagree with your above statements. Which is why I shoot rifles to record cold weather MV quickly after I remove them from a freezer into warmer temperatures.</p><p></p><p>I do disagree with your original statement that significant "sweating" occurs inside of the cartridge casing, thereby affecting and degrading the powder. Because the inside of the casing is sealed from the unlimited amount of moisture that can form on the exterior of the casing or cold barrel.</p><p></p><p>If an action fails because the chamber walls are moist with water or Slick 50, reducing the friction between the casing and the chamber walls, then the cartridge operating pressures either exceeded book maximum pressures, or the action was defective. Bolt action rifles and ammo are designed such that the bolt lugs resist bolt setback forces in and of themselves, without the assistance of the resistance/friction between the cartridge case and the chamber walls. We don't rely on the brass cartridge casing to resist bolt thrust, or bolt setback forces. We can lube the chamber wall with a light coating of corrosion preventative (say Rem gun oil), which will reduce the friction between the chamber wall and the brass casing more so than water, and the rifle action should never fail shooting ammo loaded to maximum book pressures.</p><p></p><p>I have experienced excessive pressure signs when I purposely lubed my chamber with lubricant to test for stiff bolt lifts, compared to a dry chamber. And I did experience stiff bolt lift with my .280 AI when I ran that test. But then again, my reloaded ammo is undoubtedly running at higher than maximum accepted pressures. </p><p></p><p>Sorry if I riled your sense of pride. That wasn't my goal. But I stand by everything I've posted in response to your claim that one needs to be careful about freezing ammo because moisture will form within the gunpowder when the cartridge is then later placed into a warmer atmosphere/environment. That statement would imply that hunting in really cold temperatures, and then bringing unfired ammo back into a warm house, is cause for concern regarding future cartridge performance and reliability. It's not.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 993126, member: 4191"] I don't disagree with your above statements. Which is why I shoot rifles to record cold weather MV quickly after I remove them from a freezer into warmer temperatures. I do disagree with your original statement that significant "sweating" occurs inside of the cartridge casing, thereby affecting and degrading the powder. Because the inside of the casing is sealed from the unlimited amount of moisture that can form on the exterior of the casing or cold barrel. If an action fails because the chamber walls are moist with water or Slick 50, reducing the friction between the casing and the chamber walls, then the cartridge operating pressures either exceeded book maximum pressures, or the action was defective. Bolt action rifles and ammo are designed such that the bolt lugs resist bolt setback forces in and of themselves, without the assistance of the resistance/friction between the cartridge case and the chamber walls. We don't rely on the brass cartridge casing to resist bolt thrust, or bolt setback forces. We can lube the chamber wall with a light coating of corrosion preventative (say Rem gun oil), which will reduce the friction between the chamber wall and the brass casing more so than water, and the rifle action should never fail shooting ammo loaded to maximum book pressures. I have experienced excessive pressure signs when I purposely lubed my chamber with lubricant to test for stiff bolt lifts, compared to a dry chamber. And I did experience stiff bolt lift with my .280 AI when I ran that test. But then again, my reloaded ammo is undoubtedly running at higher than maximum accepted pressures. Sorry if I riled your sense of pride. That wasn't my goal. But I stand by everything I've posted in response to your claim that one needs to be careful about freezing ammo because moisture will form within the gunpowder when the cartridge is then later placed into a warmer atmosphere/environment. That statement would imply that hunting in really cold temperatures, and then bringing unfired ammo back into a warm house, is cause for concern regarding future cartridge performance and reliability. It's not. [/QUOTE]
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RL33 Temperature Regression Thread
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