Most bullets are made from lead. Some will have copper jackets around them, but the bullet itself will be lead.
Yes, some still do. The actual bullet is made of lead.
Lead is too soft to use in a gun. However some bullets are made with Lead.
lead.
Usually they aren't. Lead, or lead in a copper shell (a "jacket") is the most common choice for bullets. Bullets CAN be made of mild steel, usually also copper jacketed, and it's usually done because of concerns about the lead from the bullets causing pollution. Mild steel is one of the less expensive replacement options for lead in bullets.
Bullets can be made from many materials including wood, steel brass, copper, lead, tungsten, bronze, plastic, etc.
Lead, with a copper jacketing.
Availablity, Cost, and Density.
lead, copper, steel
Most are. A very few have no lead, but most bullets ARE lead, or lead combined with other metals. A few have been made of plastic, wood, wax, copper, steel and even powdered iron.
The same thing 9mm bullets are made of, and 7.62x39 bullets, and... well, bullets in general. The case can either be brass or steel. The projectile will primarily be lead. It may have some other type of metal inserted into it, and may or may not be jacketed with copper.
bbs are made out of steel and pellets are made out of lead