Gaaa. You young whippersnappers don't know just how easy things are these days. Why, back in 1st edition, a fireball spell always covered its full 33'000 cubic foot volume. If that meant it was going to travel 330' down a 10' x 10' corridor well then that's just what happened.
I remember there was a game one time, the DM was a real stickler for the rules. Insisted that the Magic User (none of these namby little sorcerers, too dumb to memorize their spells for us) declare the target location for spells without measuring. Lemme tell you, we were facing a whole slew of bad guys spilling out of the mouth of a cave as we were arrayed around them in a rough semi circle. Rough mind you, noone had measured out the a fare-thee-well where their character was going to stand. My initiative came around after they were out and almost upon us and I knew I needed to blast a bunch of them with a fireball before one of them had time to kill the princess we were there to rescue. I looked at the board and the figures and said "right there". Well, the DM got out his calculator and figured out how much of the fireball was outside the cave, and figured out the radius of a quarter sphere with that volume, pulled out his measuring tape, and found out that I had killed every one of those no good stinking varmints without even singing the toes of any of the party members.
And since I killed them all, the XP were all mine!!!
Erm, what was the topic of this here thread?