I believe the Weatherby has a 1-12 twist rate, so the Heavy bullets are hard to stablize. Can always see what will happen though, some rifles shoot a certain bullet better than others xD. One of the best bullets you can get is a 155 scenar, if you can find them anyway
. I have rather good luck running 150 SST's in my PTR and Cetme, which I'll happily use for hunting. Those two only get 150 gr. bullets loaded close to mil-spec loading. The Remington seems to like the 168 gr. Bergers or A-max.
Regards,
Jung