It's best to start from zero for any zero gyro angle shot, O'Kane, Cromwell or vector analysis method. I like vector analysis myself but O'Kane is also very good. For a VA shot it's mandatory to zero the TDC.
Magic[/QUOTE]
I am not sure that I fully understand and if you could clarify one thing for me, that would be great..
Are you saying that I need to keep everything zeroed out using these methods?
Not entering AOB or Speed in the TDC? Just shooting straight at 000?
Thanks.