I am going to start loading limited quantities of .223. I load on a Dillon 550. At least to start, I probably will use station 1 of the dillon as a single stage press, and weigh every charge. It occured to me that the rim diameter of a 9mm and a .223 were very close. I tried a .223 in my 9mm shellplate and it fit pretty well, though just a bit looser than the 9mm. What I'm wondering is if I can get away with using my 9mm shellplate and avoid the cost (at least for the time being) of buying the .223 conversion kit(about $40). It almost sounds like I should try it, but then I can just see myself getting the very first case stuck in the die! Anyone ever try this? Successful or a disaster?