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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
cold weather preasures
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<blockquote data-quote="harfman99" data-source="post: 257365" data-attributes="member: 10938"><p>Hello everyone.</p><p></p><p>I was out doing some load workup with my 7 ultra today and had some problems with over preasuring cases. The temp out today was a balmy -5 deg F. The loads was 91-93 grns of T870 in half grn increments,fed 215's, berger and jlk 180's. The avening did not yield very good results. I started out with the bergers and doing five rounds of microlon with the sighters. The first round sounded and felt really good untill i ejected the spent case. I did not expect to see what i did. There was a nice shiny extrusion where the brass flowed into the extractor. Being that the bolt didn't lift heavy I fired another four and still showing preasures. the rifle being sighted in i moved back to 200yrds to see if either bullet was going to work at these preasures. I shot the jlks first @ 91grns and also still showing preasures. Next were the bergers with the same charge. By this time I was getting cold and put five down fairly quickly and noticed as the barrel warmed the preasure signs went away. The barrel is a Shilen select match in a 7H taper @31". </p><p></p><p>The Question is has anyone had this same problem. From the data that i have found 91 grns should have been a good starting point. </p><p></p><p>Any info would be greatly appreciated.</p><p></p><p>Thanks </p><p>Chris</p></blockquote><p></p>
[QUOTE="harfman99, post: 257365, member: 10938"] Hello everyone. I was out doing some load workup with my 7 ultra today and had some problems with over preasuring cases. The temp out today was a balmy -5 deg F. The loads was 91-93 grns of T870 in half grn increments,fed 215's, berger and jlk 180's. The avening did not yield very good results. I started out with the bergers and doing five rounds of microlon with the sighters. The first round sounded and felt really good untill i ejected the spent case. I did not expect to see what i did. There was a nice shiny extrusion where the brass flowed into the extractor. Being that the bolt didn't lift heavy I fired another four and still showing preasures. the rifle being sighted in i moved back to 200yrds to see if either bullet was going to work at these preasures. I shot the jlks first @ 91grns and also still showing preasures. Next were the bergers with the same charge. By this time I was getting cold and put five down fairly quickly and noticed as the barrel warmed the preasure signs went away. The barrel is a Shilen select match in a 7H taper @31". The Question is has anyone had this same problem. From the data that i have found 91 grns should have been a good starting point. Any info would be greatly appreciated. Thanks Chris [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
cold weather preasures
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