500Nitro
I fired two of those 250gr R.N. bullets at the phone books
about 14" long at 3000fps. The first one only made it about 5" the second one made it all the way and came out in about
a 1" hole so I guess it mushroomed. Couldn't find it. It kept on going.
I had a double set of phone books used one for each shot.
So I would think for sure that these R.N. bullets will brake bones and would go at least 14" deep in mussel.