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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
reamers/chambering
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<blockquote data-quote="MagnumManiac" data-source="post: 2853762" data-attributes="member: 10755"><p>When I first saw this thread I tossed around my very first thought and told myself to see what answers came first…</p><p></p><p>I have done this, designing/ordering reamers, that I just don't understand the thinking behind basing a chamber off a piece of brass.</p><p></p><p>Firstly, basing a reamer print off of a piece of brass is foolhardy…the reason being most brass is .005" smaller in every dimension than SAAMI or CIP specs. Unless you know this and compensate, you are going to have issues with tight chambers, brass not sizing correctly, dies splitting and other issues. (I do not use neck turn chambers anymore!)</p><p>Secondly, having the dies made is very expensive, buying the die reamers is a problem, how many barrels are you planning on turning up and selling are you planning on doing? If this is for yourself, just get Whidden to make your dies, this is what I have done for my own wildcats, including hydro forming dies.</p><p></p><p>Thirdly, designing a chamber is thwart with compromise, get it wrong in one place, and it affects the overall result, just like tolerance stacking does. I have lived this more than once, the original dimensions for most Weatherby rounds prior to the 378 Bee were .500" long, .0005"clearance parallel sided throats, so that's what I stipulated using CIP dimensions for my reamers in 300, 340 & 375… US made die's do not like these dimensions, every case was not being sized on the shoulder, but the bodies were forcing the shoulders to elongate, the only solution was to turn down shell holders to allow the cases in further, it worked, but the area above the belt was sized too much…a compromise I didn't foresee.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2853762, member: 10755"] When I first saw this thread I tossed around my very first thought and told myself to see what answers came first… I have done this, designing/ordering reamers, that I just don’t understand the thinking behind basing a chamber off a piece of brass. Firstly, basing a reamer print off of a piece of brass is foolhardy…the reason being most brass is .005” smaller in every dimension than SAAMI or CIP specs. Unless you know this and compensate, you are going to have issues with tight chambers, brass not sizing correctly, dies splitting and other issues. (I do not use neck turn chambers anymore!) Secondly, having the dies made is very expensive, buying the die reamers is a problem, how many barrels are you planning on turning up and selling are you planning on doing? If this is for yourself, just get Whidden to make your dies, this is what I have done for my own wildcats, including hydro forming dies. Thirdly, designing a chamber is thwart with compromise, get it wrong in one place, and it affects the overall result, just like tolerance stacking does. I have lived this more than once, the original dimensions for most Weatherby rounds prior to the 378 Bee were .500” long, .0005”clearance parallel sided throats, so that’s what I stipulated using CIP dimensions for my reamers in 300, 340 & 375… US made die’s do not like these dimensions, every case was not being sized on the shoulder, but the bodies were forcing the shoulders to elongate, the only solution was to turn down shell holders to allow the cases in further, it worked, but the area above the belt was sized too much…a compromise I didn’t foresee. Cheers. [/QUOTE]
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