Originally Posted by
lensman57
How accurate it is depends on how accurate the value of the BC is that is allocated to pellets. I find the values in the library a bit over optimistic for long range shooting. For example a JSB exact 8.44 has a qouted BC of 0.022 but I find that in my S400 this value is more like 0.019 . The good news is that if you restrict your shooting to 45 yards the error is small . You also need to give an accurate scope height otherwise all bets for short range precision are off. Once correct values are used the results are very close to reality.
A.G