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Rifles, Reloading, Optics, Equipment
Reloading
seating depth increments
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<blockquote data-quote="Shootin4fun" data-source="post: 1306034" data-attributes="member: 28741"><p>Yes, I believe this to be true in the sense that there is an optimum depth for different charge levels. As such, there is always some tail chasing involved unless I just get lucky and start with 2 variables that work together, give good accuracy, and don't show pressure signs. So there is significant trial and error involved. </p><p></p><p>Mike proposes that seating depth has a much greater affect on grouping than charge weight steps. Others claim the opposite. Interesting, in the Berger article they say "This sweet spot is a band .030 to .040 wide and is located anywhere between jamming the bullets into the lands and .150 jump off the lands." .030 - .040 wide! </p><p></p><p>On a related note, sample size- for me anyway, working with sporter barrels, group size may vary due to shooting technique not being perfect all the time. No way could I do a string of 1 or 2 shots at each charge level as some suggest in order to find a vertical plateau. I shoot minimum 3, max 5 at each charge level. Unless it's cold and cloudy out, I have now taken to using ice bags in order to compress the time for barrel cooling or else I just can't get enough testing done in one day.</p></blockquote><p></p>
[QUOTE="Shootin4fun, post: 1306034, member: 28741"] Yes, I believe this to be true in the sense that there is an optimum depth for different charge levels. As such, there is always some tail chasing involved unless I just get lucky and start with 2 variables that work together, give good accuracy, and don't show pressure signs. So there is significant trial and error involved. Mike proposes that seating depth has a much greater affect on grouping than charge weight steps. Others claim the opposite. Interesting, in the Berger article they say "This sweet spot is a band .030 to .040 wide and is located anywhere between jamming the bullets into the lands and .150 jump off the lands." .030 - .040 wide! On a related note, sample size- for me anyway, working with sporter barrels, group size may vary due to shooting technique not being perfect all the time. No way could I do a string of 1 or 2 shots at each charge level as some suggest in order to find a vertical plateau. I shoot minimum 3, max 5 at each charge level. Unless it's cold and cloudy out, I have now taken to using ice bags in order to compress the time for barrel cooling or else I just can't get enough testing done in one day. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
seating depth increments
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