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Rifles, Reloading, Optics, Equipment
Reloading
Cooper rifle won't chamber twice fired brass
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<blockquote data-quote="BountyHunter" data-source="post: 1865878" data-attributes="member: 12"><p>Lesson learned here is this: </p><p></p><p>Great exercise in finding out what is wrong though. The blackening a case marking on the brass will tell you normally if the issue is the base and most of the time that is where it is at. Lot of comments about suggesting things for headspace when the issue was at the base. IF you have an issue at the base, comp shellholders, grinding some off the bottom of the die, camover and camover presses ONLY address bumping the shoulders. NONE of those fixes will address the base issues. You must identify the area of the issue and do not assume it is headspace.</p><p></p><p>If you go thru a sequential process of isolating the issues you can find it. If you think the case might be too long, sacrifice one by taking off .010-020 and see if it chambers. Sinclair sells little guages to fit in the end of a shortened case to allow you to determine exactly where the max neck length is if you want to go that route when starting your load development process anyway.</p><p></p><p>If you simply cannot push the shoulders back far enough for a true headspace issue, then grinding .015-020 off the bottom of the die works. Same thing using the competition shellholders that allow .010 adjustment in .020 increments.</p><p></p><p>Be careful of bumping the shoulders back too far especially IF you shortened a die, it can and will push the shoulders out wider where the headspace looks good BUT it will not chamber. Back the die off 1/4 turn and slowly work back down resizing that wider spot back in. You can normally measure the case body just below the shoulder and the exact shoulder and see the difference. It is hard to do with your eye. </p><p></p><p>Factory rifle chambers can be all over the map and be within SAAMI dimensions. Same thing for dies. They both have that .010 variance to work within. There in lies the issue most of the time. Just a mismatch between different mftrs specs. Try other die mftrs dies to see if that fixes the issue. If you can borrow one to try that is easier. If not a small base die will fix the issue at the base.</p><p></p><p>I always like to buy my own reamers and use them. I always bought from PTG because I knew PTG made and sold the resize die reamers to redding. I knew I could go towards the minimal side on my reamer but with the specs for the resize reamer given to Redding. Now other reamer guys make great reamers and supply them to other mftrs, I just do not know which ones to who.</p></blockquote><p></p>
[QUOTE="BountyHunter, post: 1865878, member: 12"] Lesson learned here is this: Great exercise in finding out what is wrong though. The blackening a case marking on the brass will tell you normally if the issue is the base and most of the time that is where it is at. Lot of comments about suggesting things for headspace when the issue was at the base. IF you have an issue at the base, comp shellholders, grinding some off the bottom of the die, camover and camover presses ONLY address bumping the shoulders. NONE of those fixes will address the base issues. You must identify the area of the issue and do not assume it is headspace. If you go thru a sequential process of isolating the issues you can find it. If you think the case might be too long, sacrifice one by taking off .010-020 and see if it chambers. Sinclair sells little guages to fit in the end of a shortened case to allow you to determine exactly where the max neck length is if you want to go that route when starting your load development process anyway. If you simply cannot push the shoulders back far enough for a true headspace issue, then grinding .015-020 off the bottom of the die works. Same thing using the competition shellholders that allow .010 adjustment in .020 increments. Be careful of bumping the shoulders back too far especially IF you shortened a die, it can and will push the shoulders out wider where the headspace looks good BUT it will not chamber. Back the die off 1/4 turn and slowly work back down resizing that wider spot back in. You can normally measure the case body just below the shoulder and the exact shoulder and see the difference. It is hard to do with your eye. Factory rifle chambers can be all over the map and be within SAAMI dimensions. Same thing for dies. They both have that .010 variance to work within. There in lies the issue most of the time. Just a mismatch between different mftrs specs. Try other die mftrs dies to see if that fixes the issue. If you can borrow one to try that is easier. If not a small base die will fix the issue at the base. I always like to buy my own reamers and use them. I always bought from PTG because I knew PTG made and sold the resize die reamers to redding. I knew I could go towards the minimal side on my reamer but with the specs for the resize reamer given to Redding. Now other reamer guys make great reamers and supply them to other mftrs, I just do not know which ones to who. [/QUOTE]
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Cooper rifle won't chamber twice fired brass
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