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Rifles, Reloading, Optics, Equipment
Reloading
Measuring base of case to bullet ogive
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<blockquote data-quote="Kevin Thomas" data-source="post: 514397" data-attributes="member: 15748"><p>mtang45,</p><p> </p><p>There's a couple of things here that need clarification. If you're comparing different brands or types of bullets, yes, there will definately be variations between them. If you're dealing with different ogives here (which you almost certainly are), then where the seating plug contacts the bullet will affect where it comes to rest with a given die setting.</p><p> </p><p>It almost sounds as if you're checking factory ammo? Or is this a variety of rounds that you've loaded using different components? If so, the fix is obviuous; you need to establish where the throat is and then seat your bullets using that as a reference point. At least from that point, whatever you load of those components should have the same reading. Switch bullets, and you're back to square one. Also, you need to understand that various bullets will show a preference for more or less jump, and that needs to be experimented with a bit to see what that particular combination favors. </p><p> </p><p>OAL is a set number, if you're talking about SAAMI max, or a mag length loading. The point at which a bullet contacts the rifling will vary from bullet type to bullet type. The don't necessarily stay the same, either. A 30 cal 168 grain bullet from Hornady will not have the same dimension as a Sierra or a Berger. As I said, the readings need to be taken in context, with the understanding that that dimension is appropriate for that combination only!</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 514397, member: 15748"] mtang45, There's a couple of things here that need clarification. If you're comparing different brands or types of bullets, yes, there will definately be variations between them. If you're dealing with different ogives here (which you almost certainly are), then where the seating plug contacts the bullet will affect where it comes to rest with a given die setting. It almost sounds as if you're checking factory ammo? Or is this a variety of rounds that you've loaded using different components? If so, the fix is obviuous; you need to establish where the throat is and then seat your bullets using that as a reference point. At least from that point, whatever you load of those components should have the same reading. Switch bullets, and you're back to square one. Also, you need to understand that various bullets will show a preference for more or less jump, and that needs to be experimented with a bit to see what that particular combination favors. OAL is a set number, if you're talking about SAAMI max, or a mag length loading. The point at which a bullet contacts the rifling will vary from bullet type to bullet type. The don't necessarily stay the same, either. A 30 cal 168 grain bullet from Hornady will not have the same dimension as a Sierra or a Berger. As I said, the readings need to be taken in context, with the understanding that that dimension is appropriate for that combination only! [/QUOTE]
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Measuring base of case to bullet ogive
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