Seems like I always get a bigger exit hole. The entry hole is usually bullet sized in any of my rifles but the exit varies alot. Depends on whether you get clean passes or hit bones or the type of bullet used. But never had a smaller exit hole. The bullet doesnt (or shouldnt) expand on impact anyways. It should expand as it passes thru the target or animal. The skin on entry side should be about the size of the bullet but inside the ribcage view usually shows a little sign of expansion on the entry side of the cage and more on the exit side, with a bigger hole thru the skin on exit side.