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Long Range Hunting & Shooting
How does cold affect your barrel?
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<blockquote data-quote="Hired Gun" data-source="post: 90605" data-attributes="member: 1290"><p>As a welder fabricator and journeyman millwright I used to work with both all the time. Stainless is far harder to machine than chrome moly. I challenge you to bust out some high speed steel drill bits and try to drill a hole through any piece of stainless. On just one hole you will dull many bits trying and when it breaks through you will break the bit. Now take same set of bits and drill some chrome moly. It drills nicely hole after hole. Stainless is used in industrial applications for its heat and erosion resistance. Now take both and try to cut them with a torch. You will whiz right through CM but when you get to the stainless you are done A torch with the oxygen stream going is way hotter than the temp of some burnt powder. This is why stainless is used in bench rest because the throats lasts longer in the heat of firing. Now days the only reason to use chrome moly for a barrel is if you are dead set on having it blued. As far as reaming stainless it takes special feed rates, special cutting fluids and an understanding that stainless work hardens as you machine it so once you stop or back the reamer out it is hard to restart it. It helps to drill it as close as possible before you bring out the reamer to finish it up. Was the reamers in question carbide or HSS? </p><p></p><p>The properties of stainless are not changing enough between 200+ degrees and 60 below to cause it to be brittle enough to crack from shooting or affect hardness measurably.</p></blockquote><p></p>
[QUOTE="Hired Gun, post: 90605, member: 1290"] As a welder fabricator and journeyman millwright I used to work with both all the time. Stainless is far harder to machine than chrome moly. I challenge you to bust out some high speed steel drill bits and try to drill a hole through any piece of stainless. On just one hole you will dull many bits trying and when it breaks through you will break the bit. Now take same set of bits and drill some chrome moly. It drills nicely hole after hole. Stainless is used in industrial applications for its heat and erosion resistance. Now take both and try to cut them with a torch. You will whiz right through CM but when you get to the stainless you are done A torch with the oxygen stream going is way hotter than the temp of some burnt powder. This is why stainless is used in bench rest because the throats lasts longer in the heat of firing. Now days the only reason to use chrome moly for a barrel is if you are dead set on having it blued. As far as reaming stainless it takes special feed rates, special cutting fluids and an understanding that stainless work hardens as you machine it so once you stop or back the reamer out it is hard to restart it. It helps to drill it as close as possible before you bring out the reamer to finish it up. Was the reamers in question carbide or HSS? The properties of stainless are not changing enough between 200+ degrees and 60 below to cause it to be brittle enough to crack from shooting or affect hardness measurably. [/QUOTE]
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How does cold affect your barrel?
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