I’m shooting a Weatherby Vanguard in 6.5 creedmoor with a Swarovski Z5 3.5-18x44 with a brx reticle. This rifle is for my 12 year old so I’m setting it up for MPBR at the moment with the expectation he won’t shoot at an animal past 200 yards. As he develops as shooter I want to teach him to use the reticle. I will of course use it some too. I got it to shoot 3.5” high at 100 hoping to get myself to a MPBR setup that will allow him to hold on shoulder or hot gongs from 0-300 yards. That puts my zero, per the app, at 286 yards and at 300 I would be -1.13 inches. I plugged the load, rifle, and scope data into the Swarovski ballicstic app and into iStrelok’s app. Both apps show very similar results for drops. Interestingly I could hit the 6” gong 200 yard target routinely but had no consistency with the 8” gong at 300 yards. I will put a white board behind the gong this weekend to better view where I’m missing. I know I’m low but not how low. Interesting that the ballistic apps would be that off so it has to be me or maybe bad data that I’m not seeing. These are gongs I routinely hit with other rifles, loads, scopes, etc. so I know I’m capable of hitting them. The three rounds that did hit the 8” gong were at the very bottom of the gong. Like anything what the apps say is only a starting point. You need to shoot and shoot often to really know what the gun will do. any advice on what to look for in data that could be wrong or to better tune this new setup?