Why would I PAY you for brass when I can get used brass for lots less, especially when I buy in bulk. My last buy of used brass was 5000 for $200 and most of it was commercial. I was offering to pick up the "garbage" federal brass he did not seem to want.
It was your suggestion and surely you didn't expect something for nothing did you? I notice you don't offer any useful info on where the rest of us can get cheap brass so I must assume it is only a private thing that is therefore of no value to anyone else.
I will state it again, IF you are getting enlarged primer pockets with current federal .223 brass, your load is WAY over book (read safe) load or your chamber is WAY oversized (read "field guage" or +). I have 1000s of .223 and 5.56 brass loaded into factory and wildcat loads including .17 Rem, .223, 6TCU, 6.5TCU, and 7TCU. Maybe a 1000 or more are federal cases. Some fired up to 10x. I have NEVER stretched a primer pocket.
If you are stretching primer pockets, you are reaching UNSAFE pressures and should immediately stop before you and/or someone next to you gets hurt.
And yet again you are making false assumptions. The statements I've made here concerning Federal brass for use in handloading for ARs, which BTW is the OPs original concern, are quite common results obtained by those of us who actually load for and shoot ARs in volume. It is also common knowledge that commercial brass used in ARs is not a good idea. The majority of actual AR users use LC strictly because of availability even though some of us will occasionally use RORG, Privi and even Guat with their tiny flash holes but I know of no one who uses commercial regularly.
Primer pocket expansion in Federal brass for this application has been well known for a long time and has been attributed by many to nothing more than an anomaly of either the material used or something in the manufacturing process itself which is singular to this manufacturer and their procedures. I've never heard a definitive explanation but merely seen the results.
BTW Steve use of military brass in some of the rounds you mention like the TCUs I use in the Contender offers another whole group of challenges good for a different thread as this one was originally concerned with 5.56/223 in an AR. With the absorption of Cobb Industries and the lack of interest shown their competitors I'm unaware of anyone offering such rounds on the AR platform at this time.
I'm still using .44 Magnum cases from RP and WW that have been loaded well over 50 times and perhaps over 100 times and they seem to work just fine.
I have similar straight wall pistol cases myself, but there again it is for use in a totally different platform and under different conditions.