Bankroll Skills.

[Heffer]

i don't play sng's but this is an article about bankroll management i think is fine: http://www.bet-the-pot.com/sng-and-br-stats-page18.html

and for cash games: if you stick to the 20buy in rule you're on the safe side but i think you can move to NL25 with 300$ as you have already some experience with it. if you drop down to 200$ move down to NL10 again