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I've got a 6mm Creedmoor and it's a fine cartridge.

Last year I started doing some precision loading for the 223, and wow! Using 77 grain OTM Berger bullets several of us had no problems shooting tight groups with it. Great bullet! Requires a 1:8 twist barrel.

For what you're describing, I'd opt for the 223 as it's less expensive to shoot and capable of fine accuracy. To me the 6's shine as the distance increases, even then I've seen 223's doing great at 600 yards.

Regards, Guy