I've reloaded 45 and 9mm ammo in steel. It does work harden faster than brass but you can do it a time or two. I've not done rifle in steel yet - but would not hesitate to do it. Might be a good thing for shoots where the brass is lost - like patrol shoots -
Matches in primers is an old one. Indians, during the indian wars, could not get ammo and reloaded their own. Often taking the shells found on dead troopers apart and splitting the powder to get two rounds out of one. They would get the heads of matches wet and make a soup - then put it in the primer cups and just priot to hardening push the anvil in.
I have seen that trick done on 45-70 cartridges.
