It also must be taken into consideration that HOW you blow the duck call can cause it to stick. You can actually be doing something incorrect inside of you mouth that makes the call SOUND like it is sticking. Examples:
*If you are not blowing HOT air, it is more apt to stick.
*Of course if you have a ton of spit running out of you mouth, it is more apt to stick. However you can overcome some of that by blowing HOT air.
*On some calls, if you blow too heavy, it can SOUND like a stick.
*Pinching your lips too tight can make it SOUND like a stick
I guess there are a ton. I blow RNT single reeds and I did snuff. That is probably one of the worst combinations you could ask for in the sticking department. Over the last year I've really worked on my calling fundamentals, like air production, and I stick my RNT calls MUCH less. So a high dollar, arguably one of the best calls on the market, RNT will stick as quick as any of them. Most of it isn't the calls fault, it is the operators fault.
You can find calls that are less apt to stick, but that doesn't speak for a calls ability to make duck sounds.
Just my opinion...
"I'll start spending less time with my dog and more with my wife when she starts fetching ducks for me"