I have shot a # of deer with cast boolits, from 80 to 245 yrds, pure lead (200 yrds with a .54 ML and conical) and coww to hard cast commercial bullets (most between 12-1400 fps, never more than 1700). I have yet to recover a boolit from any of the carcasses but one thing I noticed with every one is a clean little round entrance wound and much more tissue disruption at exit than would be made by a "still stabilized" non expanded bullet. What I mean by this is that even tho the bullet doesn't expand, the length of these big slugs cause them to "tumble" creating as much damage as any expanded bullet would.
As I mentioned I have never recovered a cast bullet from a carcass but have recovered lots (mostly coww & hard cast) from other mediums, from clay banks to wet paper/cardboard to solid wood blocks and without exception every one has had one thing in common...while some may have a "smear" of expansion on the meplat, they all have a bend somewhere in the long shank, even the hard cast. When they bend they can't help but start to tumble I think.
Looking at the elongated wound on the pictured doe I would think the bullet had a tumble to it when it came out also.