The passing through of a bullet depends on many factors.On a mature Moose the bullet should be strong enough to retain at least 60% of its weight.Given enough ft lbs of energy it will pass through unless it encounters bone on the entry side.The path of the bullet can change dramatically at this point and prevent it.
I have found that the best kills are often when the bullet is found under the hide on the opposite side of the animal(regardless of species) The more expansion and energy released in the chest cavety the faster the kill.
Many of us hunt with only one rifle,anything from a 270 up is fine for Moose.
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