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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="gonehuntingagain" data-source="post: 106595" data-attributes="member: 1206"><p>[ QUOTE ]</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></p><p>[/ QUOTE ]</p><p></p><p></p><p>Thanks Kirby. I do not intend on selling the rifle, mostly because it is a real pain in the rear to find a left handed rifle, and then who knows what I would end up with. I would like to have it trued/blueprinted (eventually). I have been shooting Nosler 168gr J4's using mil-surp WC844 powder (not the most consitant stuff in the world) and have not seen a pattern like this. </p><p>I have also tried <a href="http://myweb.cableone.net/abraden/images/Hunting/IMR4350_308_Group.jpg" target="_blank">IMR 4350/168 J4s</a> with the rifle to see what it would do and it wasn't too bad. </p><p></p><p>You saw the bolt lugs correctly, they both appear to be contacting with about 1/3 or less of the bottom of each lug. I know it would be well worth my money to have the receiver trued, but would it be worth it to have the barrel set back and rechambered true, assuming the bore is centered in the barrel (since I don't have the funds available for a new barrel)?</p><p></p><p>Since the groups started to get better at higher loads, and there were NO signs of pressure issues, I am going to try a couple of loads at .1gr and .2gr over max listed just to see if the group tightens up any. </p><p></p><p>I thought of doing the valve grinding compound or JB bore scrub approach to lap the lugs, but I figured that it would be only a band-aid to the problem. Heck, maybe my rifle just doesn't like Varget and/or the 180gr AB's</p><p></p><p>Roy - it tried rather weakly to snow Sunday morning for a few minutes then all you had to do was wait 5 minutes and the weather would change - all day long...Today added a little hail. It looked like it snowed like mad in the mountains though. One ski resort already announced they had enough snow to stay open until late May. If the weather gets good this weekend it will be time to blast some chucks.</p></blockquote><p></p>
[QUOTE="gonehuntingagain, post: 106595, member: 1206"] [ QUOTE ] 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? [/ QUOTE ] Thanks Kirby. I do not intend on selling the rifle, mostly because it is a real pain in the rear to find a left handed rifle, and then who knows what I would end up with. I would like to have it trued/blueprinted (eventually). I have been shooting Nosler 168gr J4's using mil-surp WC844 powder (not the most consitant stuff in the world) and have not seen a pattern like this. I have also tried [url="http://myweb.cableone.net/abraden/images/Hunting/IMR4350_308_Group.jpg"]IMR 4350/168 J4s[/url] with the rifle to see what it would do and it wasn't too bad. You saw the bolt lugs correctly, they both appear to be contacting with about 1/3 or less of the bottom of each lug. I know it would be well worth my money to have the receiver trued, but would it be worth it to have the barrel set back and rechambered true, assuming the bore is centered in the barrel (since I don't have the funds available for a new barrel)? Since the groups started to get better at higher loads, and there were NO signs of pressure issues, I am going to try a couple of loads at .1gr and .2gr over max listed just to see if the group tightens up any. I thought of doing the valve grinding compound or JB bore scrub approach to lap the lugs, but I figured that it would be only a band-aid to the problem. Heck, maybe my rifle just doesn't like Varget and/or the 180gr AB's Roy - it tried rather weakly to snow Sunday morning for a few minutes then all you had to do was wait 5 minutes and the weather would change - all day long...Today added a little hail. It looked like it snowed like mad in the mountains though. One ski resort already announced they had enough snow to stay open until late May. If the weather gets good this weekend it will be time to blast some chucks. [/QUOTE]
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Bolt Lug Contact & how it effects groups
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