Re: PERFECT .308 ROUND
Federal Gold Medal Match (FGMM) .308/175s are very popular for long range shooting and normally render decent results.
As posted above, it's largely a matter of what your rifle likes and Black Hills shoots well for a lot of folks too.
Often, 168s won't remain stabilized at extreme ranges from a .308, due to relatively low BC, mediocre initial velocity, low velocity retention coupled with higher air densities. At sea level (Quantico MCB) on average days, 168 SMKs *always* destabilze at 800 to 900 yards and I see a lot of sideways strikes. People shooting in lower air densities and with longer barrels can often see decent results to 1k.
I have two .308s, a 20" LTR and a 26" VS and both prefer the FGMM 175s over the Black Hills loading of the same bullet. I shoot both rifles beyond 1k regularly with decent results.
I've tried factory loaded 155 Scenars and they didn't shoot as well in my .308 rifles as the 175 SMKs. I haven't done a lot of load development with 155s in the .308, but I have a 3,150 fps, 3/4 moa load with them in my .30-06 Ackley that does very well at longer distances on targets.
FWIW, I shot a bedded deer broadside with the .30-06 AI and a 155 Scenar at a lasered 392 yards and hit him on the point of the right shoulder, broke that, broke the far shoulder and left a 1-1/2" exit. He was DRT and never got up, but I did hit a lot of bone.
The beatings will continue until morale improves.