If you had Improved Critical (Ray) or Improved Critical (Energy Missile) they would work just as well as Improved Critical (Big 'Ole Axe).
The question really is are they a good choice of feats? Choice is up to you, but for a straight Wizard or Sorceror, it will be a while before they even qualify and unless they cast a LOT of that kind of spell it probably won't come up much.
Edit: Oh, and KReynolds. Couldn't you gain the +1 to hit on a Fireball even though you are rolling to make it through the opening and not to actually hit someone?
If you are more accurate within 30', I would think that would still apply when trying to toss a Fireball through an arrow slit.
The question really is are they a good choice of feats? Choice is up to you, but for a straight Wizard or Sorceror, it will be a while before they even qualify and unless they cast a LOT of that kind of spell it probably won't come up much.
Edit: Oh, and KReynolds. Couldn't you gain the +1 to hit on a Fireball even though you are rolling to make it through the opening and not to actually hit someone?
If you are more accurate within 30', I would think that would still apply when trying to toss a Fireball through an arrow slit.
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