Check out Buffalo Bore and Corbon, both make some pretty stout loads for the 45 Long Colt. I do allot of hog hunting with a 7 1/2 inch Stainless Ruger Blackhawk covertable 45LC/45ACP, a unique pistol since Ruger never made a convertable in that model.
I use Buffalo Bore 260 grs at 1500 fps and Corbon 300 grs at 1300 fps. That particular load went through both shoulders of a 365 lb bore at 35 yards.
I am familiar with the specialty loads. Still, in general the .45 Colt is not in the same class as the .44 mag.
I hope to try my .44 on a hog one of these days.