I have the Dillon Super Swage, and I have never (repeat..., never) bought .223/5.56 brass.
When I moved up here to Central NY from Northern NJ, I was also departing my role as shooting team captain for my local Marine Corp League Detachment. The team gave me a parting gift consisting of a 5 gallon pail, mostly full, of once-fired 5.56 brass.
Since then, I have bought loaded commercial ammo and some open market MilSurp ammo; prepping and reloading after initial firing.
A large portion of the commercial ammo is actually steel cased, boxer primed TulAmmo 55gr FMJ. It reloads just like MilSurp brass, I forget whether or not the primers are crimped, the only special step requires inside neck chamfering to eliminate shaving the bullets while seating them. Up to 5 reloadings down the road, zero issues, and the cartridges use my 75gr Match load with exactly the same degree of accuracy.
Seriously, in these times; any Boxer primed brass is worth reloading except Norinco, which I have picked up at the range with split shoulders after its first firing. Thanks to a previous President's Executive Order banning ammo imports from China, we won't be seeing any of that stuff new in the foreseeable future.
Greg