Because it is heavy (retains energy for greater distance), soft (fits itself to the barrel of the gun) and cheap.
Copper, Lead
Lead is used to make various products such as batteries, radiation shields, and bullets. Additionally, lead is used in the manufacturing of certain types of glass and as a stabilizer in PVC plastics.
Bullets and ammunitions
Lead
Bullets are typically made of lead, although some modern bullets may use alternative materials such as copper or steel. Lead has been traditionally used due to its density, which allows for better accuracy and stopping power.
Blue bullets are bullets are high quality Polymer Coated Lead Bullets.
No. They are metallic lead, usually alloyed with tin and antimony.
Yes, may people use lead bullets for a variety of purposes.
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 . . .
Lead is commonly used to make objects such as batteries, radiation shielding, bullets, and fishing weights.
Steel shot bullets were first used in the late 19th century as an alternative to lead ammunition. Steel shot gained popularity for its environmental benefits and is commonly used in hunting waterfowl to comply with regulations on lead toxicity.