It took him no time to destroy a large Wubba, the big Kong Wobbler, the Kong tug toy, tennis balls, etc., etc. Surprisingly, the small Wubba held up best, as well as a small Nylabone toy that can hold treats. I found a site online that sells a variety of whole and split antlers at a price far lower than the pieces of antlers from Per Smart.
Chief has chewed some points off, but he thoroughly enjoys chomping on these. The antlers have held up the best, by far, although they aren't very interactive.