X2 on the 160 grain Ace Hex blunts, I use them a lot and really like them. They work well on rabbits with head or shoulder/chest shots, and don't seem to skip or bury much when stumping either. Good blunt I reckon.
But those who recommend broadheads also right, broadheads work extremely well on small game too. But I won't use a broadhead when I've got my dog (a Blue Heeler) with me. When I hit a rabbit, she is onto it like a shot, and the thought of that happening with a broadhead in the bunny gives me the heeby-jeebys.
So, if your mate don't want to use a broadhead, and wants a good glue on blunt, I'd heartily recommend the afor mentioned Hex Blunt.
Best
Lex