I have been using 572 in my 20 gauge and have been very satisfied. Old style WW compression formed hulls, Cheddite primers, Win AA white wads, 7/8 ounce. I can't recall the charge weight right now but it is the load right off the Hodgdon site that shows 1250 for the speed. Hulls that I had used previously with Unique that were very dirty, I swear seemed to getting cleaner once I made the switch to 572.
