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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Pros/Cons of 30 vs 40 degree shoulder?
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<blockquote data-quote="cabelasken" data-source="post: 2582714" data-attributes="member: 117774"><p>I used to think that a gentle case slope helped with throat erosion, but now I believe the length of the neck contributes more to minimizing erosion. As the powder kernals (extruded) exit the case, the ones near the bullet are unburned and for a few inches down the barrel act as sandpaper against the throat causing erosion. I think those cases with gentler shoulders keep the kernals traveling more straight and the cases with longer necks will help even more and could help with throat erosion. However, cases like the 280 AI with the 40 degree shoulder seem to deform very little and brass lasts a very long time.</p></blockquote><p></p>
[QUOTE="cabelasken, post: 2582714, member: 117774"] I used to think that a gentle case slope helped with throat erosion, but now I believe the length of the neck contributes more to minimizing erosion. As the powder kernals (extruded) exit the case, the ones near the bullet are unburned and for a few inches down the barrel act as sandpaper against the throat causing erosion. I think those cases with gentler shoulders keep the kernals traveling more straight and the cases with longer necks will help even more and could help with throat erosion. However, cases like the 280 AI with the 40 degree shoulder seem to deform very little and brass lasts a very long time. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Pros/Cons of 30 vs 40 degree shoulder?
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