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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet Bearing Surface Length Question(s)
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<blockquote data-quote="Fiftydriver" data-source="post: 267911" data-attributes="member: 10"><p>I sort by +/-0.001 thou. Once you find the mean of the lot of bullets you have, if they are good quality, most often 80-90% of them will fall within this range. The reason I will reserve for fouling shots.</p><p> </p><p>I have found it interesting that the more extreme a chambering is, the more baring surface will show up down range. WHen I was shooting the 200 gr ULD RBBT Wildcat bullet in my 7mm AM loaded to just under 3300 fps.</p><p> </p><p>At 500 yards, there was no real difference in impact no matter what the baring surface variation was, within reason.</p><p> </p><p>At 1/2 mile you could start to see the effects of it if bullets were not sorted by BSL. At 1000 yards, you could cut groups by 1/2 moa by shooting sorted bullets. At 1500 yards, it could be easily 1 moa veritical stringing.</p><p> </p><p>That said, in a 270 Allen Xpress(300 Dakota) and the 169.5 gr ULD RBBT, there was not nearly as noticable stringing, even with same BSL variation........</p><p> </p><p>This brings me to the following conclusions:</p><p> </p><p>A. The shorter the baring surface length, the less effect this variation will have down range.</p><p> </p><p>B. The lower the expansion ratio of a given cartridge, the more baring surface variation will effect down range stringing. </p><p> </p><p>Now this certainly may not be the case in every situation but its repeated itself enough to make me believe it.</p><p> </p><p>Simply put, sorting by BSL is easy to do, why not do it just because.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 267911, member: 10"] I sort by +/-0.001 thou. Once you find the mean of the lot of bullets you have, if they are good quality, most often 80-90% of them will fall within this range. The reason I will reserve for fouling shots. I have found it interesting that the more extreme a chambering is, the more baring surface will show up down range. WHen I was shooting the 200 gr ULD RBBT Wildcat bullet in my 7mm AM loaded to just under 3300 fps. At 500 yards, there was no real difference in impact no matter what the baring surface variation was, within reason. At 1/2 mile you could start to see the effects of it if bullets were not sorted by BSL. At 1000 yards, you could cut groups by 1/2 moa by shooting sorted bullets. At 1500 yards, it could be easily 1 moa veritical stringing. That said, in a 270 Allen Xpress(300 Dakota) and the 169.5 gr ULD RBBT, there was not nearly as noticable stringing, even with same BSL variation........ This brings me to the following conclusions: A. The shorter the baring surface length, the less effect this variation will have down range. B. The lower the expansion ratio of a given cartridge, the more baring surface variation will effect down range stringing. Now this certainly may not be the case in every situation but its repeated itself enough to make me believe it. Simply put, sorting by BSL is easy to do, why not do it just because. [/QUOTE]
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Bullet Bearing Surface Length Question(s)
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