The article is entitled "The amazing 6.5 Gibbs" written by daryl cassel ran in the jan 1996 issue of "The Varmint Hunter" mag. If its not online I could scan my copy and send it to ya via email.
moving the shoulder foreward gives the case an addional 8-10 grains powder capacity over the standard case, not sure what the standard AI treatment gives it.
RR

If your going through hell, keep on going, don't look back, If your scared don't show it.
You might get out b'fore the devil even knows your there.
(Rodney Atkins)