Mount your scope as low as possible and as far back (towards you) as possible while maintaining your proper eye relief. Remember that the Omega with the BDC was sighted in and designed with a specific load of Three (3) 50 grain pellets and a 240gr TCSW bullet. Ideally, when you shoulder your weapon, it should be there without alot of head movement to get your sight picture thru the scope. Good Luck