I have been using iBallistic and the like for a few years now. I have never had any issues with trajectory matching up to actual rounds on paper... at any range within 1K. When I work up loads, EVERYTHING gets shot over my Oehler 35P. The chrono has always been reliable and accurate. My question is this:
My 26" 8 twist WOA AR .223 will not match up. I zero my loads at 200, and then stretch it out. 400, 500ish were ALL at least 1.5 min high. I adjusted the bc of the 75 AMAX to .275 G7, and the MV to 2900, and the dope was DEAD on for 550 or 650 (whichever that was) and then hit within a couple of inches at 910. Had I done this with the proper .212 G7 and 2780 MV, It would have hit more than two feet high. How can this be happening? It does the same with the 77 SMK as well. The loads are good for less than 1/2 min.
I understand the output on ballistic calculators are only as good as the information on the input side, but for the past few years it has ALWAYS been damn near dead nuts right out of the box.
My 26" 8 twist WOA AR .223 will not match up. I zero my loads at 200, and then stretch it out. 400, 500ish were ALL at least 1.5 min high. I adjusted the bc of the 75 AMAX to .275 G7, and the MV to 2900, and the dope was DEAD on for 550 or 650 (whichever that was) and then hit within a couple of inches at 910. Had I done this with the proper .212 G7 and 2780 MV, It would have hit more than two feet high. How can this be happening? It does the same with the 77 SMK as well. The loads are good for less than 1/2 min.
I understand the output on ballistic calculators are only as good as the information on the input side, but for the past few years it has ALWAYS been damn near dead nuts right out of the box.
