YOU CAN BUY A DELRIN MUZZLE PROTECTOR FOR ANY CLEANING ROD FROM MOST SUPPLIERS. The reason to use a hickory cleaning rod in the gun is because it is both traditional( you expected something else on this forum?) and wood does not damage the barrel or muzzle, UNLESS you leave it dirty and allow grit to imbed into the wood. The silicon grit WILL damage the muzzle over time.
The old, 19th and 18th century barrels that you see with the worn muzzles are almost always made of soft iron, and not steel. Steel does resist wear much better, but noting can resist hard silicates working on them like sand paper over time. I have seen some shooters putting dirty ramrods back in the ferrules of their rifles, and never cleaning the rods. ( I have checked the guns before they started shooting the next time they get out to the range.) I guess they think their hands will get dirty( ier) if they clean rod. But, then, they don't exactly clean the gun very well, either. About a year after they begin, the gun starts having hickups, and they start complaining about how the gun just doesn't shoot any more. When you check the guns, you can see what neglect does to a fine gun. Clean the gun, and clean the rod after each use. Cleaning patches are a lot cheaper than a new barrel.