The heaviest bullet I have loaded in a .45 colt is a 357 grain lead WFN. According to load data it was traveling at around 1100 fps. Recoil was not bad in my opinion. I have fired it in a Ruger Redhawk and Blackhawk and carry it when hiking in Black Bear and Mountain Lion country. Just curious as to what others load in their .45 colt when in large predator country.