If you want detachable "quick release" mounts, I have used the Leupold QR series and they return to zero very well. Not for the benchrest paper punchers perhaps, but they work for me and I can have two scopes set up for one gun and switch them. I have a 1.75-6 and a 3.5-10 for the gun and it's amazing how good the POI is when switching back and forth. I can take the scope off the gun for transport and cleaning, and I like that alot. The two scopes also mean I have a backup if some misfortune happens to one...
I can't say about other brands as I haven't used them.
I would think there might be a law against ugly add ons to a Model 70, so be careful about that...
