I got one of the limbsavers from Cabelas for my .308. It pretty much fixed all comfort issues. Also, the encore walnut stock is about 1/2 longer than the black composite... so the extra half inch made it more like that.
I got a small... it fits but it's a little small. I think the medium would also fit, but it would be a little on the big side. The encore stock seems right in the middle of the two sizes.