Usually I have no trouble figuring out problems that crop up during reloading; this one stumps me. Most recently when I run .380 cases into the expander about 40% emerge with a bulged ring around the case body. I use the same deluxe Lyman die set as always and case brand, etc, seem to make no difference. Some rings are barely noticeable and some are problematic. I use cleaned cases as before and mostly new to once fired and reloaded fired. These variables have no pattern. Anyone have a clue haw this is happening? The only solution I can come up with is to run the loaded cases into a larger (.38sup, .38spl) die to reduce the bulge.