no. to play .5/1 NL, you need $2000, if you want to stick around...minimum.

if you mean limit...then yes, $300 should be fine, but you can expect to earn less, much less, because your avg pot will be about $8, if you're lucky.

in NL, .50/1 blinds will avg about $20-$25...hence the larger bankroll.

if you cant play below 100 NL (.5/1 blinds), dont expect to stick around long...unless you get lucky.

and, if you want to get lucky...play the lottery...it pays better.

for $300, and i'm sure i've said this already, you should be in the $25NL realm, and thats risky enough. and should stay until you build your roll up to at least $1000.

find some bonuses, and build it faster.