My Palma Match .308 rifle was still shooting well enough to compete in prone matches to 200metes, at the 15,000 round count, but I had to go to 190gr. MK's.
The throat had advanced some 7 to 8 inches ahead of the breech.
I cut the barrel to 22" (5" off) and rechambered it for the .303 Pygmy(not my name), which manages to shoot 1/2" to 3/4" with 130's and 125's, yet the rifling does not start within 2" or so of the case mouth. You can see the land memory in the steel, but "memory" is all it is.
That was a chrome moly 4-groove cut rifled tube, pretty sure.