When I'm doing large lots of .223 or 45acp, I use the 100 count primer sleeves to break them into smaller lots if I have to as I empty them.
Got a medium flat rate box of LC .223 brass to turn into 300BO for my new carbine upper. Was going to make the cutting jig on the mill (and still may) but I decided to try one of the 3D printed ones for $12 to my door first. Looking into getting a muffler for it as well. Wow, is that whole process and extraordinary cost frustrating. To think that the Europeans are ahead of us in the promotion of suppressors as safety devices is baffling. I think they should be issued with every purchase, just like they do with trigger locks in some areas.