While deer hunting with my .45 and a prb I noticed a squirrel off to my right. He was sitting on a limb less than 40 yards away. I aimed at his head/neck area but the .440" ball hit an inch or two back. The thing literally exploded. I also shot another one that was a good bit farther away. Again the tiny target disappeared. I later went looking for the first one and didn't find all of him; but what I did find wasn't that identifiable. The second one was not in as bad shape but still not worthy of taking home.