@Supersubes that is one gorgeous rifle!
@300_BLK I do not have any experience with an 18-20" 6XC or 6CM, but I have killed scores of whitetail deer with .243 rifles with 20" barrels usuppressed.
Your suggestions will certainly do the job. The worst thing about a 18 or 20" 6mm in that category is muzzle blast, but you won't have that problem.
Good luck.