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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bolt Lug Contact & how it effects groups
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<blockquote data-quote="Fiftydriver" data-source="post: 106550" data-attributes="member: 10"><p>With an opposing bolt lug design like most modern bolt actions such as the Rem 700, uneven bolt lug contact will usually present itself in vertical stringing. Generally this stringing increases the higher the pressure gets in the load but this is when one lug contacts solidly and the other is floating.</p><p></p><p>as the chamber pressure increases to the point where the bolt will be flexed this is where the stringing begins to get severe in some cases.</p><p></p><p>With your rifle, its hard to tell from pics but it appears that only two small portions of the lugs are contacting which dies seem a little odd just from a machining point of view.</p><p></p><p>If this is the case you may see inconsistant fliers in all directions as you are seeing. I would get the lugs trued and lapped and see what that does for your consistancy.</p><p></p><p>One note of caution, if this area of the rifle is this poorly fitted, it may be just the start to the problems in the rifles machining. I would not dump alot of money into this rifle unless you are going to rebarrel and accurize the receiver and make sure the machining is correct from the start.</p><p></p><p>Remember the rifle has alot more resale value as it comes from the factory so if some simple cures do not solve your problem I would recommend that you either decide to rebuild the rifle correctly or trade her off for a new stick before you loose the resale value by converting the rifle.</p><p></p><p>If this the only bullet you have shot in the rifle? Is there a pattern with other bullets?</p><p></p><p>The 308 should not be that hard to get to shoot well and while your playing with 1 moa, its not really want your looking for in a rifle like this.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 106550, member: 10"] With an opposing bolt lug design like most modern bolt actions such as the Rem 700, uneven bolt lug contact will usually present itself in vertical stringing. Generally this stringing increases the higher the pressure gets in the load but this is when one lug contacts solidly and the other is floating. as the chamber pressure increases to the point where the bolt will be flexed this is where the stringing begins to get severe in some cases. With your rifle, its hard to tell from pics but it appears that only two small portions of the lugs are contacting which dies seem a little odd just from a machining point of view. If this is the case you may see inconsistant fliers in all directions as you are seeing. I would get the lugs trued and lapped and see what that does for your consistancy. One note of caution, if this area of the rifle is this poorly fitted, it may be just the start to the problems in the rifles machining. I would not dump alot of money into this rifle unless you are going to rebarrel and accurize the receiver and make sure the machining is correct from the start. Remember the rifle has alot more resale value as it comes from the factory so if some simple cures do not solve your problem I would recommend that you either decide to rebuild the rifle correctly or trade her off for a new stick before you loose the resale value by converting the rifle. If this the only bullet you have shot in the rifle? Is there a pattern with other bullets? The 308 should not be that hard to get to shoot well and while your playing with 1 moa, its not really want your looking for in a rifle like this. Good Shooting!! Kirby Allen(50) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Bolt Lug Contact & how it effects groups
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