** Beverage can maker Rexam poised for biggest ever1-day pct move as it confirms it is in takeover talks withUS-listed Ball Corp
** Stock jumps 26 pct, adding $1.3 bln to co's market value
** Easily most actively traded stock on FTSE 250,with almost 6 times 90-day daily avg volume having gone through
** Stock in 4th day of recovery off 2-yr lows (RM: tricia.wright1.thomsonreuters.com@reuters.net)