Wow, great minds think alike. I just finished sorting 4000 pieces of new Guatemalan brass. In our prairie dog squad we have several .223 rifles. The bulk of that ammo is interchangeable among those rifles. I tend to pick a good quality generic weight bullet. For the .223 that is the 55gr. Sierra SBT #1365. The brass is FL sized (ok, I can cheat just a bit, I still have a roll sizer). I load Varget, simply because its pressure curve is quite forgiving in the .223. This lets me load pretty close to max and still be safe in multiple rifles. The only other trick is to seat the bullet to Max COAL rather than matching to a particular rifle. Test for functionality and accuracy in each rifle and you are good to go. If a particular rifle don't like the load then I make minor modifications to the powder charge first. If this don't work then I try barrel dampening or weighting.
John