I've used Unique and Bullseye in my 6.5-06 AI, but I gave up on it and just load cheap bullets and a max load of fast powder for the parent cartridge and shoot. My chamber is properly head spaced for the crush fit (I watched the gunsmith gauge it) but for some reason I got a few case separations with COW, go figure.
"Hunt while you're fireforming" would work with something like PDs, and would be a lot of fun. My FF loads were very accurate.
