I think Winchester X brand .22's just had a recall, somethin bout too much powder.
"Olin Corporation, through its Winchester Division, is recalling several lots of its WILDCAT® 22 (Symbol Number WW22LR) and XPERT® 22 (Symbol Number XPERT22) 22 Long Rifle rimfire ammunition."
Dont know how current this is but I saw it over on the Firing line.