Last month there was upto 240 points slippage on one day.
240 points slippage!! Seems either I have not understood
what slippage is, or you are erring somewhere!! One of us is erring!!
For me slippage is : The difference in trigger price and actually traded price when a Stop Buy or Stop Sell order is placed.
My expirience is that depending on the level the slippage is from zero to 7 points!!!
On one occassion, I was to buy at Market if Nifty touched 5103, from 5103 Nifty went straight to ~ 5112, my trade did not happen , because, the system feeds in the market price as 5103 is traded, in my case it showed buy at 5103.85 but market never trade at 5103.85 and jumped to 5112! At other times I opt to give a spread order rather than market. Buy upto 5105 when trigger price is 5103.05 !!