Beef packer margins snapped a six-week string of losses and gained $73/head last week due to gains in beef prices and weaker fed cattle prices. Margis were still very weak by historical records (-$143/head) but at least started to trend in the right direction. Beef values are holding steady heading into the holidays and the recent collapse in live cattle futures and fed cattle values looks like packers will see a far rosier profit outlook for November and December.  Feedlot profitability was mixed last week ...