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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
shooting chrony
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<blockquote data-quote="Brent" data-source="post: 25305" data-attributes="member: 99"><p>4mesh063,</p><p></p><p>You probably know more about cronies than I do but what I stated is fact you can either dispute or not, makes no difference to me. Wish you were right though, the crony's are very handy. I used to go out and set mine on a stump, fire my loads, head back and reload. Real fast with the Alpha model. You explain to me why the 2700 fps reading went to 2550 on the Alpha and the 2650 reading on the F1 went to 2750 and stayed around the same a couple shots then one would drop while the other stayed the same then out of the blue a big reversal from hell again happened? There's only a few reasons and they're obvious, but when they do it over and over and over and over and over again... BOTH units have issues only they can control.</p><p></p><p>Darryl has a 35P, set yours in front of his at the range next time and see for yourself. He'll explain how they work as well. <img src="http://images/icons/wink.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p><strong>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. </strong></p><p></p><p>If the crony is varying more than the load, this is impossible to get any meaningfull data from it, if in fact YOUR crony is found to be, mine BOTH were.</p><p></p><p><strong>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.</strong></p><p><strong></strong></p><p><strong>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. </strong></p><p></p><p></p><p>How it works... The first screen starts both timers as the bullet passes the second screen it stops the proof channel timer, as it passes the third screen it stops the MAIN timer. There is only ONE start and TWO stops switches. The screens are easily placed accuratly on the rail an even and measured distance apart. Oehler supplied two or four foot rails have indents pressed into them to run the set screws into for perfect spacing on each screen as well. </p><p></p><p><strong>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. </strong></p><p></p><p>Why make assumptions about something you admit you have no experience with? The program you refer to, I happen to like it alot, but it's not a demo either. Hung?</p></blockquote><p></p>
[QUOTE="Brent, post: 25305, member: 99"] 4mesh063, You probably know more about cronies than I do but what I stated is fact you can either dispute or not, makes no difference to me. Wish you were right though, the crony's are very handy. I used to go out and set mine on a stump, fire my loads, head back and reload. Real fast with the Alpha model. You explain to me why the 2700 fps reading went to 2550 on the Alpha and the 2650 reading on the F1 went to 2750 and stayed around the same a couple shots then one would drop while the other stayed the same then out of the blue a big reversal from hell again happened? There's only a few reasons and they're obvious, but when they do it over and over and over and over and over again... BOTH units have issues only they can control. Darryl has a 35P, set yours in front of his at the range next time and see for yourself. He'll explain how they work as well. [img]images/icons/wink.gif[/img] [B]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. [/B] If the crony is varying more than the load, this is impossible to get any meaningfull data from it, if in fact YOUR crony is found to be, mine BOTH were. [B]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. [/B] How it works... The first screen starts both timers as the bullet passes the second screen it stops the proof channel timer, as it passes the third screen it stops the MAIN timer. There is only ONE start and TWO stops switches. The screens are easily placed accuratly on the rail an even and measured distance apart. Oehler supplied two or four foot rails have indents pressed into them to run the set screws into for perfect spacing on each screen as well. [B]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. [/B] Why make assumptions about something you admit you have no experience with? The program you refer to, I happen to like it alot, but it's not a demo either. Hung? [/QUOTE]
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