Al & Wynne,
I have experimented slightly with neck bushings, in that I used a 267 bushing initially for the Dasher and found it was seating a little to easily for my tastes. I then went back to a 266 bushing and that made it better, this was with a 2704 chamber. I just purchased a Benchsource Annealer and must say it certainly makes resizing the brass much easier. We will see how it affects the group size.