Is your barrel counter bored? If not, try recrowning it. Also make sure the screws holding the action to the stock are tight. I have rifles that slug out to .313 and shoot 2-3 inches using .312 Hornady soft points.
Check this site, they will have what you need. I have ordered from them before, they send what is advertised, good people to work with.
http://www.e-gunparts.com/product.asp?chrProductSKU=297040