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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
short necks.....what problem?
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<blockquote data-quote="Trickymissfit" data-source="post: 844183" data-attributes="member: 25383"><p>thoughts:</p><p> </p><p>* longer necks tend to help contain the T.P. inside the neck (but not always). You also must figure in the shoulder angle as well.</p><p> </p><p>* longer necks do seem to help guide the bullet into the throat a little better. How much is debatable, but it does help.</p><p> </p><p>* ideally a case design will have 1.5 calibers of neck, but most get by with a caliber or slightly more. In other words a 6mm will want a .243" neck length minimum, but the better ones are using lengths that are in the .30" to .35" area. Still a .25" neck length and a 20 degree shoulder will produce a short throat life as it places the TP in the throat. Yet the same neck with a 40 degree shoulder will place the TP right near the case lip. Somewhat better! But the same case with a .30" neck and a 30 degree shoulder is about ideal. Plus the 30 degree neck produces better gas flow than the forty degree neck.</p><p> </p><p>* The one other serious issue with a short neck verses a longer neck is bullet placement inside the neck. Short necks often have the bullet seated well into the shoulder area when using very long high BC bullets. They also have another issue with very short bullets in that you can't seat them out as far, but that's usually an issue with factory chambers alone. Still if your chamber is cut for a high BC bullet that's long; you'll have issues with the short bullets. And of course vise versa.</p><p> </p><p>* There are a couple other arguments in the short verses long neck concept, but I'm not digging that one up from the grave. I shoot both long and short necks, and know their demons. </p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 844183, member: 25383"] thoughts: * longer necks tend to help contain the T.P. inside the neck (but not always). You also must figure in the shoulder angle as well. * longer necks do seem to help guide the bullet into the throat a little better. How much is debatable, but it does help. * ideally a case design will have 1.5 calibers of neck, but most get by with a caliber or slightly more. In other words a 6mm will want a .243" neck length minimum, but the better ones are using lengths that are in the .30" to .35" area. Still a .25" neck length and a 20 degree shoulder will produce a short throat life as it places the TP in the throat. Yet the same neck with a 40 degree shoulder will place the TP right near the case lip. Somewhat better! But the same case with a .30" neck and a 30 degree shoulder is about ideal. Plus the 30 degree neck produces better gas flow than the forty degree neck. * The one other serious issue with a short neck verses a longer neck is bullet placement inside the neck. Short necks often have the bullet seated well into the shoulder area when using very long high BC bullets. They also have another issue with very short bullets in that you can't seat them out as far, but that's usually an issue with factory chambers alone. Still if your chamber is cut for a high BC bullet that's long; you'll have issues with the short bullets. And of course vise versa. * There are a couple other arguments in the short verses long neck concept, but I'm not digging that one up from the grave. I shoot both long and short necks, and know their demons. gary [/QUOTE]
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short necks.....what problem?
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