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Rifles, Reloading, Optics, Equipment
Reloading
Chambered Round Alignment to Bore; Neck Sized vs Full Length Sized
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<blockquote data-quote="Trickymissfit" data-source="post: 645803" data-attributes="member: 25383"><p>I did some checking on just how well a fired case fit the chamber in three different rifles of mine years back. I swabbed the inside of the chamber with high spot blue, and coated the brass with red lead. Then carefully put the cases back in the the chamber and closed the bolt (Remington, two Savages, and a Winchester). Al chambers were either custom cut or national match no turn chambers. What really surprised me was that there really was little contact on the case body O.D.! But on the otherhand there was plenty of contact at the shoulders (probably 75%). The greater the shoulder angle the greater the contact area marked. Thinking I might have had too much red lead on the brass, I completely cleaned them, and wiped them with a Scotch Brite pad for a dull finish. I did the same exact test, and got the same readings.</p><p> </p><p>I learned that I was getting good headspace with my neck sized cases. Later I did the same exact test with full length resized cases that did not move the shoulder much if any at all. I saw the same thing in the shoulders, but even less contact with the O.D. So to take this a step further, I made up several bushings that would contact the case O.D. at the shoulder, midway down, and about a quarter inch above the base of the case. Then I made a long bushing to use with a pair of calipers that would clear the entire case but still contact the bushing. That's how I determined (at that time) that I was actually shrinking the case body too much on the O.D. even if I never touched the shoulders. In otherwords the die was oversizing the case for the chamber size. Or the chambers were over sized for each die. I was going to try and polish out the die to make it size bigger, but never got around to getting it done. Looking back, I'd say that with a tight necked chamber (three of the rifles were) and neck sized cases, the neck itself aided in aligning the cases to the chamber centerline as much as anything I did. But what was really needed was a better die setup from the start.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 645803, member: 25383"] I did some checking on just how well a fired case fit the chamber in three different rifles of mine years back. I swabbed the inside of the chamber with high spot blue, and coated the brass with red lead. Then carefully put the cases back in the the chamber and closed the bolt (Remington, two Savages, and a Winchester). Al chambers were either custom cut or national match no turn chambers. What really surprised me was that there really was little contact on the case body O.D.! But on the otherhand there was plenty of contact at the shoulders (probably 75%). The greater the shoulder angle the greater the contact area marked. Thinking I might have had too much red lead on the brass, I completely cleaned them, and wiped them with a Scotch Brite pad for a dull finish. I did the same exact test, and got the same readings. I learned that I was getting good headspace with my neck sized cases. Later I did the same exact test with full length resized cases that did not move the shoulder much if any at all. I saw the same thing in the shoulders, but even less contact with the O.D. So to take this a step further, I made up several bushings that would contact the case O.D. at the shoulder, midway down, and about a quarter inch above the base of the case. Then I made a long bushing to use with a pair of calipers that would clear the entire case but still contact the bushing. That's how I determined (at that time) that I was actually shrinking the case body too much on the O.D. even if I never touched the shoulders. In otherwords the die was oversizing the case for the chamber size. Or the chambers were over sized for each die. I was going to try and polish out the die to make it size bigger, but never got around to getting it done. Looking back, I'd say that with a tight necked chamber (three of the rifles were) and neck sized cases, the neck itself aided in aligning the cases to the chamber centerline as much as anything I did. But what was really needed was a better die setup from the start. gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Chambered Round Alignment to Bore; Neck Sized vs Full Length Sized
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