Winchester pioneered ball powders, I don't think they make an extruded or flake powder. (I)mproved (M)ilitary (P)owders was once owned by DuPont and made extruded powders for rifles. Hercules (Alliant) made lots of powders for shotguns in flake form and extruded powders for rifles. Norma was nearly all extruded powders, but they have bought up nearly every powder company in Europe so who knows what they make any more. Then there are the Finns with the company I can't spell, let alone pronounce, and I've not paid much attention to their powders. Hogdon started out selling surplus powders so they have some of everything. It seems like new powder companies are springing up every year and I haven't even seen any of the powders with names instead of numbers. I'd guess the best bet would be Wolfe Publishing, they have a different powder profiled every month in Handloader Magazine, and I'm sure they sell a compendium. Good luck.