The wool is approx same hardness as barrel or softer.... and it is a soft backed abrasive
Eg.. put abrasive compound on a soft cotton cloth and abrasive on a oak wooden dowel ( compare which abrades faster )
The soft back abrasive is way less aggressive
The steel wool just abrades at a very very slow pace if at all.... however it is harder than iron oxide and will remove this
.. another is pumice powder 4f will remove rust ..if used with a soft cotton cloth, wont be too aggressive
The problem with trying to correct a wonky chamber with steel wool is it 'polishes' all the 'ridges and valleys' equally... not just removing ridges...
It definatly got rid of some tooling marks.I fail to understand how 0000 steel wool can polish a rough chamber as rubbing it on bluing for a long time has no effect on the bluing...
I think the long use of spinning 0000 steel wool in your chamber cleaned your dirty chamber...
you can make a flapper with a wood dowel with a slot in it and 600wet dry paper, works good for cleaning up a chamber