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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.257 Wby --> .25-06 AI
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<blockquote data-quote="Trickymissfit" data-source="post: 462211" data-attributes="member: 25383"><p>you just answered the problem in your reply. The doghnut dosn't just come about over night. The difference between a 35 degree shoulder and a 40 degree shoulder would be nill if any at all. Sometimes it's cause by dies overworking the brass just like it can for firing cases. When you push a case thru a die the excessive metal has to go someplace. If your using a very tight die or bushing it will simply push the metal backwards into the shoulder area. But is also cause by brass flow going the otherway. As I said I shoot several 40 degree cases and get about ten firings before ever seeing a sign of the doughnut. To be exact, with a 40 degree shoulder I rarely trim cases because the brass flow is not there like a 25 degree case. </p><p> </p><p> By the way there is no such thing as a 260 Ackley. Never has and never will be as he was dead long before the round came about. Ackley also has said that the .308 case was not worth the time to improve more than once, and that's where the 260 case evolved from.</p><p> gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 462211, member: 25383"] you just answered the problem in your reply. The doghnut dosn't just come about over night. The difference between a 35 degree shoulder and a 40 degree shoulder would be nill if any at all. Sometimes it's cause by dies overworking the brass just like it can for firing cases. When you push a case thru a die the excessive metal has to go someplace. If your using a very tight die or bushing it will simply push the metal backwards into the shoulder area. But is also cause by brass flow going the otherway. As I said I shoot several 40 degree cases and get about ten firings before ever seeing a sign of the doughnut. To be exact, with a 40 degree shoulder I rarely trim cases because the brass flow is not there like a 25 degree case. By the way there is no such thing as a 260 Ackley. Never has and never will be as he was dead long before the round came about. Ackley also has said that the .308 case was not worth the time to improve more than once, and that's where the 260 case evolved from. gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.257 Wby --> .25-06 AI
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