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Hunting
Long Range Hunting & Shooting
Fast Barrel on my Cooper?
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<blockquote data-quote="rscott5028" data-source="post: 684702" data-attributes="member: 24624"><p>it's not just the barrel length that matters if comparing to published load data</p><p> </p><p>diferences in chamber+brass+temp+altitude+powder lot+twist rate and/or chrony error can all cancel or stack up to easily 150+/- fps</p><p> </p><p>in fact, it doesn't look like you're using a chrony </p><p>rather, it appears you're calculating mv off of come-ups vs POI</p><p> </p><p>so, now you've got possible error in published scope adjustment per click vs actual, plus sampling error from group sizes, variable MV SD/ES, and published vs confirmed BC</p><p> </p><p>you're actually not doing bad</p><p> </p><p>just keep shooting without making changes and make sure everything is consistent before you adjust</p><p> </p><p>-- richard</p></blockquote><p></p>
[QUOTE="rscott5028, post: 684702, member: 24624"] it's not just the barrel length that matters if comparing to published load data diferences in chamber+brass+temp+altitude+powder lot+twist rate and/or chrony error can all cancel or stack up to easily 150+/- fps in fact, it doesn't look like you're using a chrony rather, it appears you're calculating mv off of come-ups vs POI so, now you've got possible error in published scope adjustment per click vs actual, plus sampling error from group sizes, variable MV SD/ES, and published vs confirmed BC you're actually not doing bad just keep shooting without making changes and make sure everything is consistent before you adjust -- richard [/QUOTE]
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Fast Barrel on my Cooper?
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