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Weaver's applications chart shows the proper bases to be #95 (rear) & #94 (front).
The Weaver base(s) sighting channel, relieved in the center of the base(s) should allow sighting access to the open barrel sights.
It looks like the sighting channel on your bases could use some deepening (file/grind the channel down to the level of the installed screw heads & camo the grind with a black Sharpie)
The Weaver system will allow returning the scope fairly close to zero after R&R's - provided that the proper method of installing the scope is used (removing any forward/backward play).
Best practice indicates that in order to do so, before the scope in installed in the rings, the front ring is placed on the front base and held forward against the stop while tightening the ring attachment screw to that base.
Similarly, the rear ring should be biased towards the rear while tightening that ring's screw.
If your open sights are shooting too high @ 100yds, especially with the rer open sight adjusted all the way "down", your rifle needs a taller front sight blade in order to zero it.
If you measure the distance that the POI is above the POA @ 100yds, you can calculate the proper front sight height needed:
http://www.brownells.com/GunTech/Sight_ ... ?lid=13186
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