I just bought one of these and put it on my M700 in .308. I haven't been to the range yet nor have I had a chance to read anything provided. I also have one on my M70 in .270 without BDC that I have had for 5 years. I have it sighted in at 1.5" high at 100 yards for Remington 130gr Corelokts. It is dead on at 200 yds and about 2-3" low at 300yds. It has not lost zero and has taken several hogs.