Plus one for Gary's, Dave's and Simon's suggestion ... Panorama with half mil dot.
Mine is nice and bright with a good picture and the fine half md ret is very useful.
I get the idea that the zooms give more options than the fixed mags and that the adjustable AO options gives even more flexibilty.
On the Hawkes that I've had I've had no confidence in moving the scope once I've set the zero. Moving the AO or even touching the adjustable eye bell to focus the ret has meant a move in zero.
My Panorama is fixed pa that is set to 25 yards.