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Long Range Hunting & Shooting
Proof Carbon Barrel Cooling
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<blockquote data-quote="ntsqd" data-source="post: 1693056" data-attributes="member: 93138"><p>It wouldn't be a one time event because even a HOT barrel isn't all that hot in terms of heat-treating temperatures. Over time the repeated rapid cooling will change the internal structure of the barrel metal. Think of it being similar to the "checking" that barrel throats can develop. I expect that since the temperature delta is not as large as there, that it would take longer to occur. Increase the delta and you'll shorten the time.</p><p></p><p>That is why I said that the technique will be critical. Goes back to what I quoted earlier in this thread "The more radical the temperature difference, the more radical the reaction." The guy who thinks he's going to take out half a squirrel mound with his .22 Eargasplittenloudenboomer (look it up!) and then bring that 300°C barrel back down to ambient temp with CO2 so he can dispatch the other half is in for a very, very short barrel life. Used with care and caution it may well be fine in a comp environ where a barrel's peak accurate life is short to start with. </p><p>I'd use just air on a field rifle.</p></blockquote><p></p>
[QUOTE="ntsqd, post: 1693056, member: 93138"] It wouldn't be a one time event because even a HOT barrel isn't all that hot in terms of heat-treating temperatures. Over time the repeated rapid cooling will change the internal structure of the barrel metal. Think of it being similar to the "checking" that barrel throats can develop. I expect that since the temperature delta is not as large as there, that it would take longer to occur. Increase the delta and you'll shorten the time. That is why I said that the technique will be critical. Goes back to what I quoted earlier in this thread "The more radical the temperature difference, the more radical the reaction." The guy who thinks he's going to take out half a squirrel mound with his .22 Eargasplittenloudenboomer (look it up!) and then bring that 300°C barrel back down to ambient temp with CO2 so he can dispatch the other half is in for a very, very short barrel life. Used with care and caution it may well be fine in a comp environ where a barrel's peak accurate life is short to start with. I'd use just air on a field rifle. [/QUOTE]
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Proof Carbon Barrel Cooling
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