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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Cooper - Headspace?
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<blockquote data-quote="J E Custom" data-source="post: 867413" data-attributes="member: 2736"><p>After reading all the responses, I will add my thoughts of what I would do if it were mine.</p><p></p><p>First I would buy a head space gage ($35.00) and check it.</p><p></p><p>And if this proved to be correct I would do a chamber cast to dimension the chamber, Reamers do wear and can lose there original dimensions by a few thousandths (A head space gage will not </p><p>show this).</p><p></p><p>If everything proves out, Then I would full length size all of my new brass before I load it checking it as I go in the chamber.</p><p></p><p>In coopers defense: In an effort to produce an accurate rifle they may use a (Match Reamer) that is</p><p>the minimum SAMME size leaving little or no room for error. and if the reamer has cut many chambers the diameter loss from a worn reamer could also be the problem.</p><p></p><p>If you try a box of factory ammo and it does not chamber easily it is probably a issue with the chamber and touching it with a SAMME reamer should clear it up. But you would not want to increase the head space with the new reamer just enlarge the barrel of the chamber.</p><p></p><p>Of course this is all speculation not having the rifle in my hands to check it.</p><p></p><p>So my recommendation would be to verifier that there is not a chamber problem and then work</p><p>on the sizing/loading process.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 867413, member: 2736"] After reading all the responses, I will add my thoughts of what I would do if it were mine. First I would buy a head space gage ($35.00) and check it. And if this proved to be correct I would do a chamber cast to dimension the chamber, Reamers do wear and can lose there original dimensions by a few thousandths (A head space gage will not show this). If everything proves out, Then I would full length size all of my new brass before I load it checking it as I go in the chamber. In coopers defense: In an effort to produce an accurate rifle they may use a (Match Reamer) that is the minimum SAMME size leaving little or no room for error. and if the reamer has cut many chambers the diameter loss from a worn reamer could also be the problem. If you try a box of factory ammo and it does not chamber easily it is probably a issue with the chamber and touching it with a SAMME reamer should clear it up. But you would not want to increase the head space with the new reamer just enlarge the barrel of the chamber. Of course this is all speculation not having the rifle in my hands to check it. So my recommendation would be to verifier that there is not a chamber problem and then work on the sizing/loading process. J E CUSTOM [/QUOTE]
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Cooper - Headspace?
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