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Rifles, Reloading, Optics, Equipment
Reloading
Ballistic Calculator instead of Chronograph
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<blockquote data-quote="SBruce" data-source="post: 523402" data-attributes="member: 21068"><p>In my experiences, 300 isn't far enough to validate velocity by only using a program. We have to have a rifle that shoots basically "one hole" at 100 to know our <u>TRUE zero</u>, We also gotta know the exact height of our sights/scope before the ballistic program will be dead on at 300. I've often seen discrepancies at 300 from what the programs say, even with cronographed loads. I always concluded it was because of the close range "zero" not being exact.?</p><p> </p><p>Now, that being said.....if we zero ~ 100, shoot at 300 and record drop, then shoot at 500 and record drop, then we can use the ballistic program to get close on velocity. It takes a big difference in BC to make much difference in drops when we're talking 500 and less, so the velocity is the biggest determining factor of difference in drop between 300 and 500 IMO.</p><p> </p><p>As others have mentioned, a crono is a great tool to have. A cheap one may not give real reliable ES and SD's, but it will get you close on velocity at least.</p></blockquote><p></p>
[QUOTE="SBruce, post: 523402, member: 21068"] In my experiences, 300 isn't far enough to validate velocity by only using a program. We have to have a rifle that shoots basically "one hole" at 100 to know our [U]TRUE zero[/U], We also gotta know the exact height of our sights/scope before the ballistic program will be dead on at 300. I've often seen discrepancies at 300 from what the programs say, even with cronographed loads. I always concluded it was because of the close range "zero" not being exact.? Now, that being said.....if we zero ~ 100, shoot at 300 and record drop, then shoot at 500 and record drop, then we can use the ballistic program to get close on velocity. It takes a big difference in BC to make much difference in drops when we're talking 500 and less, so the velocity is the biggest determining factor of difference in drop between 300 and 500 IMO. As others have mentioned, a crono is a great tool to have. A cheap one may not give real reliable ES and SD's, but it will get you close on velocity at least. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Ballistic Calculator instead of Chronograph
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