I also have problems with my 308 Hog Hunter being difficult to chamber a round.
The rifle was purchased new.
And sometimes not wanting to eject the casing, on occasion I've had to use insert my cleaning rod down the bore to get the bolt back to eject the spent casing.
I FL size my casings every time, I've used a Lee fl die & a RCBS fl die and it doesn't seem to make a difference.
ALL loads were in the middle of the recommended reloading data and no mag primers were used.
I've used both beam scales & electronic scales, and different powders that were recommended for the 308.
OAL of case is within tolerances.
OAL of loaded round with tolerances.
I'm at a loss.