In NZ in the 1970s, many 303s had a special small bridge screwed on which took parker hale rings. This is an authentic kiwi mod. Nowadays many of the PH rings have stripped their threads and the only currently available replacement is a CZ brand set with 19mm dovetail but the scope mounts higher than with the old PH.
303 ammo is hard to reload for, with relatively few projectile options. It's an enthusiasts project really. You are right to look for another working rifle to mount a scope on. Personally I'd go for a full sized round like the 270 3006 0r 308. If you can shoot the brass butt SMLE comfortably those will be fine.
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