longcruise
70 Cal.
With all due respect running a rod only seven inches isn't the same as running a rod down the full length of a barrel where the rod can bend and rub against the inside of the barrel. If you recall in our history books people use to think the world was flat?
Well, consider that the exposure was very long term in times of quantity. Thirty thousand strokes! Deliberately focused on the area that seems to be the focus of concern; the muzzle. Consider which material did the most damage.
They ran their machine long enough to produce about 30,000 strokes and were quite surprised to find that the only material that actually wore the muzzle was the stainless rod which looked somewhat polished when the tests were finished. The bore that had been tested with the stainless "ramrod" was badly worn.
So, whatever testing and evidence that you are familiar with would be of interest.