Most people don't realize that most(notice I said most) chisel point broadheads(I use Muzzys so they are the stype of chisel point I am talking about, not the cone pointed ones) can be sharpened so they become cut on contact.
I believe Thunderheads come with an edge.
Put the tips to a stone and most will come out razor sharp and hold that edge.
What do I like? Cut on contact Chisel point broadheads of the brand Muzzy!
Greg
"Getting close to the game is the joy of Bowhunting for me, the harvest is a bonus."
Live 15 ft Python after eating a small Antelope!