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Rifles, Reloading, Optics, Equipment
Reloading
Redding instant indicator
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<blockquote data-quote="Jimm" data-source="post: 116871" data-attributes="member: 9"><p>Thanks guys for the input .</p><p></p><p> After reading all that has been suggested here I put them to work ................but ! not until I measured a larger sample of cases . Glad I did that as the 100 case sampling changed the percentages a bit , ok , a lot . A great case in point for large sample numbers as the math whizzes insist upon . </p><p></p><p> The cases that are .005 longer than min sammi spec are in the minority ( 10% ? ) . The largest number of cases ( haven't put a calculator to this to get exact percentage , but roughly is 80% ) measure .006 to .0065 longer with the last group going .007 to .00725 ( 10% ?)( these numbers past the thou mark are approximations of the figures indicated by my dial caliper which is only gradated to the thou. Thinking about this a bit cause me to realize that those percentages are probably a close approximation of the ladder test loads by charge weight . That is to say 10% at he low pressure end , 80 % in the middle normal working pressure loads and 10% at the high pressure end . </p><p></p><p> After the long winded session of measuring several points on the cases I have this info to share .</p><p></p><p> new lapua cases......... belt .529 all </p><p> forward of belt......... .508 to .509</p><p> Extractor groove ....... .451 to .452</p><p> shoulder body junction.. .488</p><p></p><p></p><p> 4 fired cases .005 longer than min.</p><p> belt...................... .532 to .533</p><p> forward of belt ....... .513 to .514</p><p> extractor groove ....... .453 to .455</p><p> shoulder body junction . .490 , all </p><p></p><p></p><p> 4 fired cases .006 longer </p><p> belt .................... .532 to .533</p><p> forward of belt ....... .513 to .514</p><p> extractor groove ....... .453 to .456 ( one case at .456)</p><p> shoulder body junction. .490 </p><p></p><p></p><p> 4 fired cases .007 longer </p><p> belt .................... .533 to .534</p><p> forward of belt ....... .514 to .515</p><p> extractor groove ....... .455 to .457</p><p> shoulder body junction. .490 all </p><p></p><p> Moving on to the " close the bolt on a fired case " test results were as following:</p><p></p><p> .005 longer...... almost no difference from the closing without a case in the chamber .</p><p></p><p> .006 longer...... noticeable difference from the .005 cases but not any big diff, just enough to notice . </p><p></p><p> .007 longer...... big diff even from .006 cases , very big increase in effort , also uneven spots in closure , kinda draggy rough . </p><p></p><p> At this point I am thinking that .oo6 longer is very close to chamber actual . Thinking that actual may be right at .0065. </p><p></p><p> I suppose a Cerrosafe cast would answer this more definitively , but I am a bit apprehensive about a procedure that use molten metal in my LSR hammer . Just occurred to me to do a trial on one of my takeoff bbls .That would be fun and no tension involved . </p><p> </p><p> Jim B.</p></blockquote><p></p>
[QUOTE="Jimm, post: 116871, member: 9"] Thanks guys for the input . After reading all that has been suggested here I put them to work ................but ! not until I measured a larger sample of cases . Glad I did that as the 100 case sampling changed the percentages a bit , ok , a lot . A great case in point for large sample numbers as the math whizzes insist upon . The cases that are .005 longer than min sammi spec are in the minority ( 10% ? ) . The largest number of cases ( haven't put a calculator to this to get exact percentage , but roughly is 80% ) measure .006 to .0065 longer with the last group going .007 to .00725 ( 10% ?)( these numbers past the thou mark are approximations of the figures indicated by my dial caliper which is only gradated to the thou. Thinking about this a bit cause me to realize that those percentages are probably a close approximation of the ladder test loads by charge weight . That is to say 10% at he low pressure end , 80 % in the middle normal working pressure loads and 10% at the high pressure end . After the long winded session of measuring several points on the cases I have this info to share . new lapua cases......... belt .529 all forward of belt......... .508 to .509 Extractor groove ....... .451 to .452 shoulder body junction.. .488 4 fired cases .005 longer than min. belt...................... .532 to .533 forward of belt ....... .513 to .514 extractor groove ....... .453 to .455 shoulder body junction . .490 , all 4 fired cases .006 longer belt .................... .532 to .533 forward of belt ....... .513 to .514 extractor groove ....... .453 to .456 ( one case at .456) shoulder body junction. .490 4 fired cases .007 longer belt .................... .533 to .534 forward of belt ....... .514 to .515 extractor groove ....... .455 to .457 shoulder body junction. .490 all Moving on to the " close the bolt on a fired case " test results were as following: .005 longer...... almost no difference from the closing without a case in the chamber . .006 longer...... noticeable difference from the .005 cases but not any big diff, just enough to notice . .007 longer...... big diff even from .006 cases , very big increase in effort , also uneven spots in closure , kinda draggy rough . At this point I am thinking that .oo6 longer is very close to chamber actual . Thinking that actual may be right at .0065. I suppose a Cerrosafe cast would answer this more definitively , but I am a bit apprehensive about a procedure that use molten metal in my LSR hammer . Just occurred to me to do a trial on one of my takeoff bbls .That would be fun and no tension involved . Jim B. [/QUOTE]
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