this is a rather pointless statement - see above the PRS standings i posted.
6BR, 6GT, 6 Dasher, then 6BRX, 6 BRA - choose whatever you like. I really like my 6.5CM rifle, it is great. but i need a rather significant supply of reloder16 for my optimal loads there and i did not see it lately, nowhere at all - and it takes 41.8gr of R16 for my load there. 166 rounds from a pound of powder.
6 dasher is usually going at 32.5gr of varget, and to load 6GT or Dasher i then going to use same Varget i have stocked up and need for my .223 69gr loads - and having same powder for both would simplify the deal a ton.
shooting wise, again, it is all the same. no benefit at all. even barrel use wise - 6.5cm will wear really comparable to 6 dasher or 6 gt.