Originally Posted by Ridgerunner665
Are you taking into account all the atmospheric data? What are you using to generate the drop data? A lot of little things add up to big things...
Scope height or muzzle velocity would be the first things I double checked...chrono's can be contrary gadgets at times.'
Could even be the load itself...if you used a powder that is prone to changes with temperature...
Ballistic ftp on ipod, jbm, and another. All come in the same. Chrono reading is basically the same as another rifle with the same load. Scope height changes make very little change in the drop on the programs.
The only thing that I can make sense of is a the zero range being wrong. To match the drops I would have to be off by 5" at 300 yrds. That just wasn't the case. Chrony reading was at 3340fps, would have to be wrong by nearly 200fps to match the drop. That could be it. But other rifles shot on the same day ran ballistics fine with the same chrony.
Not a big deal. Just frustrating.