I don’t mean to be insulting, but this is planet Earth. Many of us here choose the simpler method which works far better quicker and is less prone to accumulating errors by a factor of at least 10.
We don’t miss by 3 inches, we miss by so many MILS. We tell the shooter to favor (X) mils and not work a mathematical equation worthy of an Oppenheimer or Einstein hypothesis. But hey, if proving the connection between relativity and Quantum Mechanics is your thing while trying to correct a miss, go for it. Let us know how it turns out. However, be quick, some of us only expect to live another 25 to 30 more years.
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Now getting to the subject at hand (sorta)
Hold left edge right? Or is it left? Being an old mortar man, I understand bracketing. I’ve used it many a day in handgun silhouette when bullets just weren’t landing where they were supposed to. Works great when zeroing on the NVA, not so much when trying to salvage a round. At least for me, but it got me on target, after wasting at least two of five shots allocated for that round. Spotting a miss and then using those funny little Christmas Tree lines inside my scope to make a correction works far better.