look at the AI Website, nothing about other calibers
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The fact they make a barrel is a function of capitalism, it's not really a factory offering only that people request it, but the AI Proper site says nothing about it is my clue, it's a case of, if company X Y and Z are making them we should too.
as noted the limitations have been spelled out. I have said over and over, my 97 AW 1.5 has been a 260 since 2007 and never pierced a primer goes against when and why they switched, cause guys making aftermarket barrels were piercing them and the pressures increased on the 6.5s but mine has never pierced a primer. The 97 AW was never advertised as a 260 and they did not make barrels. WIN Tactical Makes the barrels mainly because others do too so why not keep it in-house. Doesn't mean it's a 100% every time, it will work is a by production not an advertised feature by AI