While there is no substitute for a 'hard zero' i.e. go out and put theory to the test in the real world and see if the bullets really land where the 'puter says they should... I for one think it's nice to be able to know what to expect. Of course, when real world results don't match the computer printout... thats where the fun begins <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" />