The crush fit in the Encore chamber creates inconsistent tension in the frame - I've chased this tail a fair bit. I ended up getting Mike Bellm's headspace indicator for my Encore and have my dies set to allow just under .001" headspace. Once I had the headspace correct, groups shrunk with each bottleneck barrel I have used. It's the minimum headspace without putting pressure/tension on the frame with the crush fit. Does that make sense?
