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Rifles, Reloading, Optics, Equipment
Reloading
Signs of pressure?
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<blockquote data-quote="Blackhawk" data-source="post: 1846926" data-attributes="member: 105459"><p>What I see on the case head appears to to be marks from the claw type extractor . IMHO they do not appear to be an indicator of the cartridge base making contact with the bolt face. There would be a flattening of the cartridge case head as it makes contact with the bolt. You will notice perhaps some radial striations as well as a ring from the primer punch protruding from the bolt itself onto your cases head.. You will also notice a slight flattening of the manufactures name and caliber on the case head. In extreme cases you will notice that grey powder residue as well as the primer being pushed out from flush along with marks from the bolts face making contact with the cartridge head itself.. Last you may or may not experience extraction issiues with your case while removing it from your rifle .A simple test is to mike your fired case at the base against a virgin case. Normally you will see about a .003" - .004" difference between the the two. (based on a 6.5 - 30 caliber round & .004" - .005" difference between magnum rounds) If you notice any more then I would decrease your load's powder by at least 5% and reestablish your load data.</p><p>As for the cratering of your primers I do not think that this alone indicates anything. Please let me qualify that statement!. Your primers do not show any signs of flattening.(notice your rounded primer edges). It can be several direct causes.</p><p>One it will depend on your rifles build and brand as well as well as the type of primer that you are using.(assuming that you hand load) Secondly it will depend on your rifles condition. Last it will depend on your choice of ammunition components.</p><p>I would change things up as far as primers go and assuming all else is OK then I would continue using your loads recipe, as it looks worthy to me and what I am seeing in your images. That small amount of primer cratering well it's just normal with some brands of firearms. I would not concern myself with it ,however just occasionally keep an eye on it.</p><p><em><strong> Just remember your chronograph is your best friend. Watch your ES & SD numbers until they tighten up and you will have reached your optimum load !</strong></em></p></blockquote><p></p>
[QUOTE="Blackhawk, post: 1846926, member: 105459"] What I see on the case head appears to to be marks from the claw type extractor . IMHO they do not appear to be an indicator of the cartridge base making contact with the bolt face. There would be a flattening of the cartridge case head as it makes contact with the bolt. You will notice perhaps some radial striations as well as a ring from the primer punch protruding from the bolt itself onto your cases head.. You will also notice a slight flattening of the manufactures name and caliber on the case head. In extreme cases you will notice that grey powder residue as well as the primer being pushed out from flush along with marks from the bolts face making contact with the cartridge head itself.. Last you may or may not experience extraction issiues with your case while removing it from your rifle .A simple test is to mike your fired case at the base against a virgin case. Normally you will see about a .003" - .004" difference between the the two. (based on a 6.5 - 30 caliber round & .004" - .005" difference between magnum rounds) If you notice any more then I would decrease your load's powder by at least 5% and reestablish your load data. As for the cratering of your primers I do not think that this alone indicates anything. Please let me qualify that statement!. Your primers do not show any signs of flattening.(notice your rounded primer edges). It can be several direct causes. One it will depend on your rifles build and brand as well as well as the type of primer that you are using.(assuming that you hand load) Secondly it will depend on your rifles condition. Last it will depend on your choice of ammunition components. I would change things up as far as primers go and assuming all else is OK then I would continue using your loads recipe, as it looks worthy to me and what I am seeing in your images. That small amount of primer cratering well it's just normal with some brands of firearms. I would not concern myself with it ,however just occasionally keep an eye on it. [I][B] Just remember your chronograph is your best friend. Watch your ES & SD numbers until they tighten up and you will have reached your optimum load ![/B][/I] [/QUOTE]
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Signs of pressure?
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