A better question would be which do NOT have lead. A small percentage of rifle and handgun bullets are solid copper, bismuth, or some non-lead metal. Shotshells used for waterfowl are loaded with non-lead shot- steel, bismuth, or iron/tungsten alloys. But MOST bullets are still lead. It may be covered by a gilding metal jacket, but it is there.
Yes. Lead bullets do not wear out the rifling inside the barrel as fast as steel bullets. Still, many people use steel-jacketed bullets . . .
Yes, some still do. The actual bullet is made of lead.
in some cases people still use led bullets for warfare or hunting.
Blue bullets are bullets are high quality Polymer Coated Lead Bullets.
Yes, may people use lead bullets for a variety of purposes.
Bullets
I think most bullets have always been made, principally, of lead. Lead is soft, heavy & easy to mould or cast. In the times of Musketry bullets were spherical, rifling improved their ballistic qualities and they became pointed cylindrical in shape. Nowadays they are coated in copper, but lead is still their principal metal.
Bullets can be made from many materials including wood, steel brass, copper, lead, tungsten, bronze, plastic, etc.
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.
Normally - lead.
About 99%. Lead is an inexpensive metal that is soft and dense- 3 criteria for bullets. Most will be made of lead- if not entirely, they will have a lead core covered by another metal, such as copper.
Most bullets are made from lead. Some will have copper jackets around them, but the bullet itself will be lead.