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Rifles, Reloading, Optics, Equipment
Reloading
Measuring base of case to bullet ogive
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<blockquote data-quote="mtang45" data-source="post: 514401" data-attributes="member: 4224"><p>Kevin,</p><p></p><p>Thanks for the input. I'm speaking strictly of reloaded ammo and yes, your example of the 30 cal 168 grain Hornady vs Sierra or Berger is exactly what I am wrestling with. I understand that the ogive will move on the projectile based on each manufacturer's design differences, but why does the measurement from the base of the case to where the projectile ogive touches the lands change from Hornady to Sierra to Berger? </p><p></p><p>Perhaps I don't fully understand the ogive; my understanding is that it is the location on the projectile, where the diameter is identical to the inside diameter of the lands; and thus the location of initial contact. It is this location that is measured from the base of the case to determine how far the projectile jumps before contacting the lands. When reloading a 30 cal 168 grain Hornady "jammed" against the lands at xxx dimension, why doesn't this same dimension work for Berger and Sierra? Because really all that we are measuring is the distance from the bolt face to the beginning of the lands and that should be a constant.</p><p></p><p>Sorry to be a little thick headed, but I don't understand.</p></blockquote><p></p>
[QUOTE="mtang45, post: 514401, member: 4224"] Kevin, Thanks for the input. I'm speaking strictly of reloaded ammo and yes, your example of the 30 cal 168 grain Hornady vs Sierra or Berger is exactly what I am wrestling with. I understand that the ogive will move on the projectile based on each manufacturer's design differences, but why does the measurement from the base of the case to where the projectile ogive touches the lands change from Hornady to Sierra to Berger? Perhaps I don't fully understand the ogive; my understanding is that it is the location on the projectile, where the diameter is identical to the inside diameter of the lands; and thus the location of initial contact. It is this location that is measured from the base of the case to determine how far the projectile jumps before contacting the lands. When reloading a 30 cal 168 grain Hornady "jammed" against the lands at xxx dimension, why doesn't this same dimension work for Berger and Sierra? Because really all that we are measuring is the distance from the bolt face to the beginning of the lands and that should be a constant. Sorry to be a little thick headed, but I don't understand. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Measuring base of case to bullet ogive
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