I do feel that the .223 is a bit light for feral hogs, unless the round is placed right behind the ear. For some of the heavier and more mature hogs we encounter, the 55gr pill won't penetrate the shoulder gristle. In the thick stuff, or overgrown hay meadows, it can be hard to get a good head shot. So for me atleat I prefer something more substantial than a .223, or even my wifes .243, and she is a very deadly shot with that thing...Yeah, I think a 125gr from the 06 would work on ferals, but again, best behind the ear if you can.. Good luck this season..