When I built my first PPC, the one thing I really liked about it and subsequent ppc's was it's ability to shoot well with a wide variety of powders. In fact, it was almost too tolerant and it was hard to make a choice. I used and won matches with 322, 4895 (both IMR and Hogdons), 3031, 748, and Re7. Today, I would try Benchmark and 2015 as well. Don't get sucked into a rut. The same thing goes for primers. It sometimes pays not to play follow the leader. Regards, Bill