Birchwood Casey makes a product it calls Aluminum Black, or something very close to that. It will darken any aluminum well enough for your purposes, but it will also rub off in time. I have used the product, and short of painting it, or having the rod coated with some of the hot products, I don't know anything else that works as well.
I still would recommend using a 1/2" or 9/16" Hickory Rod with the gun. I would open up that ramrod hole in the stock to take the larger rod size. I would also not hesitate to remove those pIpes, and replace them wit correctly sized ones.
Finally, I decided to remove the inadequate pipes and terrible run-out grained wood ramrod that came with my shotgun. Instead of sticking a new set of pipes( mine screw on) and buying a new rod, I made a hickory range rod out of 1/2 or 9/16" straight grained rod. I put a "doorknob" handle on it, made of walnut, which I turned down on a friend's wood lathe. Brass ferrule, and loading jag on the other end.
I carry the rod in the field with me, slide down the middle of my back, under the trap for my hunting bag, with the jag stuck behind my belt, and the doorknob waving above my head. If I leave a field and enter woods, It takes NO effort to simply reach up, grab the rod, and pull it out to carry along the barrels of my DBL shotgun as I negotiate trees and brush.
I am doing the same thing with an Aluminum alloy Range Rod for my fowler, and find no problems carrying it into the field at all. If a target appears suddenly, and I happen to be carrying it with my gun in my hands, I simple drop the rod to the ground where I am standing, mount the gun to my shoulder, and take the shot. The rod has always remained there at my feet until I pick it back up to clean and reload. My rod has a satin finish which does not reflect light well at all- NO flash. Its from ProShot. For that reason, I have not seen a good reason to apply the aluminum black I have to the rod.
As for my smoothbores, and those missing rods, I really don't miss them at all.
I certainly understand your desire to have a strong rod for seating large bullets in a .58. A Stainless Steel, Brass, or Aluminum Alloy rod fits the bill, but so do good properly sized Hickory rods.
Oh, my hickory rod for my .50 caliber rifle was made from a 3/8" hickory rod, but the last 4-6 inches were tapered by my gunsmith so that the end could fit UNDER the forward lock bolt on my flintlock action. Since I load using a Hand-Over-Hand method, never putting my upper hand more than 8 inches above the muzzle, I find no problem using that rod to load tight PRBs down the GM barrel.
I never recommend grabbing any rod- wood or metal-- at the end with the idea that because its strong, and I am STRONGER, I can run that tight Ball or Bullet down with one BIG STROKE. :nono: :shake: :shocked2: :youcrazy:
That is the way rods are broken and bent, and people find their forearms, wrists, and hands pierced by the broken ends of these rod. Its painful, and bloody, and suspends any idea you have of hunting, while you locate the nearest emergency room to get yourself patched up! :shocked2:
:barf: :idunno: :surrender:
When someone complains of any rod being inadequate to seat a ball or bullet, I want to know: What size bore, ball and patch are involved, and What Kind of Loading Technique they are using! :shocked2:
The last item of importance is the diameter of the rod involved. :hmm: :hmm: :v :thumbsup:
The steel rods I have on several Military bolt action rifles, of different calibers, from .264" up to .458" are all made with 1/4" or smaller diameter rods. Because the rods are steel, they don't need to be thicker, nor heavier. But, they are also flexible, and can be bent, putting them out of commission, If Used Wrong. :hmm: :hatsoff:
The Hand-Over-Hand technique has been taught to new recruits for many years- centuries- to prevent just this kind of thing from happening in the field of battle. :hmm:
Before you change something, find out why its the way it was made. There may be a good reason for it to have that tapered end, and there may not be enough room at the back of the barrel, and the front of your lock for you to enlarge that ramrod hole. :idunno: :hmm: :thumbsup: