In my K9 and MK9 (and G26) they all shoot within an inch of each other at self defense ranges of 15m and less.
Never an issue with any of my guns and regularly mix them up in the same mag.
At longer ranges (I practice at 50m a few times a year, last year I practiced at 100m just for giggles) it seems the 147g subsonic hollow points were the most consistent. But with those short barrels the groupings were nothing to brag about no matter what the ammo used.
All that is necessary for the triumph of evil is that good men do nothing.
NRA Life Member