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Rifles, Reloading, Optics, Equipment
Reloading
Barrel Cooling During Load/Group Development
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<blockquote data-quote="AZShooter" data-source="post: 1002688" data-attributes="member: 5219"><p>I have encountered barrel walking from time to time. If the chambering isn't some big magnum it would be interesting to shoot 5 to 8 in a row to see what happens. My 1000 yd bench rest friends will shoot up to 6 shots THEN go for their record group. The idea besides verifying the POI is if there is any barrel movement due to heat it will have moved to the final location. </p><p></p><p>I helped a friend get his 6.5-284 shooting last year.(the barrel was cryogenically frozen) It would shoot fantastic three shot groups then the group would walk. One time I shot 8 in a row and the last five were in a cluster under 1/4" just 3/8" away from original POI. </p><p></p><p> I know a well known rifle maker here in Tucson who only shoots the first shot then lets it cool to ambient and repeats. Takes a long time but he will know if the first shot is reliable. </p><p></p><p>My favorite test of a hunting rifle is to shoot one shot then let totally cool and shoot one more. Do this for several DIFFERENT range sessions then superimpose all targets to see the real group size. If a rifle keeps putting them into a small area it can be trusted. </p><p></p><p>Like HarperC says if it is a hunting rifle don't worry.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1002688, member: 5219"] I have encountered barrel walking from time to time. If the chambering isn't some big magnum it would be interesting to shoot 5 to 8 in a row to see what happens. My 1000 yd bench rest friends will shoot up to 6 shots THEN go for their record group. The idea besides verifying the POI is if there is any barrel movement due to heat it will have moved to the final location. I helped a friend get his 6.5-284 shooting last year.(the barrel was cryogenically frozen) It would shoot fantastic three shot groups then the group would walk. One time I shot 8 in a row and the last five were in a cluster under 1/4" just 3/8" away from original POI. I know a well known rifle maker here in Tucson who only shoots the first shot then lets it cool to ambient and repeats. Takes a long time but he will know if the first shot is reliable. My favorite test of a hunting rifle is to shoot one shot then let totally cool and shoot one more. Do this for several DIFFERENT range sessions then superimpose all targets to see the real group size. If a rifle keeps putting them into a small area it can be trusted. Like HarperC says if it is a hunting rifle don't worry. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Barrel Cooling During Load/Group Development
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