Bigred,
So far I've tried Hornady 150's, Speer 200's and Sierra 220's. Finding that
H4831 is grouping the best so far, but I want to give some Ramshot Hunter a try as well. Only tried one other powder and that was H414 with the 200's, which it didn't like to much. Haven't shot it over a chrony yet, but I don't think you will be able to match the 2800 and change that Winchester is advertising for the 220's. More likely to get around 2750fps. From what I've read so far the 180's and 200's are getting their advertised velocities.