First of all I am pretty sure that the back sight on your Encore will fold down. Mine did. I would go with the Warne base-rather than the Leupold. I believe it is longer and will allow more room to move your scope forward and back. You may be able to move your scope back far enough to clear your back sight. You can use the Warne or Leupold rings on the Warne base. The Weaver base also works well, IMO it is not quite as strong as the steel Warne, but it is still pretty long. Tom.