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Rifles, Reloading, Optics, Equipment
Reloading
Stoneypoint Headspace gauge
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<blockquote data-quote="Bart B" data-source="post: 106687" data-attributes="member: 5302"><p>[ QUOTE ]</p><p>Bart -- I think you forgot a zero...</p><p>5-10 thou shoulder bump /ubbthreads/images/graemlins/shocked.gif</p><p>more like 1-2 thou</p><p>i had Lapua 308 cases separate at the web on the 7th firing and i was moving the shoulder 5thou each sizing.</p><p></p><p>[/ QUOTE ]I was almost right. Thanks for bringing this to my attention.</p><p></p><p>I've found that belted fired case shoulders need to be set back 5/1000ths to 7/1000ths (not 10/1000ths) of an inch or to about where new cases are relative to chamber headspace. This ensures belted cases headspace and stop moving forward from firing pin contact at the belt, not the bottleneck shoulder. Every time I've tested H&amp;H belted cases for accuracy with the shoulder making contact before the belt does, accuracy ain't so good. New cases shoot more accurate than fired cases full-length then double sized setting their shoulder back only "1-2 thou" in my magnums as you suggested. </p><p></p><p>Rimless bottleneck cases are different. They gotta headspace on the shoulder. Their shoulders should be set back 2/1000ths to 3/1000ths (.002 to .003) of an inch from their fired position. Doing this with a .308 Win. case made by Winchester and with a full-length sizing die reducing body diameters about .003-inch has got me at least 60 loads per case cause that's the most I ever reloaded one. Others doing this get 80 to 100 reloads per case. (Anybody ever get that many reloads on any other make case?)</p><p></p><p>Setting fired rimless bottleneck case shoulders back more than about .003-inch will indeed shorten case life. I'm convinced this is why so many folks like to neck-only size or partial-neck size their rimless cases. They set the shoulder back way too far and don't have/use a case headspace gage to measure exactly what they're doing. They over do it full-length sizing and start neck-only sizing and claim better accuracy by doing so. They're right. But if they just got a case headspace gage (RCBS Precision Mic, Stoney Point, there's some that's been available someplace since the 1960's) and used it properly to set up their full-length sizing die, wonderous things would happen.</p></blockquote><p></p>
[QUOTE="Bart B, post: 106687, member: 5302"] [ QUOTE ] Bart -- I think you forgot a zero... 5-10 thou shoulder bump [img]/ubbthreads/images/graemlins/shocked.gif[/img] more like 1-2 thou i had Lapua 308 cases separate at the web on the 7th firing and i was moving the shoulder 5thou each sizing. [/ QUOTE ]I was almost right. Thanks for bringing this to my attention. I've found that belted fired case shoulders need to be set back 5/1000ths to 7/1000ths (not 10/1000ths) of an inch or to about where new cases are relative to chamber headspace. This ensures belted cases headspace and stop moving forward from firing pin contact at the belt, not the bottleneck shoulder. Every time I've tested H&H belted cases for accuracy with the shoulder making contact before the belt does, accuracy ain't so good. New cases shoot more accurate than fired cases full-length then double sized setting their shoulder back only "1-2 thou" in my magnums as you suggested. Rimless bottleneck cases are different. They gotta headspace on the shoulder. Their shoulders should be set back 2/1000ths to 3/1000ths (.002 to .003) of an inch from their fired position. Doing this with a .308 Win. case made by Winchester and with a full-length sizing die reducing body diameters about .003-inch has got me at least 60 loads per case cause that's the most I ever reloaded one. Others doing this get 80 to 100 reloads per case. (Anybody ever get that many reloads on any other make case?) Setting fired rimless bottleneck case shoulders back more than about .003-inch will indeed shorten case life. I'm convinced this is why so many folks like to neck-only size or partial-neck size their rimless cases. They set the shoulder back way too far and don't have/use a case headspace gage to measure exactly what they're doing. They over do it full-length sizing and start neck-only sizing and claim better accuracy by doing so. They're right. But if they just got a case headspace gage (RCBS Precision Mic, Stoney Point, there's some that's been available someplace since the 1960's) and used it properly to set up their full-length sizing die, wonderous things would happen. [/QUOTE]
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Stoneypoint Headspace gauge
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