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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
shooting chrony
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<blockquote data-quote="4mesh063" data-source="post: 25304" data-attributes="member: 941"><p>Sambo, </p><p></p><p>I'd say those numbers go hand in hand with my Rem 22-250. When you think about it, that's within 3% all the time. Now, if you were talking about your 6ppc Match gun, I'd say find a new sport. Your throat in that gun isn't tight and if it's newer than a 1997 gun from remington, it's freebored. That leakage alone is enough to give you 100-150 fps spread. Try different primers and see if a faster or slower ignition helps the spread. Don't throw out your chrony just yet, My Pact gives me numbers just like that and I beleive it. Shoot groups at 500yds with the 22-250 and videotape the bullets comming in. I put my videocamera just off the side of the target. Try not to shoot it. Your shooting chrony is warranted for that. Your JVC Digital Camcorder is not. Then compare to the chrony slip and see if the chrony is right. It is! Your slow shots will be lower and the fast ones will be higher. </p><p></p><p>How accurate is it? Who cares. As long as you use only one chrony to make comparisons all you're looking for is the variation and patterning of velocity. </p><p></p><p>Ohler makes a unit that "double checks itself". I have serious doubt as to the validity of that. I looked into building a chrony and even bought the components. The timing of 2 gates in series seems to me to be a farse. If they wanted to really double check, put in 2 timers that read 2 phototransistors that are both under the same lens. NOW you get 2 readings from the same set of circumstances. Trouble is now you have 2 chronys.</p><p></p><p>Think about it. You have a bullet traveling over 3 lenses. 1 is a start. 2 is a stop for the first timer and a start for the next. 3 is a stop for timer 2. Now, the unit is counting at a rate of about 100,000,000 times a second to truly acheive the accuracy that the companies tout. What do you think that the odds are that the rail that the screens set upon are spaced evenly enough to realistically determine if the reading was good. ********. Great marketing. I'm sure the unit is plenty accurate. I just don't like the idea that it chooses which number it likes best and gives me that one. </p><p></p><p>I have no experience with Ohler other than using thier demo software from the web site. I sure as hell hope thier chronys work better than that. Whoever wrote that software ought to be hung in market square for all to see. </p><p></p><p>Rechamber your gun with no freebore, fix your case necks so they don't leak, seat your bullets farther out and your chrony will be fixed.</p></blockquote><p></p>
[QUOTE="4mesh063, post: 25304, member: 941"] Sambo, I'd say those numbers go hand in hand with my Rem 22-250. When you think about it, that's within 3% all the time. Now, if you were talking about your 6ppc Match gun, I'd say find a new sport. Your throat in that gun isn't tight and if it's newer than a 1997 gun from remington, it's freebored. That leakage alone is enough to give you 100-150 fps spread. Try different primers and see if a faster or slower ignition helps the spread. Don't throw out your chrony just yet, My Pact gives me numbers just like that and I beleive it. Shoot groups at 500yds with the 22-250 and videotape the bullets comming in. I put my videocamera just off the side of the target. Try not to shoot it. Your shooting chrony is warranted for that. Your JVC Digital Camcorder is not. Then compare to the chrony slip and see if the chrony is right. It is! Your slow shots will be lower and the fast ones will be higher. How accurate is it? Who cares. As long as you use only one chrony to make comparisons all you're looking for is the variation and patterning of velocity. Ohler makes a unit that "double checks itself". I have serious doubt as to the validity of that. I looked into building a chrony and even bought the components. The timing of 2 gates in series seems to me to be a farse. If they wanted to really double check, put in 2 timers that read 2 phototransistors that are both under the same lens. NOW you get 2 readings from the same set of circumstances. Trouble is now you have 2 chronys. Think about it. You have a bullet traveling over 3 lenses. 1 is a start. 2 is a stop for the first timer and a start for the next. 3 is a stop for timer 2. Now, the unit is counting at a rate of about 100,000,000 times a second to truly acheive the accuracy that the companies tout. What do you think that the odds are that the rail that the screens set upon are spaced evenly enough to realistically determine if the reading was good. ********. Great marketing. I'm sure the unit is plenty accurate. I just don't like the idea that it chooses which number it likes best and gives me that one. I have no experience with Ohler other than using thier demo software from the web site. I sure as hell hope thier chronys work better than that. Whoever wrote that software ought to be hung in market square for all to see. Rechamber your gun with no freebore, fix your case necks so they don't leak, seat your bullets farther out and your chrony will be fixed. [/QUOTE]
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