Is there any good reason to continue shooting CNL cartridges in my 1923 Colt .38 cal. Army Special with a two inch barrel? The gun was a family members home defender and came with several boxes of CNL ammo. I thought about switching to FMJ cartridges in order to keep lead out of the shooting range’s berm, but I will shoot the CNLs if there’s a good reason to continue, i.e. age of the gun, etc. The gun is in good condition for it’s age (95 years old). The bore is clean although the rifling looks a little faint. It shoots the CNL ammo OK. I’m on human-size paper targets at 25 yards.