The Creed has the better shoulder angle of 30deg and this helps in 2 ways, better burning of the slower powders and reduction in case stretch. The AI generally has 40deg shoulder and aids these points as well. You will find most target intended designs have the 30deg shoulder. Before the Creed made an appearance on the scene I organised a reamer from the US for a 260 30Deg Improved, i've been using this a while now and won't be changing. The Creed is essentially a 3mm shorter version of my 260Imp. I run mine in a T3 action with long mag and a long throat for the 143-147 bullets and I built it for long range shooting, both hunting and gongs.
If I wanted a 6.5 in a dedicated medium action with no mucking around I'd go the Creed, for the better case design.
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