When I got my Kimber 280 Ackley this Feb I picked up 250 rounds of Nosler 280AI brass and then backordered another 250 rounds from Midway. Sat in backorder status for months and was not available from other on-line suppliers or Nosler.
Finally found a box of 50 more Nosler AI brass on a shelf when I was on a trip so I picked that up as well.
In July I cancelled the backorder and picked up 100 rounds of Nosler 280 Remington brass and 100 rounds of Hornady 280 Remington brass and fire formed them.
Because the Nosler 280 Ackley SAAMI chamber is very slightly shorter than the original P.O. Ackley 280 AI wildcat chamber, I was getting a good "crush fit" and did not have to worry about creating a false shoulder or seat into the lands. Both the Nosler and Hornady 280 Rem brass fire formed very well with sharp shoulders/no web stretch using standard 280 Remington loads.
I now have my 500 cases and will not worry about brass for quite a while.
Barstooler
