300BB rule enough for the casual internet poker player?

[kindling]

So using your example bankrolls, and suggested guidelines of 300 Big Blinds for Limit, and 20 Buy Ins for No Limit, this is what it works out to:

$300 => 0.5/1.0 Limit & 0.05/0.10 NL (aka NL10)
$3000 => 5/10 Limit & 0.5/1.0 NL (aka NL100)

The numbers work out that you're slightly overrolled for the NL examples, since at $400 and $4000 you can move up to the next limit. The good news is that if you are willing to move down when you hit a downswing, you should not ever go broke.

Also, I liked these guidelines from Chris Ferguson. They're simple and should keep you out of trouble:
http://www.fulltiltpoker.com/pro-tip...on&tip=100

[DMoogle]

There's nothing wrong with being over-rolled. You should be moving up when you have the bankroll AND the skill to beat the game at the higher level, not just the bankroll.

After the UIGEA I became a break-even $.50/$1 NL player, so I moved down to $.05/$.10 NL to re-evaluate my game, even though my bankroll was over $5K!