Thanks Paul. It looks like you're bang on there. In the interim I've had a reply from Burris to the effect that if I insert the 10 thou inserts diagonally opposed to the front and rear rings it will give me the adjustment I'm after.
I have to say that Burris customer service seems to be top notch as I think I had a reply to my e-mail within about half an hour of the office opening.
Kind regards,
Tim
