Re: Where did my .270 win go wrong
Depends on a lot of things. Sounds like an individual bullet problem and not a rifle or caliber problem to me. You could have witnessed a jacket separation failure, a tumbling failure (although unlikely unless your rifle has a really slow twist rate for 150's out of a .270), or any number of things.
I doubt it's a failure to expand though. If it were, you'd have seen a caliber-size hole for an entrance wound, and a caliber size hole for an exit wound. That's usually the first signs of a non-expanding bullet.
I'm assuming you weren't able to retrieve the bullet, huh?