ASK712

There are many threads on the net about this issue especially especially with 9mm. Most attribute it to the brass being too clean. I dry tumble with walnut and still occasionally have the issue. I've found using One Shot case lube almost always resolves the sticking. I put my 9mm brass in a zip lock bag add a blast of One Shot, zip and tumble. Works great! I have a 550b with Dillon carbide dies and One Shot just makes everything run that much smoother.

The cotter pin is probably binding. It's suggested to use a straightened paperclip or finish nail, bent at the end, to replace it. Ant stiff piece of wire would probably work.

I use the same loads in both my 9mm handguns and my carbine. I use Titegroup and 700x with 124g bullets with no issues.

I love my 550b. Welcome to the club!

+1 for sending it into Dillon. A friend gave me an old 550b press that had been sitting in a barn for years. It was a crusty - rusty old looking thing. I sent it into Dillon and basically got a new press back about three weeks later. Actually it may have been a new press for all I know. It was well worth it. I figure my time is worth more.

I also have a 550b with this issue. As the slide extends out to pick up a primer it would chatter/drag a bit and sometimes not fully extend to pick up a primer unless I gently tapped it. My press is older and I noticed quite a bit of play in the primer housing. I made a new bearing as shown in this post but this did not totally solve the issue but did help a little. I then noticed that as the rod pushed the slide out it also place enough pressure on the right side of the slide to push the extending end to the left. This also caused the end with the primer cup to move right which made the bar bind in the housing. Since I had already made the new bearing, and made it a little wider than the original I had enough room to spring clamp a small piece of plastic on the left side of the bearing to keep the slide straight as it extends out. This solved the issue for me. I have loaded hundreds of rounds since without issue. Eventually I will call to get the new housing but for now I'm good to go. And if nothing else it gave me a good reason to spend a cold crappy Michigan afternoon in the home workshop doing something I enjoy. Attached is a picture to better explain.