So last week I shot a mule deer with my 270 wsm, 140 Accubond leaving the barrel at 3100 fps with impact at 355 yards. He was quartering away hard, bullet hit furthest back rib and exited far side halfway up the neck. But the entrance wound was huge and the exit was small. I've never really seen an entrance wound bigger than bore diameter. The entrance wound was probably an inch and a half in diameter. Is this just because the bullet struck the rib and the bullet expanded before fully entering the cavity? I didn't have time to take pictures of the wounds because it was hot.