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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
reamers/chambering
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<blockquote data-quote="VinceMule" data-source="post: 2853842" data-attributes="member: 122164"><p>MagnumMania, this is not an attack on you or your thinking process, so please do not take it that way, as we are just having a discussion.</p><p></p><p>Quote, "</p><p> 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."</p><p></p><p>If I had found that brass was .005 under SAAMI or CIP spec, there would be no problem, but this is not the case with the exception of the Winchester brand of brass and Rem in some cases. Getting measurements off of the case is a system to double-check brass dimensions of that particular lot number vs the Reamer print, Winchester brass is smaller than Lapua, RWS, Norma, AGD in some cases, and Alpha with each cartridge having its particulars.</p><p></p><p>Cartridges I have worked with have been from the 17 Ackley Hornet to the 7 STW, larger cases, I have no experience with. I could go into the cartridges where I have seen problems with brass dimensions vs Reamer dimensions but it would be boring to most.</p><p></p><p>Magnum, you are correct that designing a reamer comes with compromises when it comes to dies, but often changing a dimension by .003-.0035 in the web(if necessary) can eliminate problems, again it gets boring to get into the specific cases. Specific cartridges with three different brands of brass from new brass companies may have their challenges. Dies from different makers are another issue as you are well aware of as production dies can certainly vary for a myriad of reasons.</p></blockquote><p></p>
[QUOTE="VinceMule, post: 2853842, member: 122164"] MagnumMania, this is not an attack on you or your thinking process, so please do not take it that way, as we are just having a discussion. Quote, " 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." If I had found that brass was .005 under SAAMI or CIP spec, there would be no problem, but this is not the case with the exception of the Winchester brand of brass and Rem in some cases. Getting measurements off of the case is a system to double-check brass dimensions of that particular lot number vs the Reamer print, Winchester brass is smaller than Lapua, RWS, Norma, AGD in some cases, and Alpha with each cartridge having its particulars. Cartridges I have worked with have been from the 17 Ackley Hornet to the 7 STW, larger cases, I have no experience with. I could go into the cartridges where I have seen problems with brass dimensions vs Reamer dimensions but it would be boring to most. Magnum, you are correct that designing a reamer comes with compromises when it comes to dies, but often changing a dimension by .003-.0035 in the web(if necessary) can eliminate problems, again it gets boring to get into the specific cases. Specific cartridges with three different brands of brass from new brass companies may have their challenges. Dies from different makers are another issue as you are well aware of as production dies can certainly vary for a myriad of reasons. [/QUOTE]
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