Daryl, I'm keen to convert 223 brass to 375 projectiles too. Some guys at the club have done this but I'm not going to get a chance to catch up with them till early next year (I was hoping to make some over the Christmas break, if possible).

Without trying to highjack the thread too much (maybe there is already a thread on this), do you leave the rims as is? and what resizing/forming gear do you use?