I had a similar thing happen with a .25 cal 100 grain Nosler BT, a number of years ago. A doe standing broadside 200 yards away was hit perfectly behind the shoulder, and the bullet exited out the bottom of the belly. Only one drop of blood, and she ran a good 100 yards, even though one lung and the heart were damaged. The bullet hit a rib going in, and all I could figure is it deflected and tumbled. I did later learn that particular bullet was considered a "varmint" bullet, but I also wasn't launching it very fast, either. After that episode I decided 115's were my friend in the .25-06!
It's surprising that your 140gr Interlocks would not have penetrated straight. Any chance you hit a twig, so the bullet was tumbling when it arrived?
