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Rifles, Reloading, Optics, Equipment
Reloading
Cooper rifle won't chamber twice fired brass
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<blockquote data-quote="David Urasky" data-source="post: 1866169" data-attributes="member: 108550"><p>Here's a new look at the problem. I was working up dasher loads and was really pushing them as I'm shooting a bolt action pistol. As I got to max load for that chamber I found the same problem you are having. Except it was just one hot load. No heavy bolt lift, slight primer crater no excessive primer flattening. My problem was the brass expanding in the head below where the die reached. I'm using both Whidden and Wilson dies so they are not the problem. </p><p></p><p>I normally shoot Lapua brass and have never had this problem. If I use fire formed Lapua brass at the same loads the is no problem. The problem only exists while using Norma brass. Although I no longer have a Rockwell hardness tester at my disposal I'll bet that the Norma brass has a softer or thinner head than the Lapua. To test the fit I chambered a piece of shot out barrel so the headspace gauge sits flush with the bottom the the barrel and drop the sized brass into it. If it drops in completely I'm good. If it doesn't I know that load is too hot for that brass.</p><p></p><p>Just my experience. Reduce your loads and try it again.</p></blockquote><p></p>
[QUOTE="David Urasky, post: 1866169, member: 108550"] Here’s a new look at the problem. I was working up dasher loads and was really pushing them as I’m shooting a bolt action pistol. As I got to max load for that chamber I found the same problem you are having. Except it was just one hot load. No heavy bolt lift, slight primer crater no excessive primer flattening. My problem was the brass expanding in the head below where the die reached. I’m using both Whidden and Wilson dies so they are not the problem. I normally shoot Lapua brass and have never had this problem. If I use fire formed Lapua brass at the same loads the is no problem. The problem only exists while using Norma brass. Although I no longer have a Rockwell hardness tester at my disposal I’ll bet that the Norma brass has a softer or thinner head than the Lapua. To test the fit I chambered a piece of shot out barrel so the headspace gauge sits flush with the bottom the the barrel and drop the sized brass into it. If it drops in completely I’m good. If it doesn’t I know that load is too hot for that brass. Just my experience. Reduce your loads and try it again. [/QUOTE]
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Reloading
Cooper rifle won't chamber twice fired brass
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