Dan,
If you're talking about the "Blackhawk Only" loads common in loading manuals the answer is: No.
I'm thinkin' Terry misread your post (or I did). Yes, the Anaconda is strong enough for the standard power range listed for .45 Colt, but the special loads for Rugers and Encores/Contenders are a no-no.
Thanks JOG & 2muchgun, I did miss that part, I am getting slow in my old age.:o <img src="/ubbthreads/images/graemlins/frown.gif" alt="" />