Just shoot it. It will probably last a lifetime. CL barrels are really becoming obsolete. The process degrades accuracy. Hot salt bath nitride treatment is superior to CL. It is sometimes called by one of its brand names, Melonite. It is harder and more durable than chrome and does not degrade accuracy because it is not a potentially unevenly applied coating. It is a hardening of the barrel steel, itself, both inside and out, at the molecular level. It can be applied to your barrel, unlike chrome. But for civilian use your regular 4140 barrel will probably last you a lifetime. You'll never see a CL barrel on a precision rifle if the competition rules give an option. They will all be stainless, nitride, or 4140 steel.