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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
? .270
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<blockquote data-quote="Kevin Thomas" data-source="post: 449610" data-attributes="member: 15748"><p>Just a quick aside here, guys; meplat diameter does have a relationship to both bearing surface, weight and ogive length. The reason for this is how they're knocked back out of the die. It's done via a small piece of piano wire rod that comes up through the tip of the die, and contacts the meplat to push it back out of the form die. In other words, the smaller the meplat, the smaller the knockout rod. Once we start getting down to the .060" mark, that's a tiny little rod tying to force a bullet back out of a die, and it may be pretty firmly wedged in there. Match that up with a press that's running 60-80 strokes a minute, and bad things can happen fast. A little too tight, and the rod just crumples, leaving the bullet in the die and subsequently trying to seat another bullet on top of the one that's now stuck. Wrecks the press, may shatter the rather expensive carbide die. If the hollow point is a bit too open, or the jacket a few thou too short, the punch goes up and spears the lead core, again sucking it back into the die and giving you a loud, expensive crunch. </p><p> </p><p>It's a universal problem, and virtually all bullet makers have their own way of dealing wth this. Point is, there's limitations here with the current state of the art technology. As it (the technology) improves, the meplats may become smaller, simple as that.</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 449610, member: 15748"] Just a quick aside here, guys; meplat diameter does have a relationship to both bearing surface, weight and ogive length. The reason for this is how they're knocked back out of the die. It's done via a small piece of piano wire rod that comes up through the tip of the die, and contacts the meplat to push it back out of the form die. In other words, the smaller the meplat, the smaller the knockout rod. Once we start getting down to the .060" mark, that's a tiny little rod tying to force a bullet back out of a die, and it may be pretty firmly wedged in there. Match that up with a press that's running 60-80 strokes a minute, and bad things can happen fast. A little too tight, and the rod just crumples, leaving the bullet in the die and subsequently trying to seat another bullet on top of the one that's now stuck. Wrecks the press, may shatter the rather expensive carbide die. If the hollow point is a bit too open, or the jacket a few thou too short, the punch goes up and spears the lead core, again sucking it back into the die and giving you a loud, expensive crunch. It's a universal problem, and virtually all bullet makers have their own way of dealing wth this. Point is, there's limitations here with the current state of the art technology. As it (the technology) improves, the meplats may become smaller, simple as that. [/QUOTE]
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