Have been using the Barnes X since 1994 & now the TSX for elk. Taken numerous elk over the years. Used to use the Nosler partition for years before. The Barnes in my experience far out penetrates the Partition. As to weight retention it is not even close . Have recovered many partitions with their weight down by 35% at least. , but never a Barnes mono. When it comes to an acute angle shot on elk where the bullet must penetrate The Barnes wins big time over the partition. The Barnes delivers far superior accuracy in my rifles.What's not to like..