As you know, John, I'm thinking of doing exactly this with my 300S.
Although I DO like the dioptres, and they have been proven many thousands of times at top level competition, sometimes those dioptres really screw with my iffy eyes.
So, especially as we'll soon be trying ours at longer ranges, I think a scope is the order of the day. And the Running Boar version was a scoped beast, wasn't it?
I think a low mag scope, with the facility to focus clearly at short range will be the order of the day. The little old Simmons 1.5-5x20 would, no doubt, be superb. Or a nice 2-7x32AO with crystal clear optics. If I could justify at the moment, I'd be trying out a Gold Crown Air King in that spec. For the short term, however, I'm just going to stick a Hawke HD Sport 4x32AO on it which is just kicking about doing nothing at the moment and see how we go......