No problem.
People often assume new is better (ie 6.5 CM) or that there are big differences. 6.5x47, .260, 6.5 CM are all very close. The 6.5x47 is down a little on velocity. The other two have logistical/availability tradeoffs. There's nothing wrong with .260 other than Remington's lack of marketing and their factory brass is variable. But those two aspects are pretty much irrelevant to our use, since we don't need marketing and we can use other much better brass.
best
Zak
