Fast,
I'd call Redding and pose the question to them, but do some more reading before you do.
I did some reading on the subject last year when I was trying to choose between 280AI and a 7MM WSM and the last thing I read indicated that the initial confusion re' whether there is a difference between "2 versions" has now been solved. Apparently it was a matter of the reamer prints on the two had an APPARENT difference in headspace (base to shoulder), but it was later determined that they were the same - it's just that the measurement across the datum of the shoulder was taken at a different point on the shoulder on one print and the measurement was missing on the other one. At least that's the way I understood it.
Anyway, I went with the 7mm WSM so I quit studying it.
Here's a link for Redding part numbers: http://www.redding-reloading.com/ima...ng_catalog.pdf
Elkbane
There are some other anomolies between the 280AI and 280Rem cartridge diagrams - the diameter at web on 280R is .47 and 280AI its .4685. If you ignore this and assume they are really the same, the difference in case volume between 280AI and r80Rem, from base to shoulder/neck junction (the usable portion of the case) is 3.7%. based on outside diameters. If brass thickness is the same for the two, the inside case volume should differ by the same amount. SAAMI doesn't publish case volume....
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