Overbore cartridges like the .240 Weatherby and .257 Weatherby just don't make much sense to me.
They don't make much sense if you are hunting in the thick rainforests of Oregon, but they shine on the prairie or in an elevated shooting house looking across a beanfield or sendero.
I have no experience with the .240 but know a few people that love them for Pronghorn.
I own an HS Precision Pro2000 in .257 Wby that has accounted for a dozen antelope, 3 trophy mule deer and a fat cow elk. I also scored my longest kill on a trophy whitetail...387 yards Dead right there.
Paying $150 for a Mark V, even 30 years ago is a great story.