The standard orange tipped darts
Blue bullets are bullets are high quality Polymer Coated Lead Bullets.
Yes, may people use lead bullets for a variety of purposes.
HP ammo is not illegal in the state of California.
Yes. Lead bullets do not wear out the rifling inside the barrel as fast as steel bullets. Still, many people use steel-jacketed bullets . . .
Bullets
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.
By heating the lead into a liquid and pouring it into a mold