Ive got a remington LTR in 308 I know its not the sps but it does have a 20" barrel. I Thought i could throw some accuracy data and velocities your way instead of commenting on the stock
The only .308 match ammo I shot was one box of federal 168 gold medal.
for 5 three shot groups at 100 yards they avg 0.804" best grp was .611 but i don't have any velocity's for the factory stuff.
Crap just looking at all my data I didnt record any velocities for the 168's sorry bout that
As far as accuracy my gun is a tack driver! using powders like varget,h380 or RL-15 groups are usually .38"-.50" depending on the load ,I use only federal 210match primers. My gun shoots best with the 175gr matchkings but they are very slow around 2200-2460fps Im guessing you would be looking at 2500-2600fps out of the 20" barrel with 168's? My 20" barrel .243 has averaged about 250fps slower than loads listed with a 24" tube.