Mine is consistently 5 yrds off, when compared to 2 LRF binos (Sig 3K and Sig 6K)....this tested on ranging skylined power pole transformers from 250-1200yrds. (I also tested this at a recent ELR match I MD'd, out to 1760y. WMLRF read 1765, while others read 1760.)
Not really a big deal, IMO, as the range is just a number. Meaning, if I cal my MV with this LRF, it is calibrated to this gun. Regardless if it's 1200 or 1205, as long as I cal my MV to the range I hit with the WMLRF, that's all that matters.