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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How Do You Get A Low "ES" Velocity Number ??
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<blockquote data-quote="Shawn Carlock" data-source="post: 173149" data-attributes="member: 4"><p>I guess I should have clarified by post a little more. I too agree that powder charge/primer selection are the biggest keys to low ES, by far. Once you have gotten as far as your going to go with that to get the lowest possible you work the neck tension and case volume. Graphiting the neck directly effects consistant neck tension. Everyting else is geared around consistant volume and jump to the rifling. When I first realized the huge effect of ES at extreme distances and started to look at how to lower it in one of my first Edge's the first thing I did was switch from FED Mag. Match primers to CCI 250's and cut my ES almost in half and was in the mid to low teens. Graphite, consistant bullets, consistant seating depth based on forward baring surface, and case weight got me into mid and low single digits. Loaded like this out of 10 rounds I get 6 or 7 exaclty the same. I shot some test groups @ 1276 yards with a 5-8 ES group and a 12-14 ES group and got a average group difference of 1.7 inches. A 25 ES group was scary in comparison. GG is absolutly correct in saying that powder / primer combos are by far the most important, it just depends on how much performance your after as to how much work you want to put into it. I am the king of I like to shoot not reload so I don't invest my time in reloading activities that have not proven to be a benefit. Hope this helps. In the end alot of people have different experiences and opinions and this is mine.</p></blockquote><p></p>
[QUOTE="Shawn Carlock, post: 173149, member: 4"] I guess I should have clarified by post a little more. I too agree that powder charge/primer selection are the biggest keys to low ES, by far. Once you have gotten as far as your going to go with that to get the lowest possible you work the neck tension and case volume. Graphiting the neck directly effects consistant neck tension. Everyting else is geared around consistant volume and jump to the rifling. When I first realized the huge effect of ES at extreme distances and started to look at how to lower it in one of my first Edge's the first thing I did was switch from FED Mag. Match primers to CCI 250's and cut my ES almost in half and was in the mid to low teens. Graphite, consistant bullets, consistant seating depth based on forward baring surface, and case weight got me into mid and low single digits. Loaded like this out of 10 rounds I get 6 or 7 exaclty the same. I shot some test groups @ 1276 yards with a 5-8 ES group and a 12-14 ES group and got a average group difference of 1.7 inches. A 25 ES group was scary in comparison. GG is absolutly correct in saying that powder / primer combos are by far the most important, it just depends on how much performance your after as to how much work you want to put into it. I am the king of I like to shoot not reload so I don't invest my time in reloading activities that have not proven to be a benefit. Hope this helps. In the end alot of people have different experiences and opinions and this is mine. [/QUOTE]
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How Do You Get A Low "ES" Velocity Number ??
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