Originally Posted by .280fan
That's less than 1/2" of "error" at 1k.
Does that much "error" really matter?
Yes it does, actually.
Take that 1/2 of error, and take it times however many moa it takes your cartridge of choice to get from 100 to 1000yds.
For sake of example, and easy math, consider a .308 Winchester running a 155 (not exactly a LRH combination but one I know off the top of my head ;) ) - roughly 30 moa to 1k. 30 * .5 = 15", or about 1.5 moa off. Think you'd notice that much?
For the original poster... while you do need to figure out at some point whether you have IPHY or MOA adjustment (by running a box test, not by what the scope says on it), for your original question about the 'in between' values - its called 'interpolation'. The math for how much a quarter (inch, moa) represents is fairly simple - most people are generally able to remember 1/4 = .25, 1/2 = .5, 3/4 = .75. Eighths are only slightly more complicated - 0.125 each. So if your come-up is '6.8', round it down to 6.75, turn your scope to '6-3/4' (quarter moa clicks) or '6-6/8' (eighth minute clicks). With practice it becomes very much second nature. The one thing I do *not* recommend doing is changing your ballistic program input to '1/8 minute clicks' as mentioned earlier - then it will spit out something stupid like '54.4 clicks' (6.8 * 8), and then you're back to counting clicks which defeats the whole purpose of having micrometer scales on your scope turret IMHO. I can do 'mental gymnastics' converting (basic) fractions in the blink of an eye, but once you lose count when counting clicks... you generally get to start all over (yuk!)