WEBFeb 8, 2013 · The Winchester engineers went back to the .45-60 WCF and squeezed it down to take a 210-grain, .40-caliber bullet over only 60 grains of powder. The .40-60 WCF has to hold a record for being the weakest cartridge chambered in the heaviest rifle.” Perhaps so for hunting but still one of my favorites for target shooting.