Sight settings

[derskeeter]

First timer here so please be gentle.
A buddy and I are going to try a 600 yard match and would like sight settings to start with. We both have settings for 500 meters.
My load will be a 535 gn money bullet at 1300 fps.
His will be a 435 gn money at 1200 fps.
Any help would be greatly appreciated.
Anybody have a clue as to the BC of these bullets? My ballistic calculator starts smoking when I try to figure it out.
Thank you.