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Long Range Hunting & Shooting
Accuracy of a hot barrel?
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<blockquote data-quote="Boss Hoss" data-source="post: 420038" data-attributes="member: 5060"><p>This is a very good question. First factory tubes as well as actions, bedding are not really conducive to adding heat because of the stress that is present. Stress in the steel in a perfect world is completely relieved during heat treating. Unfortunately mass produced rifles are not processed for the optimum performance rather a balance of affordability and performance.</p><p></p><p>A good barrel for example Krieger placed on a rifle that has been properly built on a prepared action and proper bedding job will not change POI when heated. I have sporters as well as match rifles that show absolutely no affect when barrel temps (heat also migrates to the action and stock) are elevated to the point of you cannot handle the barrel. </p><p></p><p>In my experience while watching others make this mistake is that when the temp of the chamber does rise considerably many people will chamber a round and leave it for a period of time while they adjust the rifle in the rest to shoot. This is not a good thing because as the round heats the powder being at an elevated temperature compared to the previous rounds will have a higher pressure therefore a different pressure curve causing the bullet to have a different POI and this will be especially apparent at longer ranges evidenced by vertical dispersion. </p><p></p><p>The argument about hot barrels and throat erosion is an old debate that some believe in others do not. The testing results on a 6ppc that were conducted by a friend of mine and a well known shooter and Smith shows it to be of little concern with that specific cartridge. This testing was done on non factory barrels FWIW.</p></blockquote><p></p>
[QUOTE="Boss Hoss, post: 420038, member: 5060"] This is a very good question. First factory tubes as well as actions, bedding are not really conducive to adding heat because of the stress that is present. Stress in the steel in a perfect world is completely relieved during heat treating. Unfortunately mass produced rifles are not processed for the optimum performance rather a balance of affordability and performance. A good barrel for example Krieger placed on a rifle that has been properly built on a prepared action and proper bedding job will not change POI when heated. I have sporters as well as match rifles that show absolutely no affect when barrel temps (heat also migrates to the action and stock) are elevated to the point of you cannot handle the barrel. In my experience while watching others make this mistake is that when the temp of the chamber does rise considerably many people will chamber a round and leave it for a period of time while they adjust the rifle in the rest to shoot. This is not a good thing because as the round heats the powder being at an elevated temperature compared to the previous rounds will have a higher pressure therefore a different pressure curve causing the bullet to have a different POI and this will be especially apparent at longer ranges evidenced by vertical dispersion. The argument about hot barrels and throat erosion is an old debate that some believe in others do not. The testing results on a 6ppc that were conducted by a friend of mine and a well known shooter and Smith shows it to be of little concern with that specific cartridge. This testing was done on non factory barrels FWIW. [/QUOTE]
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Accuracy of a hot barrel?
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