So far, so good. L to R is a fired .30-30 case, two cases run over an 8mm expander ball and a .357 Magnum neck flaring plug and finally a factory 38-55 case. The .357 plug was run in as far as it would go, the case mouth flaring is from the full diameter stem of the plug. A.375 plug should fit in but if not the cases can take a trip over the larger Lee universal expander plug to flare them out enough.

I was a bit surprised how little handle pressure it took to expand the brass using nothing more than RCBS II case lube in the necks. The .38-55 dies won't have an expander ball to run all the way through that constriction, just a plug like the pistol dies, but it should have a longer shank. Tracking indicates that the 38-55 dies will be here Thursday so I'll find out one way or another. As long as a bullet can be seated deeply enough to chamber the first firing will straighten the walls out completely. They'll be a bit short but that won't be a problem. Fun stuff. wink

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Gunnery, gunnery, gunnery.
Hit the target, all else is twaddle!