How come there's such a huge jump between the strength of the .50BMG and the other, less powerful cartidges? It seems like all other rifle cartridges are much smaller than the .50BMG. I've been told that most hunting rifles may not be able to stop a grizzly bear but a .50BMG would blow it to pieces. How come the .50BMG can flat-out destroy engines and machinery so effectively? Also, how do the .416 and .338 compare? Thanks.