That expert if full of crap (FOC). Is he trying to say that the bullet was not fired from the Browning because it did not have any nickle on the bullet from the nickle steel barrel? Since lead is far softer than the nickle steel the lead gets deposited on the bore not the bullet wearing out the steel barrel. We call it lead fouling.
Most .22 bullets are plain lead or washed with copper or copper jacked in a very thin layer of copper. Perhaps some where they make .22 bullets with nickle plating but I have not seen any. Some cases have been plated with nickle but that is on the outside of the case, not the inside which comes into contact with the bullet. Again where is he claiming the nickle to be coming from? Out of the steel, off the case exterior or from a unheard of nickle plated bullet? The Lone Ranger used a silver bullet not a nickle bullet. FOC
