Who’s Chambering Rifles in SAUM ?

I don't own either, but I have been debating building either a 6.5 or 7 SAUM. To those that have both or either one, is the 6.5 easier to tune than the 7 or are they both the same for accuracy? I was looking at the 6.5 to launch the 156 Berger's and the 7 for launching the 175 and 180's.
 
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