Leupold MK4 HAMR BDC...how is it for M193?

[jrsteensen]

Interested in picking up a MK4 HAMR, but curious if the BDC would be accurate for M193 ammo? I have quite a bit, and short on M855.

[TehLlama]

You'd have to be shooting it past 250yd for the standard deviation cone of the ammunition accuracy could even let you statistically notice if the POI was deflected downward, assuming a CL barrel and a 1MOA shooter with amazing consistency, firing lots of rounds. It'll work fine, and if you're running it past 300m anyway the barrel/ammunition grouping coupled with wind are STILL going to be significantly larger sources of error, and this is assuming best case of known distance targets. For UKD - the BDC error is literally negligible, so just drive on and ignore ammunition.