I have been using brass jags for many years. I am looking at polymer, nickel plated and aluminum jags for copper solvent ammonia based cleaners such as wipe out patch out and foaming solution. The brass jags will give a false positive indication on copper fouling, BUT, are the polymer and aluminum jags too hard or soft that they would harm the bore or too soft and pick up debris and act like sand paper? Will the aluminum mar? Also, clean from the muzzle or the breach? I used a coated Dewey rod and most all of my rifles are stainless.