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Rifles, Reloading, Optics, Equipment
Reloading
Help with 300RUM 215 Berger and ES
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<blockquote data-quote="Vulture" data-source="post: 1128351" data-attributes="member: 29159"><p>Thank you for the replies, they are both very helpful. Phil, I find yours especially helpful because it seems that most of what I read, people tend to do the opposite, find an accurate load and then "start playing around with seating depth" as I've read countless times. Your description of the affect of standard deviation makes a lot of sense, and honestly I thought the result of high ES would be vertical dispersion. Attached is a sample group, which I had been attributing this vertical dispersion to either ES or shots stringing from the sporter barrel heating up. This is at 200yds, in the same session I shot a 5 shot group at 300yds that had .75" of horizontal dispersion, and around 2" of vertical. Thinking about it mathematically (and I never thought statistics classes in business school would be relevant), I can see where ES is no nearly as relevant. I could have a really low SD, and one inconsistent load that puts ES into a wide gap, but really wouldn't be relevant to average shot performance. Here's some more info on my load which I used my RCBS balance beam (instead of the hornady digital) and was very meticulous to make sure the powder charges were the same, down to the last particle of powder, it sounds like I'll be starting over in January and determine my jump, and work up from there.</p><p></p><p>215 Berger Hybrid</p><p>Remington Brass (It's taken 3 firings to exceed 2.850" so I now have some to trim)</p><p>Federal 215 primers</p><p>92.5 grains H1000 </p><p>.050" jump (I went with this because of anecdotal posts stating it worked well with the 215's)</p><p>Avg. COAL 3.865", varies but I used a bullet comparator when setting up my die for the .050" jump</p><p>AVG 3130 FPS</p><p>SD 22</p><p>ES 55</p></blockquote><p></p>
[QUOTE="Vulture, post: 1128351, member: 29159"] Thank you for the replies, they are both very helpful. Phil, I find yours especially helpful because it seems that most of what I read, people tend to do the opposite, find an accurate load and then "start playing around with seating depth" as I've read countless times. Your description of the affect of standard deviation makes a lot of sense, and honestly I thought the result of high ES would be vertical dispersion. Attached is a sample group, which I had been attributing this vertical dispersion to either ES or shots stringing from the sporter barrel heating up. This is at 200yds, in the same session I shot a 5 shot group at 300yds that had .75" of horizontal dispersion, and around 2" of vertical. Thinking about it mathematically (and I never thought statistics classes in business school would be relevant), I can see where ES is no nearly as relevant. I could have a really low SD, and one inconsistent load that puts ES into a wide gap, but really wouldn't be relevant to average shot performance. Here's some more info on my load which I used my RCBS balance beam (instead of the hornady digital) and was very meticulous to make sure the powder charges were the same, down to the last particle of powder, it sounds like I'll be starting over in January and determine my jump, and work up from there. 215 Berger Hybrid Remington Brass (It's taken 3 firings to exceed 2.850" so I now have some to trim) Federal 215 primers 92.5 grains H1000 .050" jump (I went with this because of anecdotal posts stating it worked well with the 215's) Avg. COAL 3.865", varies but I used a bullet comparator when setting up my die for the .050" jump AVG 3130 FPS SD 22 ES 55 [/QUOTE]
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Help with 300RUM 215 Berger and ES
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