"...The thin layer of heat treat is for wear resistance and corrosion resistance ..." "heat treat", does not always mean case hardening. Sometimes, (frequently, more often), it means through hardening (and drawing).
Sometimes you get what you pay for, sometimes you only pay more for what you get.
Three shots are not a "group"...they are a "few".
If the Bible is the literal, infallible, unerring word of God...where are all those witches I am supposed to kill?