It really scared me on a Aoudad hunt once. If the first shot wasn't dead on
the money I might have blew it (and I thought I had).
Follow up shot was over its back and the third shot I aimed up under its belly,
catching it in the left flank, found the bullet in the brisket.
I like ALL my shots to go where I aim.
Yikes. Sounds like more than a little wandering. I'd be looking at the scope mounting system, headspace, timing, etc; a single round shouldn't be capable of imparting enough heat into a barrel to cause a complete miss like that.