I do not question that the Dillon machines are the way to go, if you have decided to go to a progressive.
For me, however, a progressive doesn’t jibe with how I reload 5.56 (or most bottleneck rifle rounds).
My routine is:
On return from the range, the brass is decapped (using an RCBS Universal Decapper), lubed (don’t forget to put a dab of lube inside the neck of every fourth or fifth case; a Q-Tip works just fine), and FL sized. Brass then goes in the tumbler. When bright and shiny, brass goes in a plastic tub labelled: “Decapped, Sized only”.
When the spirit moves me, I take the contents of the tub and perform the following operations:
All cases are gauged.
Anything that exceeds 1.760" is trimmed to 1.750"; necks are then deburred inside and out.
Priming done on RCBS Auto Priming tool. Each primed case is checked for sub-flush using Mark I, Mod. 0 finger tip.
Cases charged and bullets seated.
OAL checked for 2.250 on a spot basis (just seeing if the die has backed out of the press or the stem has backed out of the die).
In essence, I “batch” load these rounds, not because I have to but because I want to. A progressive doesn’t really work for “batch” processing.
In evaluating the usefulness for you of how I do things, bear a couple of points in mind:
I like reloading. Consequently, I’m not in a hurry.
I have a large enough supply of brass that “running low” presents any incentive to “load now” or “load fast.”
On those occasions where I expect to expend more than 200 rounds in a session, I buy some more XM193 and, eventually, just add to my brass supply.