Depends on the regular volatity, and i expect that if your a...

Depends on the regular volatity, and i expect that if your a trader then that is the kind of shares your targeting.

No use using say a 5% stop loss trigger on a share that swings 3-7% per day.

Likewise you dont want to be stopped out by a low volume dump from someone who had to get out.

What is more important is good risk management. Generally i use a 10% stop loss on speccies, and each speccie never exceed's 10% of my investment portfolio. Probably too simplistic for some people but it works for me. I also use a timeframe for expected announcements and price targets.

Hope that helps.