I got my Old E a couple of days ago and shot some fffg yesterday in my .40 cal flintlock. Didn't have much time, but after about 25 or 30 shots, my initial impression is that it seems to be comparable in power to regular Goex but with quite a bit less fouling. Shooting offhand at 100, so my accuracy results are mostly guessing, but I never detected anything offkey. All my shots seemed to be right where the sights were pointed in other words. No elevation difference between Old E and regular Goex shooting 60gr of each. The Old E actually "sounded" a little softer, but that could be some kind of difference in ignition characteristics or who knows what. Significant but meaningless is where that info goes. I'll get around to shooting some in the Sharps cartridge gun soon. I've got some 1.5f too. First impression: I like it but I'm not sure I want to spend $5 more dollars a pound for shooting in my roundball guns.