Yeah it may have to do with the coat but ive seen this on game with the mags as well. Good to find out now rather than on a bear or foul tempered cattle! I saw this happen with my cape buff. The ph took a running shot on my buff and the jacket penetrated 4" into the gut and the only lead we found was in the paunch and a smeared piece of 144 grs at that, from a 454 lott. He said he shot cuz he didnt trust the 454 to kill it. (Not bobby hansen the main ph btw). Funny he was shocked to learn the one shot with the aframe put the animal down and the pistol was the only thing killing that day. This is why i preach barnes and a frames, i guess partitions are ok to but not as good imho. I now only use xtps for deer.