The 45 ISN'T for bc's sake, it's because there were too many complaints of splashing with the other bullets, on coyotes and stuff heavier than PDs and ground squirrels. It was designed not to splash on coyote hides, or so Hornady says. My Savage tube shoots them fairly well, 3/4" or so, the CZ will only do about 1 1/8". They shoot fairly well in most 12 twist rifles, they are shorter than the 39s and 40s.