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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Severely Overbore Chartidges and short barrel life myths...
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<blockquote data-quote="Fiftydriver" data-source="post: 428932" data-attributes="member: 10"><p>Elkslayer,</p><p> </p><p>Generally, if I get vertical stringing, I will seat the bullets to the lands and see what happens. Most times it will tighten up but this is not written in stone. Other times you need to go the other way. This is mainly with factory rifles. With match barrels and tight throats, I have found that OAL has very little to do with velocity spreads or accuracy results but you must remember that my throats are no more then 1/2 thou over bullet diameter and its common to chamber a loaded round, eject it and see where the throat has rubbed around the bullet when chambered because the throat is this tightly matched to the bullet.</p><p> </p><p>This does not allow the bullet to get out of alignment with the bore and as such, oal is not as critical nor does it seem to vary accuracy as much.</p><p> </p><p>Now a factory barrel, 50 thou can make a HUGE difference in accuracy.</p><p> </p><p>Important thing it to change one thing at a time so you know what makes a difference.</p><p> </p><p>Remember back in my load development post, when I shoot 4-5 shots over the chrono, for the most part, that right there will tell me if I am going to see any vertical stringing and how much I can expect.</p><p> </p><p>I have also learned that when LR shooting, if you get vertical stringing, one of the first things you should do is check your baring surface consistancy of your bullets. If needed sort them so they are all the same baring surface length. This can make a big difference.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 428932, member: 10"] Elkslayer, Generally, if I get vertical stringing, I will seat the bullets to the lands and see what happens. Most times it will tighten up but this is not written in stone. Other times you need to go the other way. This is mainly with factory rifles. With match barrels and tight throats, I have found that OAL has very little to do with velocity spreads or accuracy results but you must remember that my throats are no more then 1/2 thou over bullet diameter and its common to chamber a loaded round, eject it and see where the throat has rubbed around the bullet when chambered because the throat is this tightly matched to the bullet. This does not allow the bullet to get out of alignment with the bore and as such, oal is not as critical nor does it seem to vary accuracy as much. Now a factory barrel, 50 thou can make a HUGE difference in accuracy. Important thing it to change one thing at a time so you know what makes a difference. Remember back in my load development post, when I shoot 4-5 shots over the chrono, for the most part, that right there will tell me if I am going to see any vertical stringing and how much I can expect. I have also learned that when LR shooting, if you get vertical stringing, one of the first things you should do is check your baring surface consistancy of your bullets. If needed sort them so they are all the same baring surface length. This can make a big difference. [/QUOTE]
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Severely Overbore Chartidges and short barrel life myths...
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