Ring height on an Encore can be a very tricky thing.
You need to give more information. What barrel contour do you have? Does it have open sights? Do you want to leave the open sights on the rifle? A shorter scope may set in behind the back sight, but a longer scope will hover over the top of your sight-therefore you will need a taller set of rings? Another problem with the Encore's is the back of the scope. You need to have enough room to cock the hammer. Do you have a hammer extension?
Sorry to inject all this crap-but if you do not know the answers to all these questions, then you will probably order the wrong rings(it's your money). I would order the mediums, with 40mm objective lenses. This will be a little high with Warne's(they are by nature a little taller), but they work well for me. Also you made the best choice by buying the Warne's. IMO they are the best. Tom.