Chronograph reducing errors

[swampratt]

So I have an F1 Chrony and many times it will give an error.
When I first got it I had it set too close to the muzzle on a tripod.
I shot my 30-06 through the window and it rocked the thing back and almost fell over.
OK move it back. I now have it usually at 20 feet but have set it at 100 yards.

Too close and I have got odd readings like 3500fps from 168 gr .308.. yea that can't be correct.
Less errors farther out.

Other times it was partly cloudy or the sun was at the wrong angle.
I would get ERROR on the screen on a few shots
I removed the sun shades from above the chrony.
And just shoot between the sticks.
No more errors.
There was one guy that took a piece of plywood about 2 foot by 2 foot and painted it white.
Mounted the chrony upside down above the white plywood placing the plywood on the ground.
No more errors.

If your F1 is finicky or other chrony you may want to try some of the above.

 

[slas]

I have the same chrony and will get an error every once in a while but rarely any more. I made sun shades for the first one I bought since I got it used and the guy had lost them. Worked well but I went ahead and got another new one anyway. Then I shot it through the metal on the back end, bought another one. Decided to send in the shot one and they fixed it for about $25. Now I have three.....so if you need an extra......

 

[swampratt]

1 is plenty Thanks.
I have shot the steel wind screen rod.. just barely nicked it with .308.
At close range I have recorded shotgun velocity and it seems spot on.
Arrows read well also.

They say there are 2 kinds of people that own a shooting chronograph.
Those who have shot the chronograph.
And those that are going to shoot the chronograph.

 

[chazroh]

They say there are 2 kinds of people that own a shooting chronograph.
Those who have shot the chronograph.
And those that are going to shoot the chronograph.[/QUOTE]

Got to buy my buddy a new chrono this way! Got that t-shirt!!

 

[Jcann]

I shot two of the metal rods on the right side of mine. It was because of that, the time it took to set up, and the number of errors I decided to get a Magnetospeed. A shooting partner of mine just ordered a Lab Radar. I’m interested to see how it works.

 

[swampratt]

Last time I shot to record velocity I did not use the rods or the sun shades. just shot over the top down the middle and instant readout.

 

[Glocktogo]

They say there are 2 kinds of people that own a shooting chronograph.
Those who have shot the chronograph.
And those that are going to shoot the chronograph.
Got to buy my buddy a new chrono this way! Got that t-shirt!!

I think I've had 4 Chronos. Two Shooting Chronys, one CED and now a Pro Chronograph. I've never actually shot a chrono with a bullet, but I did ruin one with the plastic sabot off a muzzleloader bullet! LOL

In most cases, I just set the chrono on a range bench or barrel and shoot over it. I don't put the rods or screens on unless I get errors.

 

[chazroh]

The one I shot was on a bench and I was freehand shooting over it, I put a bullet trail down the top of it. Just didn’t feel right about giving it back to him that way!! Now I have a magnetospeed

 

[RedHawk357Mag]

I use a pro chronograph. It seems to do fine. I replaced the metal sunscreen struts with wooden dowel rods. If you tag a metal strut it will normally wreck a chronograph just like a round in the snot locker. In WAG rounds, for example 105 SWC or 200 grn RNFPs when your normal load is 158 grn, make a few extra rounds for confirming bullet impact differences before sending rounds through the screens.

Sent from my SM-T387V using Tapatalk

 

[Shadowrider]

I've been known to keep binder clamps with my Prochrono and clamp the white side of a USPSA target facing down. It helps a lot on sunny days in summer. If it's cloudy you don't need screens at all.