Can you have a plain Jane 280 reamed out to AI without problems??
Yes, but if you want a SAAMI chamber you'll need to have the barrel set back one thread.
This is due to the fact that in order to assure proper headspace, Ackley spec'd the chambers to give a chush-fit on the standard 280 Rem cartridge. Nosler followed this spec, so the factory Nosler SAAMI chamber has the datum a bit shorter (.004" as I recall) than the 280Rem cartridge. There are many rechambered 280AI rifles (rechambered without setback) that cannot use the SAAMI 280AI brass or ammo without fireforming.
If I had a nice Kimber BGR 280Rem rifle, I would think long and hard about rechambering it to 280AI.
