I have seen them anywhere in the range of perfect yo pure garbage. The answer to your question is "maybe".Do they normally need trued up?
I had a 340 WBY mag MKV that the action was machined so far off centerline that I could not zero scope without using adjustable windage bases. At first thought just drilled crooked, for bases, but centerline of action was actually off. Sold it for $475, complete rifle.(buyer was informed)Specific to the Mk V can you define "pure garbage"??
And, how did the "pure garbage" rifle(s) shoot????
Remember Weatherby is not making and selling match rifles, they are selling hunting rifles, and, unless they give you a written guarantee then the accuracy you should expect is "minute of" deer/elk/caribou/moose, or what ever other big game you're hunting. If it doesn't shoot that well, you have a valid gripe. If it does, or even shoots better than that, you don't.