Sensex climbs over 250 pts on buying in Reliance, M&MM&M was the biggest gainer on the Sensex chart, rising 5.97 per cent, followed by JSW Steel, Ultra Cement, Kotak Bank, ITC and NTPC. Reliance Industries gained 0.73 per cent to close at Rs 2,871 apiece. In contrast, TCS, HCL Tech, HUL,...