the 6xc seems like a speed demon with accuracy and I think it seems like a nice round so I may build a new rifle in 6xc but do not have a clue where to buy brass all I know is tubb made it and norma makes it also.
Also consider a 6x47 Lapua, 6mm creed, 243 and 6mm Super.
Of these, I consider the 243 and Super ideal choices because of such easy brass availability, and sufficient case capacity to run 115s or 105s to ~3100fps with H1000…