I loaded a batch of 20,000 rounds in the mid 80's with WW 748 and 55 grain Win FMJBT and CCI primers on pre preped military once fired mixed brass.This was done on a Dillon 450 with the push-bar priming and powder drop. 30 years later, this same batch of ammo is down to 6500 rounds and still shoots very well in an AR and bolt guns. AR-15: 5 shots, 100 yards = .250" centers. 2 different Cooper 21 bolt actions: 5 shots, 100 yards = a single hole! all guns on good rests and 20 power scopes.
I have varmint loads using H335 with Federal 205 primers and highly recommend it.
The dies I used for the large batch were RCBS small base dies. If I was buying now I would buy RCBS balck box AR dies (carbide) or Dillon's carbide dies. You still need to lube a little bit at the shoulder, but with Imperial Sizing Wax, it is about every 3rd or 4th case. With steel dies I would a spray lube in a bucket with 100-150 cases and shake it around while it is still wet (that is what I did on the big batch, using a different lube.
De-prime and swadge primer crimps before running through your 550. I tumbled in between these stages, but cleaning isn't absolutely necessary. If you are roll crimping you should trim to length in there some place too (I do that after cleaning and sizing FL), but depending on the type of firearm used tape crimp or tight neck tension could be all you need (then trimming isn't as critical).
IMR 3031 and Varget are both fantastic powders for 223, but to get good accuracy/consistency each charge should weighed (I do this on my 1000 yard bolt action loads.) I have not used CFE 223, but have 3 friends ( good shooters) who recommend it.
Have fun, and feel free to PM me if you need any clarification or just have questions. Ivan