When I started reloading 5.56 I bought 1000 once-fired military Lake City brass cases. So they all needed swaging. This is the process I use and also use it for all range pickup brass. I try to collect all the brass I shoot, so I know which ones have been swaged. I have a bunch of different buckets to keep my brass straight and know which ones need what prep. I keep the Lake City brass separate because that is what I am currently using for my "precision" rounds. Misc brass and range pickups are for plinking rounds.
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Military brass, and some commercial brass, will have crimped primer pockets so the cases will need to be swaged. You only have to do this once, but it makes everything go much smoother. I do all by brass prep in one run then go back and load in a second. This is my process.
Clean
Lube
1st pass - decap/resize and swage using on the first two stations in the press.
Remove lube
Check overall length and trim or set aside long ones
2nd pass - load.
Generally I check case length and set aside the ones that are too long and put them in a bucket and will eventually trim them. For now I am just collecting the ones that are too long. Sooner or later I will buy an electric case trimmer for the 650 and trim to length in the first pass. For now I just have a contraption that attaches to a drill and will have to handle each case manually whenever I get around to it.
I bought a swage it that replaces the primer seat mechanism in the 650. So I do bulk brass prep. It only takes about 5 minutes to install/uninstall. But you obviously can't load with it in there.
https://swageit.com/swagers/dillon-xl650/
It looks like Hornady makes a swager but it works differently.
https://www.hornady.com/reloading/presses/lock-n-load-accessories/primer-pocket-swage-tool
Or you can buy a separate swager.
https://www.dillonprecision.com/super-swage-600_8_8_25263.html
I chose the swage it because it is easy enough to install and lets me use the case feeder. Since I do this in bulk, it is worth the effort to install/uninstall. I also like to do the brass prep in a separate operation because it allow me to remove the lube needed for resizing before loading and takes much less effort when loading since the cases are already resized.