Yes I do have a 308 Win chanbered BAR stalker I can measure.
Where did you take your measurements from?
I will say that after writing the first response, I happened to have
the BAR out for a whitetail hunt, and I took a .25-06 Rem. load(built
on a .30-06 Sprg case), which I happened to have on the bench,
and the action port was not even close to accepting a loaded
round. So I am going to stand by my first "guess", that the BAR
has two different action lengths.
Squeeze