If you look at Palma match rifles in .308 for those 155's they all seem to have 13" or 13½" or 14" twists. Some folks shooting light varmint bullets in this diameter get 16-18" twists.
The 10" twist was developed for the 220 grain RN FMJ issued in the 30-40 Krag, and they experimented with some heavier ones, but probably didn't like the recoil. Anyway, for those big bullets 10" was probably a near optimal choice. Lighter bullets don't need to spin that fast. They just didn't bother to change it for 150 grain bullets when they went to 30-06, even though a 12" would have been plenty, even in pretty extreme cold weather. Then they came up with the 173 grain bullet, and the 10" shot that happily, too. Today, the 5R rifling in the M24 is geared to the 175 grain Sierra MatchKing bullets, which are just slightly shorter than the 173's, owing to a shorter boat tail, and its got 11¼ inch twist.
At the same time, match bullets are so well made these days that it seldom seems to hurt much to have a faster twist. Any mass asymmetry causes a bullet to spin eccentrically, and the faster it spins, the more eccentric the spin around the trajectory line is (aka, wobble). This causes groups to open up. Back when the 10" twist was devised for the long, heavy bullets, it was probably the minimum that met military requirements under all expected weather conditions, as extra spin decreased accuracy. Today, benchrest shooters firing shorter ranges use relatively short, stubby bullets so they can get away with slower twists. That's because, when you are shooting one-holers, you can still pick up on the spread caused by wobble due to over-spinning. But for those of us shooting half moa and larger, match bullets are made so well now that it is hard to see the error the extra spin causes, if you can see it at all.
Other effects from spinning more than necessary are greater spin drift and the amount by which the bullet rises or falls while deflecting left or right under the influence of wind, also increases with rate of spin.