Just a heads up in loading on the 550. I would late out some ideas about loading rifle rounds on a 550.
First off, I would process the brass in batches. Meaning I would set up the FL sizer die and size all the brass. Here is where a carbide expander ball on the Redding FL sizer comes into play, and help you out. I then would make sure it did not need trimming and then trim as needed. Usually once fired mil spec brass is rather on the long side. I would then clean up the case mouth. Then deal with primer pocket if it needs swaging or reaming! Then I would clean the brass up!
Then in station #1 I would put a universal decapper to punch out any tumbling media. And, load as you want. I would stick to powders that have a good rep in the Dillon measure. TAC comes to mind. VV 140 works too! RL 15, another good choice. Remember that it is best to seat in one station and crimp if you must in another station!
