Beef packer margins strengthened for the fourth straight week and posted one of their largest weekly gains of the year. Margins rose $42/head to $57 as fed cattle prices slipped another $4/cwt and the cutout held near recent highs. The move pushed packer profits to their firmest levels since early summer and widened the spread between the cutout and breakeven values. The short-term setup still favors firm margins into late November as cattle supplies stay current and carcass weights remain steady. Any material slowdown in beef movement, however, would leave packers vulnerable to a quick retreat given the still-elevated breakeven. Feedlot placements improved modestly as ...