A good friend and hunting partner just purchased a ZKK602 in 458 Win Mag. He's toying with the idea of opening it up to the Lott cartridge. The magazine is long enough as it comes but He's curious to know if anyone has done this, and what pitfalls may await him. Questions have been:

Who to have do the work?
Will there be more involved than just reaming the chamber deeper?
Are feed rails and ramp likely to need modicfication?
Any other comments?

Edit 2/3/08 - was going to delete this post because it is a duplicate of one on big bores but delete is not an option that I see. Sorry

its a 2 hour job, at the most... and darn easy