buy above 255 in intraday and swing for swing make sure stock closes of 255 on day close if you want to take less risk exit from swing trade if closes below 255.
For Intraday Stoploss use 5 minute chart and see nearest support. for target also use 5 min chart and fibonacci pivots as i don't keep predefined target. always try to book partially on good move and trail.
NOTE: For Gapup or bo before 9:20 If gapup is more than 1% from bo level than avoid completely. if less than 1% or gives bo before 9:20 than wait for first 5 minute candle and entry above 5 minute candle and revised SL below candle Low.