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Rifles, Reloading, Optics, Equipment
Reloading
Inconsistent Meplats on Berger 168 (and other weight) bullets
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<blockquote data-quote="barefooter56" data-source="post: 1094448" data-attributes="member: 85389"><p>Sidecarflip,</p><p>These gentlemen are correct. Regarding the OAL difference you are relaying, this is a normal result of the bullet forming process. The amount that a bullet can vary in length can be as much as .020. The reason why this doesn't affect performance in a negative way is important to understand. What we do is when we set up to make a bullet, we know that the OAL may vary as much as .020. So we set the die so that the longest and the shortest of these still has the same meplat (tip) diameter. As long as the meplat(tip) is the same size from bullet to bullet there will be no difference in the drag the bullet produces. Another aspect of this situation is that the more important dimension related to trajectory consistency is the consistent shape of the nose. We make all of our bullets using one die design that when one die is worn out the next one is machined exactly like the last one was when it was new so the nose shapes will be precisely the same. When you seat these bullets into your cases, no matter how long or how short the bullet OAL is the distance from the base of the cartridge case to the point where the bullet engages the rifling will be within a few .001 IF you have not or don't sort the bullets into groups by measuring the base to ogive and making small adjustments to your seating die stem length to compensate for each group. In many cases this dimension will vary no more than .001-.002. These dimensions are the most important in regards to performance.</p></blockquote><p></p>
[QUOTE="barefooter56, post: 1094448, member: 85389"] Sidecarflip, These gentlemen are correct. Regarding the OAL difference you are relaying, this is a normal result of the bullet forming process. The amount that a bullet can vary in length can be as much as .020. The reason why this doesn't affect performance in a negative way is important to understand. What we do is when we set up to make a bullet, we know that the OAL may vary as much as .020. So we set the die so that the longest and the shortest of these still has the same meplat (tip) diameter. As long as the meplat(tip) is the same size from bullet to bullet there will be no difference in the drag the bullet produces. Another aspect of this situation is that the more important dimension related to trajectory consistency is the consistent shape of the nose. We make all of our bullets using one die design that when one die is worn out the next one is machined exactly like the last one was when it was new so the nose shapes will be precisely the same. When you seat these bullets into your cases, no matter how long or how short the bullet OAL is the distance from the base of the cartridge case to the point where the bullet engages the rifling will be within a few .001 IF you have not or don't sort the bullets into groups by measuring the base to ogive and making small adjustments to your seating die stem length to compensate for each group. In many cases this dimension will vary no more than .001-.002. These dimensions are the most important in regards to performance. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Inconsistent Meplats on Berger 168 (and other weight) bullets
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