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Long Range Hunting & Shooting
How much does the Point Of Impact shift with your switch barrel rifle when reinstalling a barrel?
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<blockquote data-quote="kai" data-source="post: 1562249" data-attributes="member: 98994"><p>I tested a new series of procedures to improve the consistency of the POI with my .223 barrel and Nucleus action using the ARC BarLoc.</p><p></p><p>Previously I just mounted the barrel to the action while the rifle was on a bipod. I was experiencing POI shifts of 2 to 4 inches with the same barrel. Perhaps because the threads between the barrel and the action fit rather loosely.</p><p></p><p>The new procedures reduced the POI shift to range between .1 inch and 1.1 inch in 4 mountings of the barrel at 100 yards.</p><p></p><p>Here's what I did:</p><ol> <li data-xf-list-type="ol">Held the rifle vertical to eliminate lateral pressure on the barrel and receiver threads.</li> <li data-xf-list-type="ol">Hand screwed the barrel into the receiver until it snugged up against the GO gauge.</li> <li data-xf-list-type="ol">Tightened the barrel nut until the gap in the BarLoc clamp opened to .105 inch wide.</li> <li data-xf-list-type="ol">Tightened the BarLoc screw to 60 inch pounds of torque.</li> </ol><p>The maker of the BarLoc clamp recommended 60 - 90 inch pounds of torque. I'll try increasing the torque to see if it reduces the shift in POI. My FAT torque gauge only has indications up to 65 inch pounds.</p><p></p><p>It's impossible to get the barrel nut to go exactly to the same place on the barrel every time. I was wondering if it would be good (or bad) to permanently affix the barrel nut to the barrel with Locktite or JB Weld so that it acts like a shouldered barrel. That would eliminate the variable of having the barrel nut in a slightly different position on the barrel.</p><p>However, fixing the barrel nut to the barrel would require me to hand tighten the barrel to preload and open up the BarLoc while trying to judge (feel) the engagement of the barrel to the GO gauge.</p><p></p><p>This is my first switch barrel gun, so pardon my ignorance.</p><p></p><p>What do you gents think about the idea of fixing the barrel nut to the barrel?</p><p></p><p>Any other ideas or suggestions for reducing the POI shift are greatly appreciated.</p></blockquote><p></p>
[QUOTE="kai, post: 1562249, member: 98994"] I tested a new series of procedures to improve the consistency of the POI with my .223 barrel and Nucleus action using the ARC BarLoc. Previously I just mounted the barrel to the action while the rifle was on a bipod. I was experiencing POI shifts of 2 to 4 inches with the same barrel. Perhaps because the threads between the barrel and the action fit rather loosely. The new procedures reduced the POI shift to range between .1 inch and 1.1 inch in 4 mountings of the barrel at 100 yards. Here's what I did: [LIST=1] [*]Held the rifle vertical to eliminate lateral pressure on the barrel and receiver threads. [*]Hand screwed the barrel into the receiver until it snugged up against the GO gauge. [*]Tightened the barrel nut until the gap in the BarLoc clamp opened to .105 inch wide. [*]Tightened the BarLoc screw to 60 inch pounds of torque. [/LIST] The maker of the BarLoc clamp recommended 60 - 90 inch pounds of torque. I'll try increasing the torque to see if it reduces the shift in POI. My FAT torque gauge only has indications up to 65 inch pounds. It's impossible to get the barrel nut to go exactly to the same place on the barrel every time. I was wondering if it would be good (or bad) to permanently affix the barrel nut to the barrel with Locktite or JB Weld so that it acts like a shouldered barrel. That would eliminate the variable of having the barrel nut in a slightly different position on the barrel. However, fixing the barrel nut to the barrel would require me to hand tighten the barrel to preload and open up the BarLoc while trying to judge (feel) the engagement of the barrel to the GO gauge. This is my first switch barrel gun, so pardon my ignorance. What do you gents think about the idea of fixing the barrel nut to the barrel? Any other ideas or suggestions for reducing the POI shift are greatly appreciated. [/QUOTE]
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How much does the Point Of Impact shift with your switch barrel rifle when reinstalling a barrel?
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