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Rifles, Reloading, Optics, Equipment
Reloading
Baffling Reults, Please Help!
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<blockquote data-quote="Wile E Coyote" data-source="post: 582453" data-attributes="member: 28381"><p>I have the same chrono and had similar issues; A Shooting Chrony Beta Master. I also have the LED light kit they sell. </p><p> </p><p>A few months ago I was working up a couple loads for my 7 mag and found I was getting bogus numbers. I had both a sunny afternoon and an overcast day with the same issues. Some shots in the string were <em>apparently</em> good while one or two in a 10 shot string were obviously too low. I just discarded those numbers. The apparent good numbers were in the 3200 + fps range while the bad numbers were half that. As it turns out most those "good" numbers were NG also. They were actually about 3050 or so. </p><p> </p><p>To start, there is probably nothing wrong with the chrono. It's just giving you a number for each shot based on what it sees. To make a long story short, the Numbers that were too high were caused by the muzzle blast upsetting the timing. A portion of the blast apparently either gets to the first eye before the bullet does and/or the blast outruns the bullet to the second eye. either way, the reading is bogus. Secondly the low numbers were caused by one of two things. A) the bullet path was slightly to the side of the eye or B) one day, the shooter ajacent to me was shooting a muzzleloader and the smoke and pressure wave would start and stop the clock and record a number. </p><p> </p><p> </p><p>After some thought about the problem, I was able to solve ALL of the issues with a simple cardboard box. The box is big enough to house the assembled Chonograph with about 12" in front of the unit. A vertical hole about 1 1/2" wide and 6" tall is cut in the front and rear panels of the box to allow for the line of sight and the bullet path to pass through the chrono at the correct height and alignment. Alignment was checked with a broom handle. </p><p> </p><p>The LED light kit I have is a constant light source that I power with my auto jump pack. When the top of the box is closed, only the LED illuminates the eye. The majority of the muzzle blast is deflected away from the chrono; very little passes through the front hole in the box. The result has been consistant and believable numbers because the chrono is shielded from those things that would upset it including varying daylight conditions. </p><p> </p><p>In the next day or two, I'll take a few pictures of what I did and how I use it and post them. Believe it or not, this whole thing is not as unwieldy a contraption as one might think. In fact, it is actually almost self contained. I store it, transport it and shoot through it without all the setup/breakdown each time. If there is a down side to it is that one must shoot from the prone position only ( if one is bothered by that) Where I shoot, this is not an issue.</p><p> </p><p>This setup had apparently solved my chronograph issues. Now when I see numbers that vary, I have been able to trace them to some other source. Now I just have to get out and shoot at longer ranges to solve for my drop tables - if I could only find the time.</p></blockquote><p></p>
[QUOTE="Wile E Coyote, post: 582453, member: 28381"] I have the same chrono and had similar issues; A Shooting Chrony Beta Master. I also have the LED light kit they sell. A few months ago I was working up a couple loads for my 7 mag and found I was getting bogus numbers. I had both a sunny afternoon and an overcast day with the same issues. Some shots in the string were [I]apparently[/I] good while one or two in a 10 shot string were obviously too low. I just discarded those numbers. The apparent good numbers were in the 3200 + fps range while the bad numbers were half that. As it turns out most those "good" numbers were NG also. They were actually about 3050 or so. To start, there is probably nothing wrong with the chrono. It's just giving you a number for each shot based on what it sees. To make a long story short, the Numbers that were too high were caused by the muzzle blast upsetting the timing. A portion of the blast apparently either gets to the first eye before the bullet does and/or the blast outruns the bullet to the second eye. either way, the reading is bogus. Secondly the low numbers were caused by one of two things. A) the bullet path was slightly to the side of the eye or B) one day, the shooter ajacent to me was shooting a muzzleloader and the smoke and pressure wave would start and stop the clock and record a number. After some thought about the problem, I was able to solve ALL of the issues with a simple cardboard box. The box is big enough to house the assembled Chonograph with about 12" in front of the unit. A vertical hole about 1 1/2" wide and 6" tall is cut in the front and rear panels of the box to allow for the line of sight and the bullet path to pass through the chrono at the correct height and alignment. Alignment was checked with a broom handle. The LED light kit I have is a constant light source that I power with my auto jump pack. When the top of the box is closed, only the LED illuminates the eye. The majority of the muzzle blast is deflected away from the chrono; very little passes through the front hole in the box. The result has been consistant and believable numbers because the chrono is shielded from those things that would upset it including varying daylight conditions. In the next day or two, I'll take a few pictures of what I did and how I use it and post them. Believe it or not, this whole thing is not as unwieldy a contraption as one might think. In fact, it is actually almost self contained. I store it, transport it and shoot through it without all the setup/breakdown each time. If there is a down side to it is that one must shoot from the prone position only ( if one is bothered by that) Where I shoot, this is not an issue. This setup had apparently solved my chronograph issues. Now when I see numbers that vary, I have been able to trace them to some other source. Now I just have to get out and shoot at longer ranges to solve for my drop tables - if I could only find the time. [/QUOTE]
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Baffling Reults, Please Help!
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