I like Woodleighs a lot, but have seen the flattening when they're pushed beyond their recommended muzzle velocity. In fact, I once saw a 360-grain Woodleigh .416 stopped by a fallow deer doe that at most weighed 100 pounds.
The rifle was a .416 wildcat that pushed the bullet to 2650 fps, and the shot was placed just behind the rear of of the ribcage as the doe quartered away. The bullet was recovered from the skin on the opposite shoulder (literally from the skin, as one petal was poking through). Weight retention was great, but the bullet was 2-1/2 times as wide as it was "long."
