Well, bullets are easy - you make them yourself. For load data use the Lyman cast bullet handbook, or the RCBS book. I have shot a huge number of cast bullets through my .243 with very good results. I use the RCBS 95gr mould, and usually load them over Red Dot or Green Dot to about 1700 fps. Easily holds MOA out to 200M, and is very pleasant to shoot. The only problem with shooting 6mm cast bullets anymore is the Hornady has stopped making 6mm gaschecks. That means that until somebody else starts making them, the supply is limited and they're going to get very scarce. And I don't know of a 6mm plainbase mould available, though you might get one from NEI. With this small bore you'll be extremely limited in performance with a non gaschecked bullet, but it should be possible to make it work if you're patient.
