Bi/metal is steel jacket with gilded copper over it. The copper helps it slip through the barrel/rifling and prevents the bullet from rusting/corroding. Lead cores.
WW2 tech that still works today.
Heat and plenty of it kills barrels. Mostly.
PS, the steel the extractors are made of are way tougher than the steel cases. Think hammer vs nail.
WW2 tech that still works today.
Heat and plenty of it kills barrels. Mostly.

PS, the steel the extractors are made of are way tougher than the steel cases. Think hammer vs nail.
Comment