I got 9/10ths of the way to fixing this by experimentation yesterday. Yes, the die doesn't support the case so without anything being wrong with the die it still requires more from the other parts of the reloading system than dies that do engage the case body to centre the neck. The press unfortunately is worn, but the fix was to rotate the shell holder by 180 degrees and feed from the other side.... not perfect results but much much better. I haven't worked out what exactly was wrong and why this has made an apparent improvement. I'll see how the rounds shoot before saying any more. No need now then to modify a Lee as previously planned though. Thanks again for all the feedback.
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