.690?
in an 835?
Let me google this a second....
Oops, more junk, the 835 is served at the average 675... http://www.indiancreekss.com/home.htm

The standard constriction is .675, but they will make it any size that you want.
This is one of the reasons that I like this company, great customer service, and great choke tubes.

Kingvjack, I highly recommend the Jellyhead. Dont spend all that money on an IC when you can get the same results with the Jellyhead, which is almost half the price. And youCAN get the same results, because im doing it every time i shoot mine. I use the same gun also. Good luck.

Mine patterned beautifully with the factory extra full choke using Federal #5's.

[:@]I tried one and hated it, threw an undertaker in an 835 and noticed a dramatic improvement.

Same thing happened with me. It patterned "good enough" to kill a turkey out to about 30 yards. I went with the Jellyhead, though, and saw a major improvement.

I have an 835 with a Jellyhead and get an awsome pattern at 40 yards. A few of my friends tried to talk me into a Rhino Choke but I think that I get just as good of a pattern for half the price.