Re: 340 weatherby
A few years ago I bought a stainless 340 Wby barrel on e-bay. Not the accumark barrel it was just one off a stainless synthetic. I had a friend set it up in an action and bed it to a Wby wood lazermark stock. We put a Lupy scope on it with the BC reticle. It loved the factory 250 spirepoints shootin ragged holes at 100 yards. We found the BC reticle to be right on with this round. 200, 300, 450 and 500 yards. My son used this rifle for his first elk hunt and dumped a bull at 453 yards.
Velocities of 2900 fps are easy to get with 250 gr bullets and I have heard that this is a sweet spot for the factory 340 wby. I don't have any info on it with heavier bullets.
As for recoil, I would definatly get one with a brake. I have shot them without and got a pretty good case of scope rash. If you get a light rifle with out a brake, then I would definatly look into the eye relief of the scope you choose.