Ammo tried? Groups you've shot and at what distance? Technique?
Don't forget that Weatherby will make good on their accuracy guarantee and before you throw money at it don't be afraid to call them and see what they'd like to do.
If you've called them already, tried almost every weight of Wby factory ammo and no one can get it to group better than the 1.5 inches at 100 yards... then there are a number of options. This would include anything from a simple restock with a Bell & Carlson or McMillan, a rebarreling, or a complete redo. Having seen a couple of rifles perform after their work take a look at Hill Country Rifles if you want a restock, bedding and accuracy guarantee. My Wby Ultralight in 257 Wby was redone by them when owned by the previous owner, and it's a tackdriver!
So, a bit more information would be helpful.
My Lazermark is just to look at. My other Weatherbys are for shooting.