Iíve got a Savage model 11 in .308. Iíve got some once fired brass so I neck sized it.
If the brass didn't come from that rifle; full-length size it.
But your bullet looks like it has been in the rifling. Is the scuffing on 4 sides, how many lands are there?
How much longer is the COL from the suggested COL?
Is it tight without the bullet?
I would seat the bullet to the suggested length, then try, (if need be,) with the full-length sized cartridge.