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Rifles, Reloading, Optics, Equipment
Reloading
Is there any Downside to a 40* Shoulder ?
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<blockquote data-quote="Trickymissfit" data-source="post: 523038" data-attributes="member: 25383"><p>I don't remember who the original poster was on this board, but he made a comment about the 40 degree shoulder seeming to produce the dreaded doughnut sooner than the 30 or 35 degree shoulder. I did dissagree with him, and later on did a check with a bunch of empty case. The boy was right! I did some more checking with a bunch of 30 degree cases, and they were better (still a few had it). I honestly have no more plans on doing any 40 degree shoulders if I can get out of it.</p><p> </p><p>Now the 22-250 basic case is well known for it's brass flow, as well as splitting necks (I associate the two together). Have never bothered to build a 22-250AI, as I watched several of my friends do them over the years, and I got a first hand glimpse into what else happens. Case shrinkage during fire forming is quite a bit (around .04" - .045"), and I think much of the neck splitting is due to all the wall and neck movement during fire forming. I shoot the 6/250AI (very similar, but necked up to 6mm), and you can forget the grand scheme ofusing factory 22-250 brass. Better off using .243 Winchester brass from the start. Most of my friends that still shoot the 22-250AI case now use generic .243 Win. brass. They seem to get better cases after fire forming.</p><p> </p><p>The 40 degree shoulder is a pain to form, unless your fire forming. A 35 degree shoulder is a little easier, but the 30 degree shoulder is fairly easy. There is a 22-250 improved round that uses a 30 degree shoulder, and another that's made off of the .243 case with a 40 degree shoulder. The latter has a .30" neck length, and is known to push a 63 grain bullet in the 3900fps area. </p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 523038, member: 25383"] I don't remember who the original poster was on this board, but he made a comment about the 40 degree shoulder seeming to produce the dreaded doughnut sooner than the 30 or 35 degree shoulder. I did dissagree with him, and later on did a check with a bunch of empty case. The boy was right! I did some more checking with a bunch of 30 degree cases, and they were better (still a few had it). I honestly have no more plans on doing any 40 degree shoulders if I can get out of it. Now the 22-250 basic case is well known for it's brass flow, as well as splitting necks (I associate the two together). Have never bothered to build a 22-250AI, as I watched several of my friends do them over the years, and I got a first hand glimpse into what else happens. Case shrinkage during fire forming is quite a bit (around .04" - .045"), and I think much of the neck splitting is due to all the wall and neck movement during fire forming. I shoot the 6/250AI (very similar, but necked up to 6mm), and you can forget the grand scheme ofusing factory 22-250 brass. Better off using .243 Winchester brass from the start. Most of my friends that still shoot the 22-250AI case now use generic .243 Win. brass. They seem to get better cases after fire forming. The 40 degree shoulder is a pain to form, unless your fire forming. A 35 degree shoulder is a little easier, but the 30 degree shoulder is fairly easy. There is a 22-250 improved round that uses a 30 degree shoulder, and another that's made off of the .243 case with a 40 degree shoulder. The latter has a .30" neck length, and is known to push a 63 grain bullet in the 3900fps area. gary [/QUOTE]
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Is there any Downside to a 40* Shoulder ?
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