i had the exact same thing happen. I sent it back to sig and all i got was they replaced the extractor and removed an o ring??? I asked what oring and they said the gunsmith didn't put it in the notes so who knows. it works great now.
I just want to throw this out there. I've got an ao built 300 win mag that will shoot 3/8" moa all day long with black hills ammo. It just happens to be for sale too