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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy or low ES?
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<blockquote data-quote="6.5x300" data-source="post: 1041805" data-attributes="member: 10713"><p>Just ran a quick JBM ballistic calculation on a simple 180 grain 30 cal bullet drop at 1000 yrds. A 100 FPS difference between 3000 and 3100fps equaled roughly 20" difference at 1000yrds. </p><p> </p><p>So the numbers would suggest........ </p><p> </p><p>The 1" group at 100yrs with 10 ES should have a max group of 12" (10" plus the 10 ES difference of 2") at 1000 yrds. </p><p> </p><p>The .25" group at 100 with the 100 ES should have a max group size of 22.5" (2.5" plus the 20" ES difference) at 1000 yrds </p><p> </p><p>Of course this is in a perfect world with no other factors involved but??????? </p><p> </p><p>Does this make since? Am I to understand this correctly? It certainly is interesting and I look forward to what you guys have to add.</p><p> </p><p>Thanks.</p><p> </p><p>BT</p></blockquote><p></p>
[QUOTE="6.5x300, post: 1041805, member: 10713"] Just ran a quick JBM ballistic calculation on a simple 180 grain 30 cal bullet drop at 1000 yrds. A 100 FPS difference between 3000 and 3100fps equaled roughly 20" difference at 1000yrds. So the numbers would suggest........ The 1" group at 100yrs with 10 ES should have a max group of 12" (10" plus the 10 ES difference of 2") at 1000 yrds. The .25" group at 100 with the 100 ES should have a max group size of 22.5" (2.5" plus the 20" ES difference) at 1000 yrds Of course this is in a perfect world with no other factors involved but??????? Does this make since? Am I to understand this correctly? It certainly is interesting and I look forward to what you guys have to add. Thanks. BT [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy or low ES?
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