Wow, with that bullet and sabot assortment you guys have a full day ahead of you. I'm with you as far as starting loads go. I'dstick with one bullet and start at 80 grains and work your way up to 110 grains or so with three (preferably 5) shot groups. Then do the same with another bullet. I'm sure you know the importance of keeping notes on each load, or keeping the targets with all of the load info marked on them.

As far as the 320 REALs, I'd start at 70 grains and stop at 100.