Thread: What's the Deal?

Originally Posted by gimp

What zero range for the rifle? And what zero range entered in the app? Because I'm waiting for a plane in Singapore and have had 3 very large black coffees I have had a play with JBM.

With 2644fps and 100m actual rifle zero/100m zero entered in program the 500m elevation is 3.8mil, 650m is 5.9mil (ie the ~corrections that you required to hit)

With 2644fps and 100m actual rifle zero/200m zero entered in program the 500m elevation is 3.1mil, 650m is 5.2mil (ie the 500m ~correction that did not hit, we had no information supplied about misses at 650m)

2500fps is super slow for that powder/charge/bullet/case.

A theory: your rifle is zeroed at 100 meters but the program was set for a 200 meter zero. I can believe an easily overlooked data input error, they happen regularly.


Edit: I think I accidentally did all that with JBM set to G6 not G7 but that just kinda proves my point of how easy it is to miss one little input in a program, doubly so outdoors on a phone etc

Thanks for the help. Seems like some kind of input error then. Might ask Leathel what the zero range he entered was. Or maybe it is set for POI 1.5" at 100 for one of his rifles?

Zero is definitely 100m, angle of the shot was 5 degrees uphill for both shots. Correction was needed at 500m but not at 650m data was on. Shot was at a clay bank and splash was visible for corrections/misses. Final shot at 650m was a rock about .2 mil wide and 1 high. POI was at the left of the rock but elevation was spot on, wind would have pushed it I guess (light breeze from 5 o'clock).

I know Chronys can be off but I wouldn't have thought by that much.