i've got it sorted through chairgun now, for the 10 x 42 half mil scope the dots are as follows (with a 100yd zero) -

48.5yd (near as dammit 50yd), 100yd (centre of x-hair for both), 155yd, 195yd, 225yd, 250yd and 275yds.

brilliant combo with the HMR that i would say!!!