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Rifles, Reloading, Optics, Equipment
Reloading
Cooper rifle won't chamber twice fired brass
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<blockquote data-quote="25WSM" data-source="post: 1865459" data-attributes="member: 38048"><p>I highly doubt that your chamber is too tight as you have stayed it will chamber factory and once fired brass. Typically neck sized brass starts to get tight at around 3 to 4 shots. I think you have a minimum spec chamber. Still within spec and nothing wrong with it. I used to build all my rifles with a minimum spec chamber till I got tired of cutting the bottom off of factory dies. Some dies just won't push the shoulder back even when bottomed out. If you haven't measured your shoulder setback you don't know if you are sizing you brass enough at the shoulder length. You need to measure a fired round and then compare it to your sized round. If you are not setting the shoulder back .001 to .003 then you are basically neck sizing. If your die isn't sizing far enough and your all the way down then you have 2 options. Have a machine shop take .010 off bottom of your sizing die or take your shell holder and put it upside down on a piece of sand paper and remove some off the top till you get the setback you need. Redding makes compatition shell holders that have differing heights maybe one of those will give you the extra crush you need.</p><p>Most brass will go 5 shots or so before needing trimmed so I doubt that the necks are too long but it's an easy measurement so check it. Cooper's are pretty much a semi custom gun so I wouldn't doubt that you have a perfect minimum chamber on yours.</p><p>Get those measurements and get back to us and we can better help you.</p><p>Shep</p></blockquote><p></p>
[QUOTE="25WSM, post: 1865459, member: 38048"] I highly doubt that your chamber is too tight as you have stayed it will chamber factory and once fired brass. Typically neck sized brass starts to get tight at around 3 to 4 shots. I think you have a minimum spec chamber. Still within spec and nothing wrong with it. I used to build all my rifles with a minimum spec chamber till I got tired of cutting the bottom off of factory dies. Some dies just won't push the shoulder back even when bottomed out. If you haven't measured your shoulder setback you don't know if you are sizing you brass enough at the shoulder length. You need to measure a fired round and then compare it to your sized round. If you are not setting the shoulder back .001 to .003 then you are basically neck sizing. If your die isn't sizing far enough and your all the way down then you have 2 options. Have a machine shop take .010 off bottom of your sizing die or take your shell holder and put it upside down on a piece of sand paper and remove some off the top till you get the setback you need. Redding makes compatition shell holders that have differing heights maybe one of those will give you the extra crush you need. Most brass will go 5 shots or so before needing trimmed so I doubt that the necks are too long but it's an easy measurement so check it. Cooper's are pretty much a semi custom gun so I wouldn't doubt that you have a perfect minimum chamber on yours. Get those measurements and get back to us and we can better help you. Shep [/QUOTE]
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Cooper rifle won't chamber twice fired brass
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