1st chronograph

308Loader, 0 degrees is COLD !! While I think in theory a light sensing Chrony will still function, i'm thinking those brutally cold temps will cause weaker voltage from the 9v battery and possibly cause inconsistences. I guess all you can do is try and see what happens. Here's a trick I learned to ensure good bullet path alignment when setting up your Chrony. I first look through my scope and get a good fixed target picture, then I use my optic bore sight laser inserted in my barrel. I then take a sheet of 8x11 printer paper and place it vertically behind the rear sensors vertically and verify the red dot from the bore laser is exactly in the middle of the sensor path. A few extra steps, but if you do this you will never damage your Chrony from a stray shot. I also added a bungee "S" hook underneath my Chrony tripod and if i'm in windy conditions I hang a 8# block of lead to add stability. If you rush to set up your Chrony, you WILL shoot it. I learned years ago, be patient, measure carefully and you will be good to go. Chrono data is excellent info especially for long distance doping of your precision loads. I have over 700 documented velocities test sessions and my FPS data trends have taught me a lot. Lastly, don't get all wound up if you experience high ES's. I have learned that wide ES's have no consistient correlation to poor accuracy. For example, I for some reason see ES's over 50 when loading 4064, yet I commonly observe single moa accuracy even with the high ES. Contrary to this claim I also observe ES's under 15 and have horrible 3+ moa accuracy.
 
Scoped rifle shoots 1.5 to 2" lower than the scope. That is an easy way to shoot your crony. I shot my truck that way too.

David
 
I feel your pain David.

I watched a police 'Sniper' put three rounds into a brick wall on a training ground, wall about 15 feet in front of him... Couldn't figure out why he wasn't hitting g the target.

Another guy shot the far side of a pickup truck bed, 4' away, TWICE before he figured out what was happening...

I've not shot the crony directly, but I've taken the uprights off a couple of times, seems when you reload and bring the pistol back up the uprights move when you aren't looking! :eek:
 
2 words of advice..
1) fresh batteries!! Weak ones will give you errors.
2) distance.. Found with my 7mm-08 that 10 feet too close. Had to move to 15 feet.
 
fresh batteries!! Weak ones will give you errors.
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This is how/why I shot my first chronograph. I didn't experience the reading errors part (per se'); but what I did experience that I needed to keep shooting lower and lower - closer and closer to the pick-ups in order to get a reading (shooting 38 target loads at the time). I knew I was getting close, but continued chronographing - until I got one a little too close.


Scoped rifle shoots 1.5 to 2" lower than the scope. That is an easy way to shoot your crony.
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It's called "parallax effect." And this is how/why I shot my second chronograph (with a scoped AR15). I was aware of parallax effect; and knew my target downrange was awfully low relative to the chrono, but decided to chance it anyway. First shot: Through and through. It was a beautiful shot. Expensive; but beautiful.

From a root cause standpoint, it wasn't low batteries and parallax effect that caused me to shoot my chronographs. The root cause was laziness. I was too lazy to wait 'till the next cease-fire period to go out and put a new battery in the chrono (I keep one on hand for just such an event); and move the target, respectively. But in both cases, I didn't feel like waiting. Laziness - $200 worth.
 
"Beautiful Shot"...
That's exactly what I said when my wife shot the crony!
About 1/2" under the metal hood/sun shade for the display, dead center, through & through.
Couldn't have been more centered or precise, in and out on the same plane.

She was HORRIFIED and sure I'd be mad, took her by total surprise I was laughing...
Crap happens, and if that's the worst accident she has with firearms I'm a happy clam!
Didn't much care for that crono anyway, big sheet metal monstrosity I won on a raffle that ate batteries faster than a 10 year old eats M&Ms.

Just for grins, I mounted it on wood, stuck some antlers on it and hung it on the garage wall, still there to this day.
 
easiest way to position a chronograph for rifle use is to use a laser boresight. Sit the rifle in the rest with the scope on target with the bore sight in place. take a piece of cardboard place in front of muzzle then walk it out to 10 - 15 feet and place your chrono using the cardboard between the uprights on the diffusers to adjust height, angle etc.

If you can't do that then pull the bolt and look down the bore or adjust the scope to the lowest power so know you are shooting through the diffusers uprights. I never have and doubt I ever will shoot my chrony because I take my time setting it up.
 
I left the crony on the tripod, folded the legs up, sat to behind the big old wagon (truck), then dropped the tailgate to load the target stands, gun cases, ect...
Needed to back up so another guy could do the same, and CRUNCH!

Tail gate still down, crony under a rear wheel, good thing it was one of the $80 specials and the tripod was from a discount store & not my shooting tripod!

Anyone that says they have NEVER had an accident is either lying or lying...
Just be happy when basic safety rules keep people from getting hurt!
 
If you shoot a chrony, they will replace it at a reduced cost. Ask me how I know......
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They call them "ShootingChrony" for a reason ..... :D

Use on bright overcast day, makes sense due to what I would assume to be an infrared sensor.
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It's photo-electric. The sensors see the change in light and measure the elapsed time between the two sensors .... distance is constant, so .... Math..... Blue sky days work, too ..... the opaque sky screens are required sometimes, sometimes not.

Don't shoot it! This one has me a little worried. Reading through the post and others I've read on the topic cause of death is overwhelmingly reported to be lead poisoning (shooting it). I saw one response about putting a wood block in front of it seems smart, not convenient, but smart. I would assume a 6x6 block of hardwood lengthwise? some of what I have read on this type of chronograph suggests that the sensor will only read in a narrow band just above the sensor, not the whole width and height of the sunshade? any advise on safe setup? I would assume with a bolt gun I could look down the bore and guestimate the proper alignment. With a auto loading rifle would I zero at a close range? say 25-50yrds to keep the bullet path aligned? With a pistol shoot at a bench with a rest and cut out the coffee for the day to avoid a pushing flinch?
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A sandbag would be better, I think. And using some woods that are prone to splitting lengthwise might make that a bad idea... I use a camera tri-pod for mine ...... but wish I had a folding table or sawhorse instead .... just for the sandbag idea .....

The best way to avoid shooting the thing is to have a target set up behind it and shoot from a bench with sandbags and/or a rest .......
 
Anyone that says they have NEVER had an accident is either lying or lying...
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You ever think maybe they just know where the bullet is headed when they pull the trigger ? Or maybe they tend to remember the bullet is still about 1.5 inches below the aim point when it is ten feet out. I am not the worlds greatest shot and neither am I a liar. I am just careful with my tools

As far as running over them, well stuff happens. Mine was tipped over one day on concrete while I was loading up to go home. A kid backed into it while talking to his Dad and looking at his target. The chrono had a rattle the kid apologized and Dad offered to pay but I declined. The Magnetospeed was just hitting the market and I was looking for a excuse to upgrade. When I got home I opened it up and found a wiring clip loose. Still works fine and I have still never upgraded to the Magnetospeed
 
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