Just my opinion, but odds are the 6mmC will come with a 1:8 or 1:7.5 twist, so IF you want to play with the high BC bullets it's a better starting point.
I'd also agree with Brad, that IF starting from scratch I'd skip the initial 4 mentioned. There's no reason not to take advantage of recent cartridge design developments, IE available match quality brass and shorter cartridges lengths to take advantage of higher BC bullets.
Well put. My wife shoots a 250AI that I had Mr Coleman put together for her graduation present. The 6.5 creedmoor was probably already introduced but I didn’t know about it if it was. She loves the gun and it’s a perfect deer rifle for her. I won’t ever change the barrel on it. If I was building the same gun today it would be a 6 or 6.5 creedmoor just so factory ammo could be used if something happened to me.
