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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: 844984" data-attributes="member: 25383"><p>some folks say the hottest point of the ignition is at the T.P. Can't prove it by me, as I simply don't know. But longer necks are well known to be beneficial, and short necks are not. I think that the grand idea that very long necks help guide the bullet into the lands is somewhat over stated, but it does a little.</p><p> </p><p>Peak pressure should not occur when the primer goes off, but as the bullet strikes the riffling. The gas pressure is at it's peak and then pretty much squares itself with the increased resistance from the riffling. This all occurs in milliseconds. The powder burn continues as the bullet enters the lands, and may go all the way out to the end of the barrel. Depending of course on the case capacity. You take a small case like the .250 Savage using a .257" bullet, and I doubt there much burn inside the barrel. Yet you take a 25-06 or a .257 WBY mag, and you see a different ball game. I'd guess the powder burn is at least half way thru the barrel with some of the slower burn rates. Yet as the bullet passes thru the barrel the increased volume of the gas cylinder pushing it will in turn decrease in pressure. A given cubic inches of gas under a given pressure in a given volume will decrease as the cubic inches of volume increases. That's one of the laws of pneumatics. </p><p> </p><p>Proponents of longer necked cases have long included a lot of well respected shooters from the past. You can add folks like Mike Walker, P.O. Ackley, Ferris Pindell, M.L. McPherson over the last thirty years or so. People tend to listen to what those folks say or did say. Yet each of these guys differed from the others in their thoughts and ideas otherwise. Ackley was big on the 40 degree shoulder angle, but the others were not. Ackley was big on getting a complete powder burn, and for the most the others are as well. Walker liked a caliber and a half if possible for the neck length. The others were a little less in length, but still long neck proponents. </p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 844984, member: 25383"] some folks say the hottest point of the ignition is at the T.P. Can't prove it by me, as I simply don't know. But longer necks are well known to be beneficial, and short necks are not. I think that the grand idea that very long necks help guide the bullet into the lands is somewhat over stated, but it does a little. Peak pressure should not occur when the primer goes off, but as the bullet strikes the riffling. The gas pressure is at it's peak and then pretty much squares itself with the increased resistance from the riffling. This all occurs in milliseconds. The powder burn continues as the bullet enters the lands, and may go all the way out to the end of the barrel. Depending of course on the case capacity. You take a small case like the .250 Savage using a .257" bullet, and I doubt there much burn inside the barrel. Yet you take a 25-06 or a .257 WBY mag, and you see a different ball game. I'd guess the powder burn is at least half way thru the barrel with some of the slower burn rates. Yet as the bullet passes thru the barrel the increased volume of the gas cylinder pushing it will in turn decrease in pressure. A given cubic inches of gas under a given pressure in a given volume will decrease as the cubic inches of volume increases. That's one of the laws of pneumatics. Proponents of longer necked cases have long included a lot of well respected shooters from the past. You can add folks like Mike Walker, P.O. Ackley, Ferris Pindell, M.L. McPherson over the last thirty years or so. People tend to listen to what those folks say or did say. Yet each of these guys differed from the others in their thoughts and ideas otherwise. Ackley was big on the 40 degree shoulder angle, but the others were not. Ackley was big on getting a complete powder burn, and for the most the others are as well. Walker liked a caliber and a half if possible for the neck length. The others were a little less in length, but still long neck proponents. gary [/QUOTE]
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short necks.....what problem?
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