** Jefferies trims price target for Australia-listed shares of Amcor AMC.AX to A$16.98 from A$17.95, retains "buy" rating
** Brokerage highlights investor concerns about weak volumes; expects volumes to be down in Q1 and Q2
** Jefferies also flags weak U.S. consumer confidence, remains cautious on outlook
** Thirteen analysts rate the stock "buy" on average; median PT is A$16.74, according to LSEG-compiled data
** YTD, shares down 17.8%
(Reporting by Nichiket Sunil in Bengaluru)
((Nichiket.Sunil@thomsonreuters.com))