What is the longest/deepest penetration you ever got from an expanding bullet?

36 inches plus
What was the animal taken?

spike bull elk in 1993
What was the bullet/cartridge/load used?
Gary used R 22 powder, 140 Barnes X bullet, .270 Win., a 26 barreled rifle and gets a little over 3,000 fps at muzzle.

Were you happy with the result?
The first shot at 100 yds went through heart and both lungs with thumb sized hole. Elk was dead but both he and my partner didn't know it. It was on steep slope so my friend shot again as the elk ran quatering away downhill. The next shot hit the hock joint on the left rear leg, went through the paunch, ranged across chest cavity and broke the right shoulder bone and stopped under the hide. The bone in the hock took the petals off the x-bullet. The front of the bullet was a .40 cal meplat. We both have used a lot of x bullets since then. No more recovered bullets. My .338 WM with 225 Nosler partition at 2700 fps gave similar pentration on a bull moose but did't hit the hock joint first, but the moose was a much bigger animal.