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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
264 Win Mag VS 270 Whby
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<blockquote data-quote="Trickymissfit" data-source="post: 667159" data-attributes="member: 25383"><p>as old Bill Calfee once said, the best way to shoot great groups starts with a great barrel. Ferris Pendell and a few others have said exactly the samething. Now barrel life and throat errsion has a lot more to do with case design than much of anything else. Parker Ackley expounded on this a lot during his lifetime, and the cause has been taken up several times in Precision Shooting and a few other places. If the votex of the flame path enters the throat area, you will have a short barrel life. This isn't some "internet idea", but from folks a lot smarter than us and has been proven out almost daily.</p><p> </p><p>Ackley states in his book (page 165 thru 175 Vol. II) that an overbore cartridge pushes unburnt powder down the barrel, and literally eats the inside of the bore with grains of powder. It was either Bob Greanleaf or M.L. McPherson that wrote about these same issues thirty years later in P.S., and there was nobody arguing with him about it. As I said the essay about the Turbulance Point should be a must read. You get into your CAD program, and make a drawing of the case, and extend the shoulder angles to where they cross. That's the T.P., and also the hottest part of the powder burn. If it ends up in the throat, you shorten the barrel life. You add this into the equation, and you get a very short barrel life. The idea is to have the hottest point of the burn in the first 2/3rds or 3/4 of the neck, not in the throat</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 667159, member: 25383"] as old Bill Calfee once said, the best way to shoot great groups starts with a great barrel. Ferris Pendell and a few others have said exactly the samething. Now barrel life and throat errsion has a lot more to do with case design than much of anything else. Parker Ackley expounded on this a lot during his lifetime, and the cause has been taken up several times in Precision Shooting and a few other places. If the votex of the flame path enters the throat area, you will have a short barrel life. This isn't some "internet idea", but from folks a lot smarter than us and has been proven out almost daily. Ackley states in his book (page 165 thru 175 Vol. II) that an overbore cartridge pushes unburnt powder down the barrel, and literally eats the inside of the bore with grains of powder. It was either Bob Greanleaf or M.L. McPherson that wrote about these same issues thirty years later in P.S., and there was nobody arguing with him about it. As I said the essay about the Turbulance Point should be a must read. You get into your CAD program, and make a drawing of the case, and extend the shoulder angles to where they cross. That's the T.P., and also the hottest part of the powder burn. If it ends up in the throat, you shorten the barrel life. You add this into the equation, and you get a very short barrel life. The idea is to have the hottest point of the burn in the first 2/3rds or 3/4 of the neck, not in the throat gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
264 Win Mag VS 270 Whby
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