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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bore Capacity versus Barrel Life
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<blockquote data-quote="Trickymissfit" data-source="post: 1153358" data-attributes="member: 25383"><p>Ackley wrote some similar things many years back, and a couple others wrote about the issue long before he did. The data Bart supplied came about much later than Parker's, and is probably a little better. (never going to take much of anything away from Parker Ackley).</p><p></p><p>With the above aside, we must realize that we are also dealing with a generic case length and shape. Case shape has a lot to do with case life just like core capacity and even burn rates. A fine example is the long favorite .243 Winchester compared to the 6mm Remington. The Remington case will always have a longer barrel life due to the shape of the shoulder and neck length. When one checks the turbulence point (I prefer the vortex of the flame point), the T.P. of the .243 ends up being just beyond the lip of the neck. While the Remington puts it inside the neck. The data fails to show this. Now I'm not a fan boy of the 40 degree shoulder as it creates it's own set of issues. I like the 30 degree or even the 35 degree shoulder much better. Yet I'd prefer the standard .243 case with a 30 degree shoulder with a .350" neck length (HLS?) Still if I could have my own design, it would be a stretched 6BR that would have the shoulder length of something like a .250 Savage or the .243 Winchester. I think we'd see a 3000 shot barrel life.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 1153358, member: 25383"] Ackley wrote some similar things many years back, and a couple others wrote about the issue long before he did. The data Bart supplied came about much later than Parker's, and is probably a little better. (never going to take much of anything away from Parker Ackley). With the above aside, we must realize that we are also dealing with a generic case length and shape. Case shape has a lot to do with case life just like core capacity and even burn rates. A fine example is the long favorite .243 Winchester compared to the 6mm Remington. The Remington case will always have a longer barrel life due to the shape of the shoulder and neck length. When one checks the turbulence point (I prefer the vortex of the flame point), the T.P. of the .243 ends up being just beyond the lip of the neck. While the Remington puts it inside the neck. The data fails to show this. Now I'm not a fan boy of the 40 degree shoulder as it creates it's own set of issues. I like the 30 degree or even the 35 degree shoulder much better. Yet I'd prefer the standard .243 case with a 30 degree shoulder with a .350" neck length (HLS?) Still if I could have my own design, it would be a stretched 6BR that would have the shoulder length of something like a .250 Savage or the .243 Winchester. I think we'd see a 3000 shot barrel life. gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bore Capacity versus Barrel Life
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