Has anyone thought of the issue that a Berger bullet and others... that shoot bad at 200 yards will actually stabilize better at longer distances and "settle in" to become more accurate at these longer distances. I have a 30 moa rail and 150 moa of vertical adjustment in my optic and have 105 moa of usable adjustment left once zeroed at 100 yards.... thats a lot of dialing! I don't us it all and a 300 yard zero is what I've changed to.. And also, in 4DOF and Strelok Pro you can verify and correct or validate your shooting as derived in the field with verifed dope added into the program. Another thing, in Strelok Pro make sure you have the "exact" scope picked. I made that error once with my Valdada Recon G2. I picked the wring reticle in mil when there wasn't an option for moa. I sent Igor, the creator of the app, the specs and reticle information for the moa version and he added it. Lastly, I don't know if this would affect thigs but make sure the turret in the scope picked is 1/8 or 1/4 moa clicks. I shoot a 338 LM and Strelok has always been spot on once Verified. I have listened experience with 4DOF. I don't know everything but... I've made those mistakes and tried to have learned from them. Ken.