I agree with Keith on using a reamer without Weatherby's standard freebore.
To me one of the most important details in "specing out a rifle" is the reamer. I'll never use a reamer that a gunsmith has unless I can verify the dimensions and they fit my needs.
I'd also consider using a 1 degree 30 min throat angle. Take the time to talk to Dave Kiff at Pacific Tool and Gauge. He made our 257 Roy reamer so it would shoot the Berger 115 VLDs. To date five rifles have been made and all shoot that bullet as well as others with excellent accuracy.
