Once Nosler standardized the 280AI (although they screwed it up) and SAAMI accepted those dimensions, a gunsmith is sort of obligated to chamber to those specs. This may result in excessive head clearance if one tries to fireform standard 280 but there you have it. A chamber which is properly reamed to fireform factory 280 will probably not accept the Nosler 280AI. So, which is the real AI? I have decided to simply not chamber them anymore unless I do the thirty degree version.
Tikka boom, the disparity in dies is just another part of why it turned into such a mess.
It is difficult to imagine how Nosler managed to screw up when it was a simple calculation but they did it. Leeper
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