Reagents can be used to lower the limit as well.
If you have magic 6 you can cast a force 12 fireball and then use 6 reagents to
lower the limit to 6 (so you only keep a maximum of 6 hits). This ensure that your overcast fireball that will annihilate pretty much everything in the area of effect (DV 12 + net hits up to 6, with a AP of 12(!)) only will cause stun drain on the magician (in this case DV 11 (stun)).
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I know, it's in my own emergency toolbox (haven't had to use it yet). But it's not really relevant to the Mag2 character we're discussing here.