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screwed up 308
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<blockquote data-quote="rjb" data-source="post: 9006" data-attributes="member: 1145"><p>Please pardon the peek at your 308 "problemo"</p><p>Some times this done right can equal odd results as you mentioned. Lets assume your</p><p>gunsmith was diligent and excellant craftsman. Still your factory action according to above had poor lug contact. How</p><p>was the "repaired". No flame here just note</p><p>the customary procedure is to use abrasive lapping compound and work the surfaces of </p><p>bolt lugs over untill a better more uniform</p><p>contact area results. That's OK BUT at same time whatever lug thickness is ground away to make both lugs contact ADDs to the bolt headspace. Headspace being roughly put the</p><p>fit of loaded rounds contacting chamber walls</p><p>and shoulder area. This fit is key to centering rounds for accuracy. The factory</p><p>"fit" is fixed. So it's possible the "cure"</p><p>has changed the alighnment (at least until the bolt warms up). Handloaded rounds can compensate i.e. used fireformed brass, neck sized only and bullets seated close to rifling contact. All that componant variables</p><p>can change the accuracy +/- of chambered rounds. That's what makes chasing accurate loads so ^^$&*#@ much fun. <img src="http://images/icons/wink.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> rjb</p></blockquote><p></p>
[QUOTE="rjb, post: 9006, member: 1145"] Please pardon the peek at your 308 "problemo" Some times this done right can equal odd results as you mentioned. Lets assume your gunsmith was diligent and excellant craftsman. Still your factory action according to above had poor lug contact. How was the "repaired". No flame here just note the customary procedure is to use abrasive lapping compound and work the surfaces of bolt lugs over untill a better more uniform contact area results. That's OK BUT at same time whatever lug thickness is ground away to make both lugs contact ADDs to the bolt headspace. Headspace being roughly put the fit of loaded rounds contacting chamber walls and shoulder area. This fit is key to centering rounds for accuracy. The factory "fit" is fixed. So it's possible the "cure" has changed the alighnment (at least until the bolt warms up). Handloaded rounds can compensate i.e. used fireformed brass, neck sized only and bullets seated close to rifling contact. All that componant variables can change the accuracy +/- of chambered rounds. That's what makes chasing accurate loads so ^^$&*#@ much fun. [img]images/icons/wink.gif[/img] rjb [/QUOTE]
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