Get the Pacesetter set – FL resizer, seater and FCD. You do not need a Neck Sizing die if reloading for an AR. Those are more appropriate for bolt action guns, but semi-autos require FL resizing to reliably feed and extract. The FL resizer takes care of all sizing requirements, it squeezes the body down, bumps the shoulder and squeezes the neck to the proper dimension.
Since your experience so far is w/pistol reloading, I’m going to assume you didn’t bother with trimming, or you found out trimming was necessary only after several reloads. You probably won’t find that to be the case when reloading bottlenecked rifle cartridges, they tend to stretch more during the FL resizing operation. What this means is you’ll need to trim cases more often, and this presents a challenge if trying to go through all necessary steps in four sequential steps. Also, you’ll need to lube your cases for the resizing operation, and at some point you need to remove this lube. Also a challenge.
You mention you have four holes to manage all of your steps. This implies you want to go from start-to-finish in four operations. I’ll submit you’d be better off dividing these into two separate groups of operations, the first being case prep and the second being actual loading of the cases.
Here’s how I did it when I started out with a Lee TP, before migrating to a Dillon 550.
Case Prep — batch process cases
(1) Get a separate toolhead and mount your resizer in this.
(2) Disable your auto-advance. You want the press to operate like a SS at this point.
(3) Lube your cases with whatever lube and technique you choose (spray, roll them on a pad, shake them in a ziploc, whatever)
(4) Resize cases
(5) Remove lube (tumble, wipe off, whatever. If you tumble them, make sure the flash holes aren’t plugged with any media)
(6) Trim cases
(7) Optional: prime cases using hand held priming tool. If you forgo this step now, then you’ll have to prime them on the press during the loading sequence.
Loading Sequence
(1) Re-install auto-advance mechanism
(2) Configure 2nd toolhead with either decapping die in station 1 (only if you are going to prime on the press) or a Universal Flaring Die (optional); otherwise leave it empty. If you choose to install the flaring die, adjust it to just barely kiss the case mouth. You’ll flare less than you do for your pistol brass. If priming on the press, this is where you’ll prime, on the down stroke.
(3) Station 2 – Rifle Charging Die, w/disk measure. Consider adding Lee’s Hopper Riser, especially if you elect to prime on the press or if you load extruded powders. Micrometer bar will max out sround 23-24 grians IIRC, so it barely works with ball powders. For extruded powders, it’s not big enough and you’ll have to use the Dbl Disk Kit.
(4) Station 3 – Seater. Adjust so no crimping occurs. If you used the flaring die in Station #1, you can adjust so it squeezes the flare down a touch, but don’t adjust so much that you apply a crimp. At this staion your goal is to just seat the bullet to the correct seating depth.
(5) Station 4 – FCD
This worked best for me.