Chrono

[Deerstalker]

https://www.caldwellshooting.com/ra...s/ballistic-precision-chronograph/720001.html
This is the chrono I have used for several years with excellent results. I don't connect the USB cable anymore & just note the FPS and pellet weight for each shot. These figures are then entered into this excel file that I use with the PC.

This data nay help some folks.

FPS = Feet Per Second, MPS = Meters Per Second, FPE = Foot Pounds of Energy.
To convert to Joules multiply FPE by 1.3558, Joules to FPE multiply by .7376
To convert MPS to FPS, MPS x 3.2808399 = FPS .
To convert FPS to MPS, FPS x .3048 = MPS.
FPE Formula is Pellet weight (gr) x FPS x FPS divided by 450240 or 450436.7.
450240 is 2 x velocity of gravity x 7000, (2 x 32.16 x 7000 = 450240) 450436.7 is 2 x velocity of gravity x 7000, (2 x 32.17405 x 7000 = 450436.7) The constant 450240 or 450436.7 depends on which value you use for the velocity of gravity, (acceleration due to gravity). 32.16 ft/s/s or 32.17405 ft/s/s. There are 7000 grains in one pound. The difference does not matter which ever constant is used for the FPE calculation.

 

[beerthief]

If that's complicated just wait till you spend an hour trying to get a traditional one setup and it still won't read half your shots. It's less complicated that linking a Bluetooth one to a device.

i use the cheap china one you just push one button and shoot a string . has never failed in the last 3 years .