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Cold bore shot question.
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<blockquote data-quote="fj40mojo" data-source="post: 432732" data-attributes="member: 19129"><p>As a rule I try to site my rifle in for the cold bore shot and generally my 3 follow up shots will be fairly close. Ultimately though I want to know that that first shot is going to hit the mark. I don't pack rifles that have ultra rigid 1" diameter barrels, but that is one thing that will minimize POI change.</p><p></p><p>There is no such thing as a "likely" POI change. Stresses are imparted to the barrel during the various machining processes. As the barrel warms the stress will cause things to move. Hopefully they will move in a predictable manner. Unless you machine your own barrel you have no control over any of the aspects that impart stress like tool edge, tool pressure, feed rate, coolant, cutting oil, etc, etc. A few years back folks were cryo treating there barrels in an attempt to relive stress and to some degree I heard it worked, never tried myself but the process can be done with a half gallon of liquid nitrogen, a long insulated container and a chest type freezer. you submerge the barreled action in liquid nitrogen inside the insulated container and put it in the chest type freezer until the liquid nitrogen evaporates.</p></blockquote><p></p>
[QUOTE="fj40mojo, post: 432732, member: 19129"] As a rule I try to site my rifle in for the cold bore shot and generally my 3 follow up shots will be fairly close. Ultimately though I want to know that that first shot is going to hit the mark. I don't pack rifles that have ultra rigid 1" diameter barrels, but that is one thing that will minimize POI change. There is no such thing as a "likely" POI change. Stresses are imparted to the barrel during the various machining processes. As the barrel warms the stress will cause things to move. Hopefully they will move in a predictable manner. Unless you machine your own barrel you have no control over any of the aspects that impart stress like tool edge, tool pressure, feed rate, coolant, cutting oil, etc, etc. A few years back folks were cryo treating there barrels in an attempt to relive stress and to some degree I heard it worked, never tried myself but the process can be done with a half gallon of liquid nitrogen, a long insulated container and a chest type freezer. you submerge the barreled action in liquid nitrogen inside the insulated container and put it in the chest type freezer until the liquid nitrogen evaporates. [/QUOTE]
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