What are you going to hunt with it?
I see you are in Missouri. If hunting corn field white-tails, a 139-140gr bullet will do you well. Likewise mule deer or prong horn antelope. These have a flatter trajectory to 400yds.
If hunting elk or moose, a 160-175 is your choice.
These are given we're talking about cup and core bullets.
I would use the Weatherby standard 139gr BtSpt load. It uses the excellent Hornady 139gr Interloks. I've not used them in the Weatherby, but have in my 7mm08, as well as the .257" 100 and 117gr BtSpt in my .257wby. (and MANY other calibers .24-.375).
I consider the Interloks as good as the Nosler Partitions.
For elk, either the 154gr or 162gr Hornady/Weatherby and 175gr Interloks for Moose.
Of course you can plug in others like the Nosler AccuBond, but price goes up dramatically. $2-3 a shot, just for the bullet. 7mm Weatherby factory loads can approach $4 a shot with such as the excellent Swift A-frames. Yep, $100/20!
My favorite bullet for my .300RemUltraMag is the lowly 180gr Remington Corlokts. They hold together at close range with good penetration, but also expand well "way out yonder" No, they aren't some sexy plastic tip uber bullet, they just "work" Likewise, the Hornady Interloks.
There's a reaso they were Roy's (Weatherby) choice for close to 50years in his factory ammo.