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Posted 20 March 2016 - 08:31 AM
Recently I began having problems with my 550 primer system. Primers in the cup were occasionally upsidedown or on their side.
I was told about the weighted primer follower and tried that. No help.
When coming down with the shell plate I was hearing a small click. Followed up on that and found that the primer cup was not centered in the shell plate platform hole. The cup was catching a very little bit on the shell plate platform as it came down. When the cup slipped free of the shell plate platform the spring in the cup rebounded, bouncy the primer slightly in the cup. Sometimes the primer got screwed up.
I spent a lot of time trying to recenter the primer cup. Also tried cleaning and lubricating. No help.
Finally after sitting in front of the press for hours, studing, I found the problem. The "shell plate platform" which is under the shell plate & home to the little ball bearing had turned very slightly. The two bolts which hold the platform go thru holes which are a little to large which allows the shell plate platform to turn some fraction of a degree. I loosed the two hold-down bolts, took up the slack in the bolt holes.
Primer cup now travels smoothly thru the shell plate platform and no more up side down primers.
Ruffian