In relation to the stingray, line capacity doesn't matter. You'll be lying on the ground with back spasms long before you get spooled by a 2m stingray.
 

standard 300m spool no probs at all

 Thanks for the replys.

 for 2 meter tiger sharks you would need at least 800m and for stingrays depends what size the are.

 300m is plenty for most sharks, even the genuine monsters. They usually head out a bit then travel parallel to the beach so capacity isn't so crucial. Rays on the other hand tend to head straight out so more line is needed at times. 

depends on whether you're casting, Kayaking it or Ballooning bait.

Casting 300-400m should do it

Generally kayaking puts your bait out at 300-500m

and ballooning can be as far as 350m

so bearing in mine 30lb line = 10 lb drag. I would suggect as a rule of thumb, amount of line = distance the bait is out + 300 metres.

 I got a 1.75m tiger off dunsborough using 300metres of 30lb braid, had no problem.     Max

 When fishing off the beaches in Exmouth, I got spoiled a couple of times on 300m of 100lb braid. 

 what reel?