I used the standard two piece Leupolds on my Mod 70 Featherweight 300 WSM. They worked fine, but the rear base needed to be reversed so the bolt could cycle without binding, due to the shorter receiver ring.

It slightly reduced the ring spacing but I only had a 2-7x33 Leupold fitted so that was not a problem either. No problems with ejecting empty cases do to the overhanging base at the rear of the action.