Bill, my only data is LMB eating AM600. 18 3/4" and right at 6 pounds. I've seen her in the pond, but haven't caught her since. That fish was caught in 2014.
They turn their noses up at AM LMB pellets.
I imagine she's thinned down some as I've been feeding Optimal this past year and the larger LMB don't like the small pellet size.