Ballistic AE - question on max PBR

[glock24]

I'm helping a fudd with a 7mmRM and a duplex reticle establish a max point-blank-range (PBR) with a 6" vital radius.

In Ballistic AE, the max PBR is calculated in the bottom right-hand corner of my trajectory information (329 yards in this example). What i don't seem to have listed is the recommended zero offset to establish this max PBR. It would seem I have to plug-and-chug, meaning that I have to keep entering different zero ranges until my bullet falls below a 6" drop at around the same distance as the calculated PBR in the right-hand corner.

Other programs offer a calculated zero offset from my established zero (e.g. 2.5" high at 100 yards) which corresponds to the calculated max PBR

What am I missing?

Thank you

 

[pell1203]

Glock24, here is what I think you need to do to get your answer.

Run your calculations using your regular zero (i.e. 100 yards) and vital zone radius (6"). Once the table is displayed, note the first line (0 yard) is red and that a line somewhere downrange is also displayed red. The distance and bullet drop associated with that red line will be the limit of your PBR with a 100 yard zero.

Next, go back to the Trajectory screen and enter the PBR range shown in the bottom right corner as your new Zero range (329 yards) in your case. Recalculate the table using this new data. Note on the table that using a zero of 329 yards has now caused the second red line to be displayed at a distance past 329 yards which corresponds to a bullet drop of 6" beyond your 329 yard zero range. Your rifle is now sighted to theoretically shoot inside a 6" circle at distances from the muzzle to where the second red line on the table is displayed.

On this same table with a 329 yard zero, check how far above the 100 yard line your bullet flight is predicted to be. This will be the offset elevation value you are seeking for how far you need to shift your zero.

Hope me this helps you out. Typing this out on the phone is no fun!

 

[glock24]

You sir, are a genius. That solution works so eloquently I can't understand why it isn't spelled out more clearly by the author. Thank you

(I actually reached out to the author and received the dumbest answer to my question ever. You SH guys should be charging a commission for this info)

Thanks again