If you look at USPSA/IPSC shooters, they use a lot of different powders for .45 ACP. Win 231/Hodgdon HP38 are always high on the list, with Win 244 (replacement for 231, redesigned for coated bullet use) gaining. The lastest issue of IPSC (formerly FRONT SIGHT), has a list of what all the shooters used, holsters, mag pouches, ammo, etc., etc., etc. The thing that interested me most was Dillon was by FAR the most popular press with up to 93% (Lee didn't even get a [dis]honorable mention) with LOADER7 (hope that is right) getting as much as 7%. Of course there are a BUNCH of different classes, but Dillon walked away with the most presses in each class, then LOADER 7 and Hornady, etc. Winchester primers were the most popular in all classes too and walked off with it. This is a change from the last few years when CCI and Federal were one and two, with Win in 3rd place. Federal has softer primer cups so some revolver shooters and light hammer/hammer spring shooters like them better.