Started out in the 40's with a peep sited rifle and 3 shells, haven't progressed to the distance measuring thing yet.
P.S. I still have the three shells.
Was on a few of those hunt's in my younger days and would like to try it again some time but they think my hunting pardner is just to dangerous for those sheep areas now days.
I have a couple of sons that have hunted the African planes game and they tell me US hunters have some what of a problem as most of the African game have harts that are quite a bit lower in the cavity.