That's the hallmark of a "true" improved cartridge, the ability to fire the parent cartridge in an improved chamber without alteration.
I currently shoot three improved cartridge and a wildcat in the improved configuration , a 22-250, 250, 280 and the 'cat 270-08 Imp 40. For the first three I simply load and fire their parent's brass. For the 270, I run 308 Win brass in a 7-08 FL die sans expander stopped short to create a false shoulder for a .004"-.005" crush fit in the 270-08 Imp chamber.
Bill
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