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Rifles, Reloading, Optics, Equipment
Reloading
7mm Rem mag, 168gr vld & retumbo load data?
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<blockquote data-quote="KYpatriot" data-source="post: 1149488" data-attributes="member: 48028"><p>I had great groups with retumbo in my 7 mag with both 175lrab and the berger 180 hybrid, including some in the .2s. It just flat out shot well. The problem was I could never get the ES down to less than 30. I shot a 100 yard group with the 180s that was .3 moa, and the ES was 80! Also I started seeing pressure when it was hot outside.</p><p></p><p>H1000 has proved more consistent, high 20s in ES, SD around 10, about 50-60 fps slower, although groups hover around .5 or so. </p><p></p><p>If you are using 3 shot strings for ES data then you arent getting a real picture of the true performance. You really need 10-15 shots to have an inkling of real life performance. </p><p></p><p>For long range, I think focusing on group size more than ES is a mistake, velocity consistency is at least as important. Getting SD into the single digits ought to be the goal. Remember what these numbers are telling you...that 95% of your shots will be within two standad deviations. if you have an SD of 10, then 95% of your rounds will be + or - 20fps of the average. Thats a true extreme spread of 40 fps, and 5% will even be outside of that!</p></blockquote><p></p>
[QUOTE="KYpatriot, post: 1149488, member: 48028"] I had great groups with retumbo in my 7 mag with both 175lrab and the berger 180 hybrid, including some in the .2s. It just flat out shot well. The problem was I could never get the ES down to less than 30. I shot a 100 yard group with the 180s that was .3 moa, and the ES was 80! Also I started seeing pressure when it was hot outside. H1000 has proved more consistent, high 20s in ES, SD around 10, about 50-60 fps slower, although groups hover around .5 or so. If you are using 3 shot strings for ES data then you arent getting a real picture of the true performance. You really need 10-15 shots to have an inkling of real life performance. For long range, I think focusing on group size more than ES is a mistake, velocity consistency is at least as important. Getting SD into the single digits ought to be the goal. Remember what these numbers are telling you...that 95% of your shots will be within two standad deviations. if you have an SD of 10, then 95% of your rounds will be + or - 20fps of the average. Thats a true extreme spread of 40 fps, and 5% will even be outside of that! [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
7mm Rem mag, 168gr vld & retumbo load data?
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