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Rifles, Reloading, Optics, Equipment
Reloading
Bullet ogive differences
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<blockquote data-quote="fishingstockwell" data-source="post: 1208409" data-attributes="member: 96590"><p>Different bullets have different bearing surfaces. Significant differences in many cases. Some people believe that a shorter bearing surface creates less friction and allows you to push a similar weight bullet to faster speeds with equal pressure. A good example of this is that many people claim they can push the 215 berger hybrid faster than the 210 berger vld because the bearing surface is shorter. I have talked to the technical folks at Berger and they said it is not true, so I doubt .036" longer bearing surface is causing higher pressure problems.</p><p></p><p>It seem more likely that since the O-give is farther forward on some of your bullets, it is closer to, or even on the lands, where the shorter base to o-give bullets are off the lands. Going from near the lands to touching can cause a very big spike in pressure. </p><p></p><p>How far off the lands do you have the bullet set? If you set it at .010 off the lands with one of the short bullets, the longer bullets could be pushed into the lands .026, which would cause you to see a very noticeable change in pressure, particularly if you are near max load. I guess that is assuming that the difference in the bearing surface is on the front and not the at the bowtail. </p><p></p><p>Matt</p></blockquote><p></p>
[QUOTE="fishingstockwell, post: 1208409, member: 96590"] Different bullets have different bearing surfaces. Significant differences in many cases. Some people believe that a shorter bearing surface creates less friction and allows you to push a similar weight bullet to faster speeds with equal pressure. A good example of this is that many people claim they can push the 215 berger hybrid faster than the 210 berger vld because the bearing surface is shorter. I have talked to the technical folks at Berger and they said it is not true, so I doubt .036" longer bearing surface is causing higher pressure problems. It seem more likely that since the O-give is farther forward on some of your bullets, it is closer to, or even on the lands, where the shorter base to o-give bullets are off the lands. Going from near the lands to touching can cause a very big spike in pressure. How far off the lands do you have the bullet set? If you set it at .010 off the lands with one of the short bullets, the longer bullets could be pushed into the lands .026, which would cause you to see a very noticeable change in pressure, particularly if you are near max load. I guess that is assuming that the difference in the bearing surface is on the front and not the at the bowtail. Matt [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Bullet ogive differences
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