On Encores I always look for a scope with an eyepiece housing that is as small as possible (Leupolds tend to be good in this respect) because it may allow you to get away with lower rings. The exposed hammer sometimes contacts the housing if it is too low or too large...the bigger the eyepiece, the higher the rings need to be.
Alternately, you might find that many scopes advertised as shotgun or muzzleloader scopes have extra-long eye relief, and you can mount them far enough forward that the eyepiece is in front of the hammer. I have a longish neck, so this works well for me with some scopes...one of my shooting buddies (shorter guy) can never get this to work for him.
Another thing worth keeping in mind is offset hammer extensions. If you use one of these to make cocking easier with a scope mounted, make sure that you get one made of aluminum. Steel ones weigh enough that they sometimes cause inconsistent ignition, and can apparently even bend or break hammer spurs. I had this ignition problem with an Encore slug barrel, and it drove me nuts until I changed the hammer spur...problem solved.
John
