To reload 223 on your Pro1000 you need a resizer die, Rifle powder charge die, and a seater die.
You can buy a set of Lee RGB 223 dies and a Powder Charge Die for not much at all. I set my seater die up so it wouldn't crimp as I don't load bullets with a cannelure in 223. I've been using the RGB dies for my AR match loads, and they feed just fine in my Colt HBAR upper, and my buddies White Oak upper. Mine has a 5.56 chamber and his has a Wylde, so unless you have a very tight chamber no need for small base dies.
Go slow at first. Lee recommends running a single brass through the press at a time until you get the hang of what each station does, and how it feels.
Machine guns are awesome until you have to carry one.