If a 130/270 bullet made it all the way through, it way it would be because it didn't expand much, if at all. At full 270 Win speed that bullet would not make it through five one gallon, water-filled jugs as it would expand a lot, and more than likely become shrapnel. Water tends to be a very hard expansion medium for high velocity, expanding projectiles. A water test may or may not tell one much about a relatively low speed impact with a bullet designed for high velocity. If it did show no or little expansion however, that would be indicative of the most you'd likely get in a soft-tissue impact on an animal.
