Not .308, but it may be relevant if it works in .308
I have a Browing A Bolt medallion in 30-06.
Got it many years ago and purchased multiple brands of factory ammo to test. Ammo included varies loads from Hornady, federal and remington.
This is no shit. I put the cheapest box down range 1st.... Remington Core Lokt, 180gr.
At 100 yards it shot a clover leaf.
I zeroed it and never tried another ammunition.
Went out and bought 20 boxes, 400 rounds for a lifetime of hunting ammo
Took a moose up in Maine with it at just over 300 yards, a few years ago.
Still have the other 30-06 ammo in the event of a SHTF situation.
I started reloading about 20 years ago.... never even considered trying to develop a load for it.