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Rifles, Reloading, Optics, Equipment
Reloading
Bullet Runout---How to Fix
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<blockquote data-quote="ss7mm" data-source="post: 96418" data-attributes="member: 5"><p>Steve:</p><p></p><p>A search for either "runout" or "concentricity" will get you a ton of reading. </p><p></p><p>One thing you can do is take a case before you do anything to it as far as prep goes and measure everything before and after each individual step and this will probably tell you which step in your case prep process is causing the problem.</p><p></p><p>With the standard type dies there is always the possibility you may not do better but you can try a lot of things. A lot of problems are caused by standard full length resizing dies. Play with the decapping rod and expander ball to see if you can adjust it slightly up or down and get the unit centered better and possibly decrease runout. Depending on your chamber neck dimensions and your case dimensions you might be able to eliminate the expander ball. The expander ball being pulled through the neck is one of the biggest culprits when it comes to neck runout.</p><p></p><p>Make sure all cases are the same length, squared exactly, and that all are deburred and chamfered the same.</p><p></p><p>It sounds like, by your description, you are talking about case neck runout before you even get to the seating process. Also, is you measurement before or after you turned the necks? The first thing I'd do is take about 5 or 6 cases as a test group and run them through each of your steps and measure every thing before and after. Find the step that is causing the problem and deal with that step to make it as good as you can. You may end up going with Redding comp dies, or something similar, if you can't get yours to give you what you want but you should be able to at least determine which step is causing the problem and make it as good as you can with what you have.</p><p></p><p>When you get to the seating process you again need to know that all cases are the same length, squared up exactly, and all deburring and chamfering is consistently the same. If it's bullet runout you're talking about, what was the case neck runout before seating the bullets? You can slightly seat the bullet, turn it a little, seat it some more and even turn it again before finally seating it fully. Sometimes this will give you better seated bullet concentricity. Make sure the seating stem is not interfering with, or hitting, the tip of the bullet. You can play with the seating stem by making slight adjustments to try and center it and get better concentricity when seating.</p><p></p><p>In the end, the law of averages will probably indicate that you may be better off biting the bullet, so to speak, and going with some quality comp dies. But until you get to that point you can eliminate as much as you can with your standard dies.</p><p></p><p>I look at the die thing like I would with most everything else in a precision long range setup from gun to reloading. I doubt that you would try to save a few bucks on building your gun but it seems like a lot of people want to save a few bucks and not go with the best dies available. In the end I think you'll find the money spent on quality, comp dies will be an investment you will be happy with after all is said and done.</p><p></p><p>Roy.....I waited on you this time /ubbthreads/images/graemlins/grin.gif</p></blockquote><p></p>
[QUOTE="ss7mm, post: 96418, member: 5"] Steve: A search for either “runout” or “concentricity” will get you a ton of reading. One thing you can do is take a case before you do anything to it as far as prep goes and measure everything before and after each individual step and this will probably tell you which step in your case prep process is causing the problem. With the standard type dies there is always the possibility you may not do better but you can try a lot of things. A lot of problems are caused by standard full length resizing dies. Play with the decapping rod and expander ball to see if you can adjust it slightly up or down and get the unit centered better and possibly decrease runout. Depending on your chamber neck dimensions and your case dimensions you might be able to eliminate the expander ball. The expander ball being pulled through the neck is one of the biggest culprits when it comes to neck runout. Make sure all cases are the same length, squared exactly, and that all are deburred and chamfered the same. It sounds like, by your description, you are talking about case neck runout before you even get to the seating process. Also, is you measurement before or after you turned the necks? The first thing I’d do is take about 5 or 6 cases as a test group and run them through each of your steps and measure every thing before and after. Find the step that is causing the problem and deal with that step to make it as good as you can. You may end up going with Redding comp dies, or something similar, if you can’t get yours to give you what you want but you should be able to at least determine which step is causing the problem and make it as good as you can with what you have. When you get to the seating process you again need to know that all cases are the same length, squared up exactly, and all deburring and chamfering is consistently the same. If it's bullet runout you're talking about, what was the case neck runout before seating the bullets? You can slightly seat the bullet, turn it a little, seat it some more and even turn it again before finally seating it fully. Sometimes this will give you better seated bullet concentricity. Make sure the seating stem is not interfering with, or hitting, the tip of the bullet. You can play with the seating stem by making slight adjustments to try and center it and get better concentricity when seating. In the end, the law of averages will probably indicate that you may be better off biting the bullet, so to speak, and going with some quality comp dies. But until you get to that point you can eliminate as much as you can with your standard dies. I look at the die thing like I would with most everything else in a precision long range setup from gun to reloading. I doubt that you would try to save a few bucks on building your gun but it seems like a lot of people want to save a few bucks and not go with the best dies available. In the end I think you’ll find the money spent on quality, comp dies will be an investment you will be happy with after all is said and done. Roy.....I waited on you this time [img]/ubbthreads/images/graemlins/grin.gif[/img] [/QUOTE]
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Bullet Runout---How to Fix
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