My loads are with H110/W296. The magnum powders are pretty bulky compared to others.
On another note I just received an 8# jug of alliant power pistol mp-300. I'll be busting out the chono and 327 Blackhawk in a few days. The only bullets I have are 100gr XTP, 100gr Speer GD, and 115gr Speer GD. I'll baseline my Blackhawk w/ 100gr AE.