I have never crimped my hulls and some of them have been shot over 50 times without splitting. I use 60gr FFg, 1/8" 11ga nitro card, red claybuster or Win wad, 1 1/8 oz shot (overkill for some, but there remain some stubborn targets around these parts), and an 11ga overshot card that is a bit loose, glued in with elmer's wood glue. Big boom and impressive without a crimp, so I don't think that will make much difference.
BTW, that is the same load I use in Remington gold nitro or green STS hulls, minus the cards.