Bill:The market weights on hogs have chained greatly over the years. About 40 years ago we used to sell at 220-240lbs. As the years went by the desired weight range inched up. When the the market crashed in 1997 and hit $0.07 we were selling at the 240-260lb range. Today a 300lb market hog is not uncommon. When my youngest son wanted to show hogs I had to re-educate myself and boy had things changed. He was showing hogs in the 300lb range. As for the biggest we had, there were two. We had ole "Gentle Ben" who was a herd boar. When we took him in he weighed 840lbs. It was not long after that we took a old Landrace sow in and she tipped the scales at 860lbs. I have a feeling they both went to Pizza Hut as back then that is where a lot of the old fatties went.
A customer raised hogs (up to 40# then they got moved for someone else to finish) and said that a brooder sow that was past her prime goes for pennies per pound and they make great ground pork.