Assuming it still reads reliably, does the position of the FX chrono when mounted on the barrel/moderator (say between 0"- 5" back), have any discernible impact on accuracy relative to shooting with it off? With it on, is it better (from a harmonics/accuracy perspective; for those who know the importance of harmonics in real life - which is not me) to have the weight at the end of the barrel or at the farthest back position where it will still give reliable readings? Thx.
FX chrono position and barrel harmonics
- Thread starter SlowBoat
- Start date
I haven't used one , but I did see someone else comment in a post about poi change when they strapped it to the barrel. I'm guessing that strapping to the barrel changes the harmonics of the barrel. Someone else was testing a tuner wieght attached to barrel that could be rotated to fine tune the harmonics of the barrel.
Upvote 0
1) It will have an effect on accuracy. Whether it's discernable or not depends on things like barrel rigidity and how much vibration the gun produces.
2) How heavy of a weight and where that weight is placed is extremely rifle dependant. A lot of bench rest shooters experiment with various materials of various weights affixed to barrels in various ways in various positions. It has various effects on accuracy, sometimes astoundingly positive.
2) How heavy of a weight and where that weight is placed is extremely rifle dependant. A lot of bench rest shooters experiment with various materials of various weights affixed to barrels in various ways in various positions. It has various effects on accuracy, sometimes astoundingly positive.
Upvote 0
It has affected the POI on mine. especially with the 700mm barrel. but when I have the 500 mm barrel on it this past weekend with the 580 bottle, I mounted it on the bottle with no issue with getting a reading or a change in POI.
Allen
Allen
Upvote 0
Same here. It messes with my POI when hanging on the barrel.
I made this bottle mount and it works fantastic. I have the 3D printed bottle clamp sized so it just slides on and off the bottle. No wrenches needed.
I made this bottle mount and it works fantastic. I have the 3D printed bottle clamp sized so it just slides on and off the bottle. No wrenches needed.
Upvote 0
Just don't chrono and shoot for accuracy at the same time. Or find an off barrel mounting solution.
Upvote 0
Mine changed my POI when mounted on the barrel but I also got a couple of pretty good groups with it hanging just behind the moderator. I got a 1” wooded dowl and a picatinny scope ring and mounted it on the side of the gun and it works good there.
Upvote 0
Same here. It messes with my POI when hanging on the barrel.
I made this bottle mount and it works fantastic. I have the 3D printed bottle clamp sized so it just slides on and off the bottle. No wrenches needed.
Man that is ingenious it should be an option on the FX chrono way better then rubber bands.
Upvote 0
I do not own a FX chronograph. But personally I would not tune a gun for accuracy with a chrono hanging on a barrel. I know when I did remove a section of the modular huma moderator on my taipan, to make it shorter, the POI got higher, and the groups seemed to open up. So instead of trying to find a new speed where the gun grouped better, I reinstalled the section on the moderator, and dialed the spped back to previous setting.
So every kind of weight hanging on the barrel can change accuracy.
So every kind of weight hanging on the barrel can change accuracy.
Upvote 0
Shoot for groups and get velocity numbers. You don't have to have the chrony on the rifle at all. I have mine sitting in the grass when I am shooting in my yard. Have had zero issues with this method.
Upvote 0
If you do 100% bench shooting like i do, must you mount to the barrel or would tripod mounted below work?
Upvote 0
I place my fx chronograph on the table just under the barrel parallel to the barrel. But sometimes the chronograph moves so keep an eye on it.
Allen
Allen
Upvote 0