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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Come on out - It's safe now
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<blockquote data-quote="Jon A" data-source="post: 78186" data-attributes="member: 319"><p><strong>Re: Come on out - It\'s safe now</strong></p><p></p><p>You would need to calibrate the two chronographs to each other by putting one right after the other and shooting over them to see if one consistantly reads higher than the other and by how much; then swaping their positions and doing it again. Hopefully you'd be able to find a repeatable pattern you could use to correct your velocities from one to the other. If they average the same but differ by a random amount shot to shot you aren't gaining a whole lot--but hopefully that wouldn't be the case.</p><p></p><p>Done with two <em>good</em> chronographs calibrated correctly, of course will be more accurate. But not many have access to two Oehlers. I don't think that means they should do nothing.</p><p></p><p>Doing it with one good chronograph is certainly better than nothing--which is what most are doing right now. When SD's are in the single digits and one bullet on average loses 30, 50, 100 or 170 fps more than another, you may not have a number down to the last .001 with enough statistical assurance you'd bet the mortgage on it, but you sure have better data than when you started. You'll be in the ballpark.</p></blockquote><p></p>
[QUOTE="Jon A, post: 78186, member: 319"] [b]Re: Come on out - It\'s safe now[/b] You would need to calibrate the two chronographs to each other by putting one right after the other and shooting over them to see if one consistantly reads higher than the other and by how much; then swaping their positions and doing it again. Hopefully you'd be able to find a repeatable pattern you could use to correct your velocities from one to the other. If they average the same but differ by a random amount shot to shot you aren't gaining a whole lot--but hopefully that wouldn't be the case. Done with two [i]good[/i] chronographs calibrated correctly, of course will be more accurate. But not many have access to two Oehlers. I don't think that means they should do nothing. Doing it with one good chronograph is certainly better than nothing--which is what most are doing right now. When SD's are in the single digits and one bullet on average loses 30, 50, 100 or 170 fps more than another, you may not have a number down to the last .001 with enough statistical assurance you'd bet the mortgage on it, but you sure have better data than when you started. You'll be in the ballpark. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Come on out - It's safe now
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