The guy from Carlson called me today to say that my internet order was going to take till May 1st ....b/c of an ordering problem the .640 choke was out of stock till then.
He explained that he thought that the .660 that they DID have in stock would probably be abetter set-up for me anyway ... he went on to say the the .640 was really for card shooters (whatever that means) and the pattern was great for a certain range and then it opened up too much for turkey hunting ... at least that's what he told me.......
Anyway, after talking to a couple of my buddies that know way more than me about this turkey hunting stuff they told me he wasn't leading me wrong....
I went ahead with the switch on the order, same cost but the .660 tube instead.

Moose, thanks for the offer, if the one I ordered doesn't pattern well I may contact you.
Thanks