Rolling your own is definitely the way to go.
But...since you don't,
I shoot 4 Weatherby rifles regularly. All belong to my father in law and not me, but I do shoot and load for them often.
In all 4, .30-378, 7mm, .340 and .460, the Weatherby ammo shoots far better than any other we have tried.
In the case of the .30-378 and .340, we can't match it's accuracy with handloads.
I can't recall how far off the listed velocity was from actual, but I don't remember it being overly exaggerated.
If price isn't a huge issue, and hand loading is out the question, I don't see how you'd go wrong with Weatherby's ammo.
