Brad,
I had a similar experience with a 308 barrel that is detailed in a recent thread. I did a lot of things in an attempt to improve accuracy including trying different scopes, free floating the forearm, recrowning, trigger job, different ammo, etc. I cannot say which of these potential fixes had the most effect, however after several trips to the range and five boxes of ammo later, I was able to gets some good groups out of the barrel. In reflection, the most effective thing that I may have done was to get 60 to 100 rounds through the barrel and get it broken in. This particular barrel appeared to have an extremely rough bore and may just needed to get some rounds through it to smooth it out a little. Usually, I would not have tried this hard and would have sold or traded earlier in the process. But it was my first experience with an encore and I really wanted to get the bugs out and be able to move on with confidence to other barrels before scrapping the whole encore system. Plus I just enjoy tinkering with things.
I now have several other encore barrels that I am pleased with. Just have some patience and maybe she will continue to perform.