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Rifles, Reloading, Optics, Equipment
Reloading
Belted Magnums--Headspace on Shoulder or Belt?
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<blockquote data-quote="Rustystud" data-source="post: 410000" data-attributes="member: 9964"><p><strong>Some Ideas on what you are saying...</strong></p><p></p><p>The last time I looked at a chamber reamer it was fixed in dimensions just as a cut chamber is fixed in dimensions.</p><p> </p><p>SAAMI measures belted magnums from the belt on Belted cases, from the datum line on the shoulder to the back of the case head on rimless cases, and rimmed cases are heaspaced off the depth of the rim.</p><p> </p><p>If one measures off the shoulder to the case head on a belted case one would be using compounding numbers.</p><p> </p><p>The measurement from the datum line on a belted case to the front of the belt is one measurment (not Headspace) and the measurment from the front of the belt to the back of the case head is the headspace measurment.</p><p> </p><p>The distance from the datum line on a belted case is just one of the dimensions.</p><p> </p><p>Dies for full length sizing of belted cases are made three ways.</p><p> </p><p>1. One type sizes past the belt by being undercut at the mouth to pass over the belt.</p><p> </p><p>2. The second type sizes to the front of the belt.</p><p> </p><p>3. The third type are made to size short of the belt.</p><p> </p><p>Number one and number two the dies is cut .0015-.002" short to accomodate for full length sizing. Number three relies on the person loading to adjust for the correct amount of sizing. Type three does not full length size the web of the case. This die requires a body die to full length size. There is a fourth type of die made for sizing belted cases and it uses a collet that is adjustable and/or has fingers that compress at the bottom of the case sizing the web area. It come in two forms an adjustable floating collet or a fixed collet and the die is adjustable with locking rings.</p><p> </p><p>Again we are talking about terminology and measurements. There is a difference between case length and headspacing.</p><p> </p><p>Headspacing is always headspacing and should not be confused with case sizing issues. I can't make it any clearer. I would suggest you read Wayne Van Zol's addition to Frank de Haus's book "THE BOLT ACTION RIFLE" 3rd edition. He gives as good of explaination of this as I know of being written anywhere.</p><p> </p><p>I have been reloading ammunition for 45+ years and building rifles for about 40 + years. I would estimate that I have loaded 50,000 300 Win mags for myself and my customers over the years.</p><p> </p><p>Nat Lambeth</p><p>Custom Guns and Amminition</p></blockquote><p></p>
[QUOTE="Rustystud, post: 410000, member: 9964"] [b]Some Ideas on what you are saying...[/b] The last time I looked at a chamber reamer it was fixed in dimensions just as a cut chamber is fixed in dimensions. SAAMI measures belted magnums from the belt on Belted cases, from the datum line on the shoulder to the back of the case head on rimless cases, and rimmed cases are heaspaced off the depth of the rim. If one measures off the shoulder to the case head on a belted case one would be using compounding numbers. The measurement from the datum line on a belted case to the front of the belt is one measurment (not Headspace) and the measurment from the front of the belt to the back of the case head is the headspace measurment. The distance from the datum line on a belted case is just one of the dimensions. Dies for full length sizing of belted cases are made three ways. 1. One type sizes past the belt by being undercut at the mouth to pass over the belt. 2. The second type sizes to the front of the belt. 3. The third type are made to size short of the belt. Number one and number two the dies is cut .0015-.002" short to accomodate for full length sizing. Number three relies on the person loading to adjust for the correct amount of sizing. Type three does not full length size the web of the case. This die requires a body die to full length size. There is a fourth type of die made for sizing belted cases and it uses a collet that is adjustable and/or has fingers that compress at the bottom of the case sizing the web area. It come in two forms an adjustable floating collet or a fixed collet and the die is adjustable with locking rings. Again we are talking about terminology and measurements. There is a difference between case length and headspacing. Headspacing is always headspacing and should not be confused with case sizing issues. I can't make it any clearer. I would suggest you read Wayne Van Zol's addition to Frank de Haus's book "THE BOLT ACTION RIFLE" 3rd edition. He gives as good of explaination of this as I know of being written anywhere. I have been reloading ammunition for 45+ years and building rifles for about 40 + years. I would estimate that I have loaded 50,000 300 Win mags for myself and my customers over the years. Nat Lambeth Custom Guns and Amminition [/QUOTE]
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Belted Magnums--Headspace on Shoulder or Belt?
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