In general, I haven't gotten the same sort of accuracy from Weatherby rounds with longer, high-BC boat-tailed bullets as in shorter-throated cartridges such as the 6.5 CM--or the 7mm SAUM. This may (or may not) be due to gas "blow-by" in the longer Weatherby throats, especially when more tapered.

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck