IMR PB powder was the ticket for me. Had all sorts of problems coming up with reloads that were in the 5-6 thousand range and then I found that a lot of recipes on the Parker site used PB. After a few tries I had a nice load for 2 1/2" hulls I got at Graf's. Tom Armbrust verified my load at 5,600 psi at 1,125 fps.