Our 22 Creedmoor is loaded to fit in rifles running the standard 0.081″ freebore or longer. We suggest the 75gr Hornady ELD-M as the ideal projectile for this caliber, If you choose to run the 88gr Hornady, 90gr Hornady, Sierra or Berger, or the 95gr Sierra PLEASE note your rifle ideally should have a freebore of .120″ or more. But, again, All our ammunition is designed for the 0.081″ freebore.
Barrels with a tight bore are NOT RECOMMENDED!
Regarding Small Rifle Primers or Large Rifle Primers, Always go Large Rifles Primers unless you specifically know your rifle was built using a small or bushed firing pin to avoid issues. You can read more here: Small vs Large Rifle Primers