SOLVED: Foretrex 701: AB Range Card Issue

[Symplex]

Hello; been lurking for some time.

Just looking to see if anyone else owns a 701 and has had issues with incorrect data for Energy and Drop (in/cm) in the Range Card. I'm seeing errors in expected values, while Velocity and Elevation/Windage MIL and MOA values all look correct.

Thanks.

 

[_Windrider_]

Give me an example of what you are seeing bs what you think you should be seeing. My guess is you are misinterpreting what that drop in inches actually is.

 

[Symplex]

I hope that's all it is, maybe I missed a setting somewhere; I'll use an example that I've actually shot:
(note: embedded images for formatting purposes; I missed the table option)

Next is an Example that I haven't confirmed at distance but illustrates the issue:

In short, Comeup and Windage MOA and MIL values seem to be good, but drop and energy value readouts in the range card, to my knowledge, simply can't work in the equations.

Ex, using above values:
4.6 MIL = 46cm @ 100m; therefore 4.6 MIL = 276cm @ 600m (~278.9cm)
4.40 MIL = 44cm @ 100m; therefore 4.4 MIL = 264cm @ 600m (263.8cm)
4.45 MIL = 44.5 cm @ 100m; therefore 4.45 MIL = 267cm @ 600m (351.2cm?)

or, (using shooterscalculator and ballistics101)

130gr @ 1676 fps = 811 ft. lbs. (811.3)
130gr @ 1695 fps = 829 ft. lbs (829)
130gr @ 1974 fps = 809 ft. lbs (596.73?)

Spin Drift, Coriolis, and Aerodynamic Jump are Disabled, MV-Temp and DSF tables are Cleared, and all calculations were run using International Standard Atmosphere values. Unit is running Firmware V4.10.

I'm curious if this is a bug of this specific unit, or a "feature" of the line. Elevation and Windage MIL/MOA values look good, but the drop/energy output errors don't exactly inspire confidence in the unit's accuracy, especially once error/tolerance stacking is factored in and distance increases.

Thanks again.

 

[_Windrider_]

Drop is the total drop the bullet experiences not just the drop below sight line. Think total drop from max ord.

find the max ord and factor that in and I bet it looks more like what you think it should be.

 

[Symplex]

I'll look in to it, thanks!

Edit:

Thanks for the help, factoring in max ord got the numbers closer to what I was expecting. I also found this diagram on kestrelballistics, referencing the 5700 w/ AB; something like this?

 

[_Windrider_]

I'll look in to it, thanks!

Edit:

Thanks for the help, factoring in max ord got the numbers closer to what I was expecting. I also found this diagram on kestrelballistics, referencing the 5700 w/ AB; something like this?

View attachment 8110441

Exactly

 

[Symplex]

Thanks again; marking as solved.