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Rifles, Reloading, Optics, Equipment
Reloading
Trouble bumping shoulder - bad reamer?
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<blockquote data-quote="boomtube" data-source="post: 420066" data-attributes="member: 9215"><p>If factory ammo routinely chambers it's highly unlikely your chamber is a problem. Nor, point of fact, is it likely there's anything wrong with your FL sizer or shell holder. Your goal of achieving a specific point for the shoulder location is moot, headspace is a range, not a specific point. What you see in books is the maximum case shoulder location and that ignores the full chamber tolerance range. Part of what handloading is all about is making our ammo fit our chamber, not the other way around. Die touching a shell holder or not isn't the issue, how far back we set the shoulder is. Redding's "competition" shell holders are no solution because they are thicker, not thinner. All they can do is reduce the amount your cases can enter the die and that will make your present difficulties worse.</p><p> </p><p>You likely aren't sizing them quite enough, I'd bet that if you turn your sizer down another 1/16 turn (about 4.5 thou) and do your sizing again the "problem" you are experiencing will dissappear. There is no reason to set a fired case shoulder back at all from its fired location. It has expanded to fit the chamber and shrunk back at least 1 or 2 thou from that length, all we need do is restore the fired position when FL sizing. </p><p> </p><p>Many reloaders follow basic size die "instructions" by touching a shell holder plus some small additonal turn without a case fully inserted into the die. That only provides a starting point, it can't possibly accomidate the small variations in die and holder tolerances <u>or the significant variations in press spring</u>. A handloader has to tune his sizer by trial and error to accomplish what needs to be done, otherwise he's just doing his loading steps by rote as the factories do. I'm not looking up the headspace tolerance for a 7 mag but for all bottle neck cases it's typically a spread of about 7-9 thou at the shoulder (forget any belt or rim, always resize to the shoulder of a bottle neck case). </p><p> </p><p><strong>IF</strong> you really need to shorten the mouth end of your sizer, do it by sanding or grinding (you can't file that case hardened metal) and a fine grit paper on a belt or disc sander is great for this work. First remove the decapping stem and measure the die body length accurately. Then grind/sand off a couple of thou at a time until you've removed just enough to set the shoulders back as necessary. Do no more or you WILL need the thicker shell holders!</p></blockquote><p></p>
[QUOTE="boomtube, post: 420066, member: 9215"] If factory ammo routinely chambers it's highly unlikely your chamber is a problem. Nor, point of fact, is it likely there's anything wrong with your FL sizer or shell holder. Your goal of achieving a specific point for the shoulder location is moot, headspace is a range, not a specific point. What you see in books is the maximum case shoulder location and that ignores the full chamber tolerance range. Part of what handloading is all about is making our ammo fit our chamber, not the other way around. Die touching a shell holder or not isn't the issue, how far back we set the shoulder is. Redding's "competition" shell holders are no solution because they are thicker, not thinner. All they can do is reduce the amount your cases can enter the die and that will make your present difficulties worse. You likely aren't sizing them quite enough, I'd bet that if you turn your sizer down another 1/16 turn (about 4.5 thou) and do your sizing again the "problem" you are experiencing will dissappear. There is no reason to set a fired case shoulder back at all from its fired location. It has expanded to fit the chamber and shrunk back at least 1 or 2 thou from that length, all we need do is restore the fired position when FL sizing. Many reloaders follow basic size die "instructions" by touching a shell holder plus some small additonal turn without a case fully inserted into the die. That only provides a starting point, it can't possibly accomidate the small variations in die and holder tolerances [U]or the significant variations in press spring[/U]. A handloader has to tune his sizer by trial and error to accomplish what needs to be done, otherwise he's just doing his loading steps by rote as the factories do. I'm not looking up the headspace tolerance for a 7 mag but for all bottle neck cases it's typically a spread of about 7-9 thou at the shoulder (forget any belt or rim, always resize to the shoulder of a bottle neck case). [B]IF[/B] you really need to shorten the mouth end of your sizer, do it by sanding or grinding (you can't file that case hardened metal) and a fine grit paper on a belt or disc sander is great for this work. First remove the decapping stem and measure the die body length accurately. Then grind/sand off a couple of thou at a time until you've removed just enough to set the shoulders back as necessary. Do no more or you WILL need the thicker shell holders! [/QUOTE]
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Trouble bumping shoulder - bad reamer?
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