Actually, Churchill recommended (sort of) heating swelled shells in a warm oven (?!) Tough and brave men those old guys were!
MEC has offered a separate sizing die for their 650 line. I don't know whether they still do, or not. I suspect that such a device might help to bring these shells "to taw".
If nothing else,these shells could be "cut" to retrieve their shot and, maybe, some of their wads. Winchester target shot has been "top shelf" for many years, and Winchester's wads, especially their paper OP wads, have a number of potentially interesting applications.
