I've had great luck with the new "No Mercy" Zwickey heads. I got a kick out of the story on the back of the package about how Jack came up with the name.
I shot 4 water buffalo and a bunch of whitetails with them. My wife also had good results with them.
flatbow MB, I thought offering the head in RW & LW single bevel was just a good idea. Jack isn't at all into marketing hype. Plus the fact that some folks don't think much of single bevel heads and probably never will.
I think the steel in Zwickey heads is superior to many of the other heads out there. I've heard it is something in the heat treating process. Haven't seen any in the "elf shoe" bowls of damaged heads in the african bowhunting camps I've been too.
The Zwickey construction design was patented in 1942 and has been copied many times.
Here is an interesting quote from a letter I received from Jack - "The Eskimo's cutting edge was shortened by the swept forward rear edges way back when to make it easier to extract from straw bales used at field shoots at that time."
I haven't used the single bevel type yet. Talking to Danny at 3Rivers peaked my interest though. He said imagine a string following the wound channel with a double bevel head. Now how much longer would the string be if a single bevel head rotated as it passed through? I've always had good luck with Grizzly heads, so I think I'll give them a try this year. Danny also had a way to get the sb heads hair poppping sharp.
There is a bunch of good heads out there that are more than adequate. I guess part of the fun for some of us is messing around with different ideas and dicussing them and there isn't anything wrong with that.