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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.257 wildcat build
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<blockquote data-quote="elkaholic" data-source="post: 1161368" data-attributes="member: 13833"><p>In the case of the SS, the shoulder is moved back, not for the purpose of changing it to 40 degrees but rather to make a shorter case. The shoulder is then sharpened to 40 degrees by BLOWING THE CASE FORWARD at the new neck/shoulder junction by fire forming in a chamber with a 40 degree shoulder. YOU HAVE TO HAVE A POINT TO HEADSPACE ON! At the same time, the taper is blown out of the case by having the chamber diameter larger and BLOWING it out. You never PUSH a 40 degree shoulder into place by using a die to re form a 30 degree or whatever! This will destroy the case every time, especially when you are removing taper from the case as well. There is nothing to support the brass in the die and it will bulge at the body/shoulder junction or simply wrinkle the shoulder.</p><p>To be PC when I said in an above quote that (40 shoulder increases case capacity) "EDD" was correct; however, in the real world of wildcatting, the 40 shoulder is ALWAYS created by blowing it forward from an old neck/shoulder junction (ex: Ackley Imp.) or by creating a false shoulder on the neck to headspace on and blowing the shoulder forward (Ex: 6.5 Sherman) Long Action version.</p><p>Just so it is covered in advance, someone will probably say that "you can seat a bullet into the lands to provide something to headspace on" which is true, but not the best way to do it. I hope this makes sense......Rich</p></blockquote><p></p>
[QUOTE="elkaholic, post: 1161368, member: 13833"] In the case of the SS, the shoulder is moved back, not for the purpose of changing it to 40 degrees but rather to make a shorter case. The shoulder is then sharpened to 40 degrees by BLOWING THE CASE FORWARD at the new neck/shoulder junction by fire forming in a chamber with a 40 degree shoulder. YOU HAVE TO HAVE A POINT TO HEADSPACE ON! At the same time, the taper is blown out of the case by having the chamber diameter larger and BLOWING it out. You never PUSH a 40 degree shoulder into place by using a die to re form a 30 degree or whatever! This will destroy the case every time, especially when you are removing taper from the case as well. There is nothing to support the brass in the die and it will bulge at the body/shoulder junction or simply wrinkle the shoulder. To be PC when I said in an above quote that (40 shoulder increases case capacity) "EDD" was correct; however, in the real world of wildcatting, the 40 shoulder is ALWAYS created by blowing it forward from an old neck/shoulder junction (ex: Ackley Imp.) or by creating a false shoulder on the neck to headspace on and blowing the shoulder forward (Ex: 6.5 Sherman) Long Action version. Just so it is covered in advance, someone will probably say that "you can seat a bullet into the lands to provide something to headspace on" which is true, but not the best way to do it. I hope this makes sense......Rich [/QUOTE]
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.257 wildcat build
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