I have been using a 550 for over a dozen years. It's great for revolvers because it has the best primer seating feel of all the Dillon presses.
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How difficult/time consuming is it to change calibers? I've read that they are easier to change on the 550 than they are on the 650.
I tried to load for my AR on it but I just could not get the powder regulated correctly. I don't know what I was doing wrong but it was just inconsistent. It had to be me but I sold the .223 caliber conversion kit and went back to the Lee single press for them.