Line of site 1.5" above center of rifle barrel?
I've noticed that in my computer ballistics program (Sierra), one of the data points asked for to predict bullet travel in relation to how your gun is set up is the height of the scope above the barrel, or line of site to center of barrel distance. (I'm probably butchering this description...sorry.) Changing this number by a couple of tenths of an inch seems to change the calculations of the computer program, sometimes what I would consider a significant amount. So, I wonder if the "standard 1.5 inches" often used might be causing practical discrepancies between computer program and data from the range/field. If the computer program is accurate in this respect, and because of it this measurement needs to be precise, my question is: How do you reliably, precisely measure this distance?
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