I ran different brands of Dies on my 550's pretty well. On at least two of the stations,you still need to use the Dillon die lock nuts, as there is not room for the bigger ones that come on Lyman and Lee dies. I had trouble with one die not reaching down far enough, but I cannot remember what make it was. That was probably 30 years ago.
Thanks for the replies. Actually the carbide collar came out of the die and stuck on the casing. The casing gauged okay but sure is stuck. I just ordered a Lee die from Midway, lik doing business there. Thanks again