If you really want to shoot to 1000, you'll want to look at the heavy, high-BC match-type bullets. When you are running numbers between bullets look at wind drift and retained velocity as your two most important factors. Ignore drop. I'd look hard at offerings from Berger and the Hornady 208 AMAX, myself, but there's a BUNCH of theoretically worthy .30-cal long range bullets.
You'll also find, I think, that you'll need to apply the ol' hairy eyeball throughout your loading processes and mission-critical rifle "stuff" (to definitely include your scope) to achieve routine 1000 yard "pie plate" accuracy. You probably know all this already so forgive me if you do.
Bummer about the knees, but it sounds like you are making lemonade from those lemons <grin>! Good luck!