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Rifles, Reloading, Optics, Equipment
Reloading
25-06AI headspace?
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<blockquote data-quote="Alibiiv" data-source="post: 2828756" data-attributes="member: 69192"><p>Based upon what you have written for dimensions on your brass prior to and after fire forming I suggest taking .003 thousandths off of the top of the shell holder. I have read some of the replies here, this is how I have and how I would do it. First I would take a micrometer reading of your shell holder to use as a base line. From there I would use a flat surface such as a piece of glass on a work bench and a sheet of 400 grit, wet sandpaper and some WD 40 or other thin oil (Rem Oil) to use as a lubricating base on the wet sandpaper. I personally use the metal top of my bench saw as a solid base. From there put a generous amount of WD40 on the wet sandpaper, grasp the back of the shell holder between your thumb and trigger finger and make a figure 8 on the sandpaper, use your other hand to keep the sandpaper from moving. The longer the figure 8 the quicker the top of the shell holder will be removed. Shell holders are made of hardened steel so metal removal is a little difficult, but very doable. After a few swipes across the paper, clean the shell holder off and take a micrometer reading. Keep repeating this process until you have removed .003 thousandths off the top of the shell holder. Remove more off the top if you want to increase the shoulder bump more. Try resizing some cases using the modified shell holder to see if you are reaching the desired measurement. Sometime you may have to remove one or two thousandths more off the top of the shell holder due to spring back of the brass. Also different brands of brass may give you different measurements due to spring back. Annealing prior to resizing will help to prevent the issue of spring back. <strong><em><u>Also </u></em></strong> <strong><em><u>you could have something as simple as a messed up, oversized shell holder</u></em></strong> and no real problems at all other than an $8 shell holder. So... you might want to start there????? With today's market <em><u>"supply and demand"</u></em> and <em><u>"quality control"</u></em> are no longer synonymous, nor ought not be used in the same sentence anymore!!!!!</p></blockquote><p></p>
[QUOTE="Alibiiv, post: 2828756, member: 69192"] Based upon what you have written for dimensions on your brass prior to and after fire forming I suggest taking .003 thousandths off of the top of the shell holder. I have read some of the replies here, this is how I have and how I would do it. First I would take a micrometer reading of your shell holder to use as a base line. From there I would use a flat surface such as a piece of glass on a work bench and a sheet of 400 grit, wet sandpaper and some WD 40 or other thin oil (Rem Oil) to use as a lubricating base on the wet sandpaper. I personally use the metal top of my bench saw as a solid base. From there put a generous amount of WD40 on the wet sandpaper, grasp the back of the shell holder between your thumb and trigger finger and make a figure 8 on the sandpaper, use your other hand to keep the sandpaper from moving. The longer the figure 8 the quicker the top of the shell holder will be removed. Shell holders are made of hardened steel so metal removal is a little difficult, but very doable. After a few swipes across the paper, clean the shell holder off and take a micrometer reading. Keep repeating this process until you have removed .003 thousandths off the top of the shell holder. Remove more off the top if you want to increase the shoulder bump more. Try resizing some cases using the modified shell holder to see if you are reaching the desired measurement. Sometime you may have to remove one or two thousandths more off the top of the shell holder due to spring back of the brass. Also different brands of brass may give you different measurements due to spring back. Annealing prior to resizing will help to prevent the issue of spring back. [B][I][U]Also [/U][/I][/B] [B][I][U]you could have something as simple as a messed up, oversized shell holder[/U][/I][/B] and no real problems at all other than an $8 shell holder. So... you might want to start there????? With today's market [I][U]"supply and demand"[/U][/I] and [I][U]"quality control"[/U][/I] are no longer synonymous, nor ought not be used in the same sentence anymore!!!!! [/QUOTE]
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