Carlon's web site states the 2 gang box(with integral clamps) has a capacity of 32 cu.in. According to (99NEC) Table 370-16(a), a 30.3 cu.in. box can contain six #6. Subtract two for a receptacle and it's still legal.
Edit - Does the 6/3 fit into the integral clamp?
[This message has been edited by stamcon (edited 11-16-2005).]
