Although I have never tried fire forming .22 K Hornet cases I do shoot a .17 AH and several other Wildcat rounds that I have to fire form brass for. I don`t know what you mean by streach alot, but I have never had any trouble fire forming any round with a factory load equivlent. I have loaded some rounds to lite for my .257 Ai and have them not form completely, but I just loaded them heaver and fired them again. I got to where I work up to close to max. loads for fire forming and then take them hunting.
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Catfish
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