Are you going to resize and trim them prior to reloading?
I think you're missing at least one step here, unless you're going to do this in two stages.
Are you going to lube the cases before setting them into the shellplate?
Once you resize you should check the length of the case to ensure it's still under specs. Trimming of .223 cases is often necessary.
As far as the powder drop, Hornady includes a few extensions; one will work with the .223 cases.
If you're doing this in two stages or steps, step one would be to resize and deprime. You'd then need to trim cases that are too long; I suppose you could prime before doing this, but I wouldn't; I'd make sure cases were good before doing that.
Then, once you've trimmed them as necessary, set up the press to prime, drop powder, and seat.
There *is* a way to do it in one fell swoop--using the X-Die and Lube Die from RCBS. Here's a video showing loading using those two:
http://www.youtube.com/watch?v=rqPJJinDr8Q
You can set this up to work on the LnL too, as the lube die which goes in station 1 has a decapping pin; the sizing (X-Die) goes in station two, powder drop in 3, seating die in 4, crimp die if you have one in 5.
But be aware: The cases used in the x-die have to be sized and trimmed in it prior to using the cases in this way. That is, cases need to be resized in the X-die, then trimmed to 1.74"; the X-die will keep the cases from growing past the max length spec.
I've done four resizings with twice-fired brass (that is, four X-die resizings for a total of six-times-fired with this brass). Darned if the x-die doesn't keep the case length growing under control. It's very strange, but I'm not complaining.
Maybe all that is more than you want to know--but if you're thinking you can do an entire progressive operation to reload .223 on a progressive press, the lube die and x-die are the best way, unless you're going to pre-lube them prior to sizing on the X-die.
