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Most tips are made of polyoxymethylene, although some manufacturers have used polyester urethane-methylenebis(phenylisocyanate) copolymer. Upon impact, the plastic drives into the hollow point and the bullet performs like a standard hollow-point, expanding ("mushrooming") to a larger diameter.

Unlike jacketed hollow point bullets (JHP), monolithic bullets do not have a jacket, cup, core, or tip. They are instead a solid material, typically copper or a copper-zinc brass alloy, although historically any bullet made of a single type of metal can be referred to as a monolithic bullet.

The majority of the embodied energy in a 9mm cartridge is from the combined mining and processing of the metals – primarily lead, zinc, and copper. For the purposes 9mm manufacturing, the lead is usually formed by into spools of long wire by extrusion with its diameter close to the 9mm.

Even though the heavier bullet starts out slower it doesn't always slow down as quickly so that the flight time stays very nearly the same. As a result the bullet drop is very nearly the same. All of this tells me that sorting bullets ing to weight is a waste of time – except for one thing.

Bullets may be made of a variety of materials, including metal, plastic or rubber. Bullets for hunting and target shooting typically are made of lead or may have a lead core with a copper coating, and may include inserts made of plastic or other materials. Caliber is the measure of the outside diameter of the bullet.

Most bullets still use lead alloys, The “green" rounds use steel, bismuth, tungsten, and other exotic bullet alloys, still with copper jackets. Be careful with the bismuth ammo, as bismuth-212 is radioactive.