is steeel case ammo bad for guns
In high pressure rifles the steel cases expand especially at the neck area but not as much as brass. If you run steel cases through your dies, which don't do,you will have to use a lot force to resize them. I did some berdan primed lacquer coated cases.
Shot though ad AK47 it did still leave a bit of gunk, in the chromed chamber.
Lacquer is all that I can say it was.
The reason they chrome military chambers is for dirty, or rough ammo and coated bullets and to prevent corrosion. US doesn't use steel in our bullets, but at times did try them.
The new M855A1 rounds are hard on barrels, and chambers, extractors, bolts, and due to 65000psi operating pressures.
We don't usually seek "gunk" in M16/AR15 barrels with chromed chambers and bores though, unless you shoot the imported steel stuff.They may havee changed the coatings though.
A handgun or rifle barrel minus chrome is soft. No way would I run the steel cased stuff through a riffle or handgun. Many semi auto barrels are cheap to replace though but, extractors are a pain to replace.
The steel cases don't expand as much but they don't pop back to original spec after firing in rifles anyway. Along with soft polymer coatings they want to stick and thus you break an extractor. imo