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Rifles, Reloading, Optics, Equipment
Reloading
Ackley Improved Education
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<blockquote data-quote="MagnumManiac" data-source="post: 3069189" data-attributes="member: 10755"><p>I think you are missing the point here. Improved cases are not done for a velocity increase, it is done to improve all aspects of old tapered cases that have been plagued by these body tapers with excessive stretching and difficulty keeping the brass consistent, when it moves this much, it is very difficult to size precisely and it is all over the place.</p><p>The 375H&H is a prime example, 3-5 shots and that case has already required trimming after every shot. The Weatherby has no such problem and the brass doesn't stretch and become a PITA to size consistently.</p><p>Ammo makers want their OWN designs so they can hype them up and make rifle/ammo sales by introducing NEW stuff. The AI on existing cases isn't enough of an incentive.</p><p>My own wildcats have 30°, 35°, 40° & 45° shoulders, the reason is that these angles have proven to slow throat erosion, as calibre increases, the shoulder angle reduces because the bore is getting larger and a steep angle no longer works as efficiently. Throat length also has to change with bore diameter.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 3069189, member: 10755"] I think you are missing the point here. Improved cases are not done for a velocity increase, it is done to improve all aspects of old tapered cases that have been plagued by these body tapers with excessive stretching and difficulty keeping the brass consistent, when it moves this much, it is very difficult to size precisely and it is all over the place. The 375H&H is a prime example, 3-5 shots and that case has already required trimming after every shot. The Weatherby has no such problem and the brass doesn’t stretch and become a PITA to size consistently. Ammo makers want their OWN designs so they can hype them up and make rifle/ammo sales by introducing NEW stuff. The AI on existing cases isn’t enough of an incentive. My own wildcats have 30°, 35°, 40° & 45° shoulders, the reason is that these angles have proven to slow throat erosion, as calibre increases, the shoulder angle reduces because the bore is getting larger and a steep angle no longer works as efficiently. Throat length also has to change with bore diameter. Cheers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Ackley Improved Education
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