I have a savage 10 .308 with a 1:10 twist. My local shop got stacks of federal gold medal 168 gr and 175 gr sierra matchking ammo in and i went ahead and invested in the 175gr cause i had shot some other 175 s and was already zeroed for them but are the 168's more accurate closer range. I heard 168's are a tighter grouping round unless your shooting past 600-800 yards, then the 175's are better? Whats your guys experience? Whats better for getting tight groups at 100 yards? That being said when the stars align i seem to shoot the 175's well but seem to be tough to get them 1/2in or less.