I've still got a couple 8lb'ers of that exact IMR 8208 lot #AAC 122910. The term 'St Louis Pulldown' is likely because Ron Hoehn sold a bunch of it from his business at the St. Louis range. I bought a case of it from him when I was down there. A friend of mine and I both tried it in our 6 PPC's and it shot as well as I could tune.....though my experience is pretty limited with it. It didn't seem to be any 'dirtier' than anything else I tried....N133, H322, 2015, etc. Now that I've got a good 6PPC again, I'll revisit it.
Good shootin' -Al