Pick the gun up, mount it 2-or3 times with your eyes shut, then when your happy on the final mount, cheek well placed on the stock etc, open your eyes and you should see the end bead and almost a runway vision of the top rib. If you are looking at the top lever the comb is to low.
I know of a number of people who have been fitted for guns by various gun shops and they have been a mile out. A good friend went to Avalon guns and they sold him a gun that fitted "like a glove", yet at 20 yard he constantly missed a stationary a4 sheet, above and to the left. so don't take anyones word for it.
Hope this is of some help.
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Thanks fella - practised mounting many times but never with my eyes closed. Will try that.