Badger - thanks for that data - can use it to interpolate to other slugs/balls of similar weight- being careful to start a bit low, of course. There is some lee-way, though, if using built up wad colums, as they are less efficient than plastic gas checks.

I haven't use PB for years - used to for .4545 Colt loads - might evne have a pound of it around - good pressure/velocity ratios with it.