Regardless of whether or not your shot landed exactly where you intended, it's time to see who's been flattened by it.
The model (if there is one) under the template's central hole is unlucky enough to be hit directly by the stone thrower's massive payload – they take an automatic hit at the higher of the stone thrower's two Strengths (normally 10). If the template has scattered, there's a good chance the centre hole will lie over two or more models. Nonetheless, only one can be hit by the higher Strength, so select one randomly.
Other models wholly or partially beneath the template avoid being clobbered by the main payload, but instead are showered by bits of loose rock and, after the payload has landed, fast-moving chunks of battlefield (and possibly bits of the warrior who took the full brunt of the shot). Such models are hit automatically at the stone thrower's lower Strength (normally 4).
The stone thrower's Multiple Wounds (D6) special rule applies only to the high-Strength hit caused against the model under the template's central hole – unsaved wounds from the low Strength hit are not multiplied. This makes the stone thrower very good at disposing of enemy monsters and other resilient models as well as dealing horrendous damage to massed ranks of enemy warriors.