Spot On like JBM Calculations is a "info in . . info out" type of deal.
The people that I have heard complain about either did not enter the right info. ESPECIALLY - - -> scope height above bore line,mv,and bullet B.D.C. for the longer shots.
My scopes nowadays are 80% Leupold. A few Nikon,one Sheppard,and several Zeiss Terra. BTW . . . the Leupold VX-R series are a great scope. I have two of them,both with the CDS feature. Super for low light. --- SAWMAN