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The Basics, Starting Out
What does this grouping mean?
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<blockquote data-quote="Tac-O" data-source="post: 1816819" data-attributes="member: 109994"><p>That's really interesting how large an impact just 0.010 seating depth has on grouping. I tried sorting out my bullets on my last round of loading to weight first, then to bullet base to ogive. There didn't seem to be much correlation between the weight and BTO on the bullets. So, I threw out the outliers in the BTO measurement, and loaded the bullets that were closest in weight and BTO.</p><p></p><p>I'm using a Lee hand press and Lee dies. So, of course they're not top of the line, but I think I do a pretty good job with them anyway. The closest I was able to get on my CBTO with these was 2.730-2.732. I don't know how much of a difference a couple thou would make, but it doesn't seem like it would make a huge difference. </p><p></p><p>I'll load another 20 rounds at some point with one of my better loads, maybe the 57.5-57.8 and 59.6-59.9 with a few different seating depths.</p></blockquote><p></p>
[QUOTE="Tac-O, post: 1816819, member: 109994"] That's really interesting how large an impact just 0.010 seating depth has on grouping. I tried sorting out my bullets on my last round of loading to weight first, then to bullet base to ogive. There didn't seem to be much correlation between the weight and BTO on the bullets. So, I threw out the outliers in the BTO measurement, and loaded the bullets that were closest in weight and BTO. I'm using a Lee hand press and Lee dies. So, of course they're not top of the line, but I think I do a pretty good job with them anyway. The closest I was able to get on my CBTO with these was 2.730-2.732. I don't know how much of a difference a couple thou would make, but it doesn't seem like it would make a huge difference. I'll load another 20 rounds at some point with one of my better loads, maybe the 57.5-57.8 and 59.6-59.9 with a few different seating depths. [/QUOTE]
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The Basics, Starting Out
What does this grouping mean?
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