RE: Winchester Fail Safe Bullet
I use the FS and TSX bullets in both my elk and deer guns. Both do an excellent job, althought the TSX is a bit more accurate. I use the FS in my .338 and the TSX in my .300.
My hunch is that due to the solid construction of each bullet, neither will do much unless a heavy bone or...gulp....lots of meat is the impact point.
I really like the NPs as well, just don't use them anymore.