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Long Range Hunting & Shooting
God groups but bad ES
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<blockquote data-quote="azgutpile" data-source="post: 487495" data-attributes="member: 18796"><p>I have a custom built 300 RUM that I had built two years ago that It shoots sub 1/4" MOA from 100 to 700 yards (3 shot groups); however, when I use my chrono, it shows an ES of about 25 fps. Even if I throw out the most extreme velocities, it would still show an ES of 20 fps. What can be causing this? </p><p> </p><p>When I shoot at 750 yards, the groups tend to be slightly more horizontal than vertical.</p><p> </p><p>Here are the specs of my rifle.</p><p> </p><p>Stiller Predator Action</p><p>Schneider P5 barrel, 1:11 twist -</p><p>5.5 taper, 28"+ Muzzle Break</p><p>McMillan A 3-5 Stock</p><p>5.5x22x56 Night Force</p><p>Badger Rings </p><p> </p><p>Nosler Brass</p><p>86 grains of H1,000</p><p>Federal 215 M Primers</p><p>Berger 210 Hunting VLDs</p><p>loaded .020 off the lands</p><p>OAL is 3.798 (4.127 with comparator)</p><p>2,988 to 3,013 FPS </p><p> </p><p>I measure every load exactly on an older RCBS Balance Beam scale</p><p>RCBS rock chucker press</p><p>RCBS full length dies and seater</p><p> </p><p>Just as an FYI, I have no problem achieving a low ES when I reload for my friends 300 RUM (6- ES), or my Kimber 300WSM (9- ES); however these guns only average .75" group at 100 yards.</p><p> </p><p>The other thing that is throwing me off is when I last shot at 750 yards; I shot 3 groups that were (1.5") (3.2") (2.5"). When I do the math on my Ipod (ballistic FTE), and figure a 25 fps ES, my bullets should be printing in a 6" vertical group. </p><p> </p><p>I know I should be happy with what I'm getting, but I can't help but think what my 1,000 yard groups would be like if I had an ES of 5?</p><p> </p><p>Where should I begin my search for th cure?</p><p> </p><p>Justin</p></blockquote><p></p>
[QUOTE="azgutpile, post: 487495, member: 18796"] I have a custom built 300 RUM that I had built two years ago that It shoots sub 1/4" MOA from 100 to 700 yards (3 shot groups); however, when I use my chrono, it shows an ES of about 25 fps. Even if I throw out the most extreme velocities, it would still show an ES of 20 fps. What can be causing this? When I shoot at 750 yards, the groups tend to be slightly more horizontal than vertical. Here are the specs of my rifle. Stiller Predator Action Schneider P5 barrel, 1:11 twist - 5.5 taper, 28"+ Muzzle Break McMillan A 3-5 Stock 5.5x22x56 Night Force Badger Rings Nosler Brass 86 grains of H1,000 Federal 215 M Primers Berger 210 Hunting VLDs loaded .020 off the lands OAL is 3.798 (4.127 with comparator) 2,988 to 3,013 FPS I measure every load exactly on an older RCBS Balance Beam scale RCBS rock chucker press RCBS full length dies and seater Just as an FYI, I have no problem achieving a low ES when I reload for my friends 300 RUM (6- ES), or my Kimber 300WSM (9- ES); however these guns only average .75" group at 100 yards. The other thing that is throwing me off is when I last shot at 750 yards; I shot 3 groups that were (1.5") (3.2") (2.5"). When I do the math on my Ipod (ballistic FTE), and figure a 25 fps ES, my bullets should be printing in a 6" vertical group. I know I should be happy with what I'm getting, but I can't help but think what my 1,000 yard groups would be like if I had an ES of 5? Where should I begin my search for th cure? Justin [/QUOTE]
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God groups but bad ES
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