What Is Bi Metal Jacketed Ammo?

Bi-metal jackets are made from very soft mild steel. Bores/barrels are at least as hard as tool steel and when chrome plated are even harder. Steel jacketed bullets are nothing new. The US had steel jacketed bullets in WWII chambered in 30-06 and 45 ACP.

Is bimetal ammo bad?

In short, bi-metal bullets do not do any more damage to your firearms than conventional copper jacketed rounds do. All the claims of chamber wear, throat erosion and barrel wear are unsubstantiated wives tales.

What does jacketed mean in ammo?

A Full Metal Jacket (FMJ) is a bullet that has a soft core, usually with lead, and is encased in a harder alloy metal such as cupronickel or gilding metal. The purpose of these rounds is to hold their trajectory, and they have greater penetration against soft tissue.