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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: 106651" data-attributes="member: 10"><p>Gonehuntingagain,</p><p></p><p>If the rifle likes the 168 gr bullets then I would say what I say to all of my customers, "A rifle is like a beautiful women, give her what she likes and your life will be great, give her what "YOU" like and things will go bad quickly!"</p><p></p><p>Translated to rifle talk, shoot the bullet that the rifle likes and don;t bother with ones YOU want to shoot.</p><p></p><p>It may simply be an issue with stability at the velocities you are getting with the 308 and the 180 gr accubonds. May also be some issues with bore diameter being a bit loose and the solid head of the Accubond not bumping up to seal the bore which can cause some odd fliers at times.</p><p></p><p>Again, if this is the case, higher chamber pressure will generally help tighten groups because it kicks the bullet base harder with higher pressure and bumps it up more.</p><p></p><p>With the Accubond though, its solid head prevents most of this bump up so you basically get what you get, not like a cup jacketed bullet.</p><p></p><p>I would still recommend lapping the lugs but I much prefer to pull the barrel and do so. This way you can keep an eye on the amount you set the bolt back for headspace purposes. </p><p></p><p>I would not lap off more then a couple thou at the most. You can take this amount off and still not have major issues with headspace in most factory rifles. Most are so darn loose it hardly matters anyway but I do not recommend going over 2 thou lapping the lugs unless you will set the barrel back.</p><p></p><p>2 thou off the lugs is actually quite a bit. You will see most lugs come into at least 75% contact with 1 to 1.5 thou lapped off the lugs.</p><p></p><p>As far as if it is worth it to set the barrel back and rechamber, thats a personal decision, professionally, I do not like recommending that proceedure for one simple reason, your still left with the factory barrel.</p><p></p><p>If the only thing wrong with the rifle is that the factory barrel is the problem with accuracy, you can bump $500 into the rifle to true up machining and still be left with results pretty much the same as when you started.</p><p></p><p>Sometimes the results are very good, most times there is some measurable improvement in consistancy but there are other times where nothing improves using the factory barrel. Its hard to tell your customer to pay his bill when the rifle shoots the same as it did when he brought it to you!!!</p><p></p><p>For this reason, I generally only recommend minor things when the factory barrel will be retained on the rifle. Lapping lugs slightly, bedding, recrowning, trigger jobs and such are easy to do and generally relatively inexpensive as well.</p><p></p><p>Much more then those steps and I really recommend investing in a quality barrel and giving the rifle a total makeover. The improvement in performance to the cost in dollars increases DRAMATICALLY with a new barrel and a fully accurized receiver. </p><p></p><p>Yes it costs more, several hundred dollars more, but in the end, I have yet to have anyone complain about a properly reworked rifle.</p><p></p><p>Simply put, if your 308 likes the 168 gr bullets, listen to her!!! Rifles are very blunt with what they like, especially factory rifles, give em what they want.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 106651, member: 10"] Gonehuntingagain, If the rifle likes the 168 gr bullets then I would say what I say to all of my customers, "A rifle is like a beautiful women, give her what she likes and your life will be great, give her what "YOU" like and things will go bad quickly!" Translated to rifle talk, shoot the bullet that the rifle likes and don;t bother with ones YOU want to shoot. It may simply be an issue with stability at the velocities you are getting with the 308 and the 180 gr accubonds. May also be some issues with bore diameter being a bit loose and the solid head of the Accubond not bumping up to seal the bore which can cause some odd fliers at times. Again, if this is the case, higher chamber pressure will generally help tighten groups because it kicks the bullet base harder with higher pressure and bumps it up more. With the Accubond though, its solid head prevents most of this bump up so you basically get what you get, not like a cup jacketed bullet. I would still recommend lapping the lugs but I much prefer to pull the barrel and do so. This way you can keep an eye on the amount you set the bolt back for headspace purposes. I would not lap off more then a couple thou at the most. You can take this amount off and still not have major issues with headspace in most factory rifles. Most are so darn loose it hardly matters anyway but I do not recommend going over 2 thou lapping the lugs unless you will set the barrel back. 2 thou off the lugs is actually quite a bit. You will see most lugs come into at least 75% contact with 1 to 1.5 thou lapped off the lugs. As far as if it is worth it to set the barrel back and rechamber, thats a personal decision, professionally, I do not like recommending that proceedure for one simple reason, your still left with the factory barrel. If the only thing wrong with the rifle is that the factory barrel is the problem with accuracy, you can bump $500 into the rifle to true up machining and still be left with results pretty much the same as when you started. Sometimes the results are very good, most times there is some measurable improvement in consistancy but there are other times where nothing improves using the factory barrel. Its hard to tell your customer to pay his bill when the rifle shoots the same as it did when he brought it to you!!! For this reason, I generally only recommend minor things when the factory barrel will be retained on the rifle. Lapping lugs slightly, bedding, recrowning, trigger jobs and such are easy to do and generally relatively inexpensive as well. Much more then those steps and I really recommend investing in a quality barrel and giving the rifle a total makeover. The improvement in performance to the cost in dollars increases DRAMATICALLY with a new barrel and a fully accurized receiver. Yes it costs more, several hundred dollars more, but in the end, I have yet to have anyone complain about a properly reworked rifle. Simply put, if your 308 likes the 168 gr bullets, listen to her!!! Rifles are very blunt with what they like, especially factory rifles, give em what they want. Kirby Allen(50) [/QUOTE]
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Bolt Lug Contact & how it effects groups
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