Jim, the rim recesses look like they could be causing the problem and fortunately I didn't have to spend money for someone to fix that, then shorten the strikers, then adjust timing, and so on until the problem eventually was (or wasn't) corrected. I use AAHS, Winchester comp-formed, and Fiochhi hulls without a hitch. The only time the gun has been hard to open is when I used Winchester primers. Unfortunately until a couple of years ago they were the only primers I used so I don't know if changing would have helped a couple of other guns I had the same problem with. The idea to try a different primer wasn't mine. It was recommended by several people on another forum so I'm not the only one that has seen this problem go away by doing that.
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