Jake, I have shot the Ultra Slugger in 12 gauge and although it is accurate it is also a lot heavier than I care to tote around.  In my hands it feels like it has all the finesse and balance of a pickup truck drive shaft.  I would note though that a nephew has had one for years and loves it.
I had two Savage 210F slug rifles and jumped om one of the first 220s when they first came out.  It is 3/4 pound lighter than the 210F (12 gauge) and kicks a lot less.  I have been using the Federal/Barnes 5/8 ounce tipped Expander and they shoot into right at 1" at 100 yards all day long.  That load (P209XT1) has been discontinued and the new replacement has a copper slug with a lower BC (P209TC).  I haven't tried them yet since I still have some of the older style on hand.
With the old slug the rifle would hold about 2-1/2" groups at 200 yards off the bench.  I hope the newer load does as well.
 I would love to have a savage. But, they cost alot.  
Encores are not at all my field of expertise but from what I see slug barrels are pushing $400 (I could just not be using the best search phrases) and a Savage 220 can be had for $440.
For having the Accutrigger, three rounds if needed and the handling of a good bolt action rifle I would buy the Savage again tomorrow.
Lance