I have 4 6 lug Mark V Talley lightweights on 1 Talley split rings and bases on one and Near Alphamounts on the others. I really like the Alphamount but there's a significant difference in price and it looks great on a Mark V action. I tried to post an image but its too big+ .
here's a link to Richards web site several images there.
http://www.nearmfg.com/Good luck and shoot straight y'all