First things first.
Have you cleaned (really cleaned) the barrel? Completely down to bare metal, then an oil patch , then some fouling shots?
#2) How is the crown? A small burr can really make a difference, use a Q-tip and see if it hangs up at all when dragged out each land.
#3) How close to the lands are you seating your bullet? Some bullets I use need to be really close (like .003" from the lands) others need to be further (like .020") to shoot well.
#4) Cases, are all your cases the same? Same number of shots, same length, all been trimmed square etc.
Thats just a few things that are easy to check to start with.
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