Georgia Joe,
Since I love to search I found another possible tube for ya, Carlson Choke Tubes makes and extended turkey choke with a .675 size for the 835 Ulti-Mag, part #19870 for $26.50. The Carlson tubes are made of heat treated 17-4 stainless steel, the same as Trulock chokes. Carlson chokes also offer a lifetime warranty. I would seriously recommend something no less than .670 and no more than .675 for the Dead Coyote "T" shot to get the best long range pattern possible. Because of it's compostion, it can be treated just like lead shot for choke purposes. I can't wait for you to see the pattern results when you try one of those "tight" turkey chokes.