Apart from vaporizing a very light bullet with a too fast twist/velocity combination, the concern for matching a bullet to a barrel twist rate is one of accuracy. The faster the bullet rotates on its way to the target the more times it rotates before impact. The more rotations it makes, the more chances any imbalance in the bullet has to affect accuracy. So, the idea is to match up the bullet/twist/velocity for the fewest rotations for the best accuracy. 1/7 is a fast twist meant to stabilize heavy bullets which do better than lighter ones at longer ranges. It is not necessary to stabilize a 55 gr. 224 bullet. 1/14 works best according to the formulas. It boils down to fast twist-long (heavy) bullet-long range. Slow twist-light (short) bullet-short range.

http://www.shilen.com/calibersAndTwists.html

All this can seem quite academic and maybe even backwards, since most people seem to buy the rifle off the shelf and worry about the twist rate sometime after they get it home. Still, it is worth knowing especially when it comes time to rebarrel.