My Nosler manual (fifth edition) shows 180s to 2700 fps in the 308, via 24" bbl. In my experience cutting barrel back, that should easily make 2600 in a 20".
I buy that and will add 2,750 shouldn't be a problem with a 26" barrel. Definitely not with a 22" barrel.
Every 22" 308 I've had would run 180's 2,625 to 2,650 confortably. I had one 19" 308 that would do 2,600.
My other 308's had 18.5, 20 and 24" barrels but I never ran 180's in those.
