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Rifles, Reloading, Optics, Equipment
Gunsmithing
Truth to longer necks improving barrel life?
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<blockquote data-quote="BallisticsGuy" data-source="post: 2038677" data-attributes="member: 96226"><p>What follows is, as far as I'm concerned, merely lore though I've seen the predictions of this little bit of wisdom to be true. I just cannot assert that it is in fact true. Perhaps someone with advanced education in the area can opine on that:</p><p></p><p>From what I've always been given to understand, it's not just length. The shoulder angle plays a part there and affects how long the neck "should" be. If you draw a line extending parallel with the shoulder from the shoulder of each side through where the neck would be and note where the lines intersect, you're seeing where the plasma jet of burning gunpowder is going to cone out and get most intense. So, a .243win with a lopey 20deg shoulder puts the intersection outside the case neck while a .243AI puts the intersection inside the case neck. The difference betwen the two is the .243AI has a sharper shoulder which allows a shorter neck. My testing on this has not been exceedingly scientific but, I've burned the heck out of the throat of a .243win barrel in 1000 rounds. My last .243AI went 80% longer than that and I shot it faster and loaded it hotter. </p><p></p><p>It makes sense logically but fluid dynamics are usually non-intuitive at best so what seems like logic doesn't always work and why I consider the above to be useful lore.</p></blockquote><p></p>
[QUOTE="BallisticsGuy, post: 2038677, member: 96226"] What follows is, as far as I'm concerned, merely lore though I've seen the predictions of this little bit of wisdom to be true. I just cannot assert that it is in fact true. Perhaps someone with advanced education in the area can opine on that: From what I've always been given to understand, it's not just length. The shoulder angle plays a part there and affects how long the neck "should" be. If you draw a line extending parallel with the shoulder from the shoulder of each side through where the neck would be and note where the lines intersect, you're seeing where the plasma jet of burning gunpowder is going to cone out and get most intense. So, a .243win with a lopey 20deg shoulder puts the intersection outside the case neck while a .243AI puts the intersection inside the case neck. The difference betwen the two is the .243AI has a sharper shoulder which allows a shorter neck. My testing on this has not been exceedingly scientific but, I've burned the heck out of the throat of a .243win barrel in 1000 rounds. My last .243AI went 80% longer than that and I shot it faster and loaded it hotter. It makes sense logically but fluid dynamics are usually non-intuitive at best so what seems like logic doesn't always work and why I consider the above to be useful lore. [/QUOTE]
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Truth to longer necks improving barrel life?
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