rh455,
A cheap shot would be to buy another gun. But the better approach might be to look thru various reloading manuals to find a preferred powder with your bullet weight of choice and go from there. I've personally never liked the Weatherby rifles, or their cartridges. But that in no way suggests they either cannot or don't provide great accuracy, and performance. Unfortunately, regardless of any praise I may give Weatherby, the issue remains, how do you obtain your accuracy expectations with your bullet of choice?
I'd recommend you look at all the manuals and powder mfrs recommendations and start there. At least you'd be on the same page of those who have figured out how to make these guns shoot. As an aside,
most folks who own Weatherby rifles have figured out the "magic" recipe.
So you should either be able to do the same or obtain assistance from another who has. I wish you good luck and good shooting.