I have the Leupold QRW rings on all of my prairie dog rifles and really like them. Point of impact does not change when you take the scope off and replace it. It also allows you to have 2 scopes on the same rifle if you want.
I have several sets of Warne QD but do have the Leupold QD on my 270 Model 70 and they work really well, i don't believe you could go wrong with the Leupold . I do believe the Warne QD are the best. /ubbthreads/images/graemlins/grin.gif
I have 8 sets of Leopold 30MM QDW rings on my AR's and use them to interchange high magnification target scopes for load development then to a hunting scope. They hold zero and work well. I hand lap them with a tool I got from Sinclair prior to mounting.