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Originally Posted by stanley_white
Roger. Thank you.
Does anyone have the figures for a 10.5" barrel M4 handy?
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Stan,
There is a lot of variation in muzzle velocity between commercially available loads when the barrel gets that short, so you will need to chrono whatever you're shooting and then use a good ballistics calculator to estimate drop. IIRC, the difference between Hornady's 69 gr. TAP loads is about 200 fps for SAAMI spec vs. NATO spec, for example. Or, if you're just shooting M855, you could search barf.com and someone might already have posted the answer. Or, you could get to a good KD range like Gene said and let us know how the lollipop technique works for you. 
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