Understand Bullet Construction

Understand Bullet Construction

Bullet construction is an often-overlooked aspect of a shooting system. Whether you’re looking to reload or buy off the shelf, “How far does it need to go, and what does it need to do when it gets there?” is the question you should be asking.

Pairing the proper bullet to the application is critical to success. Getting this wrong can lead to poor accuracy, unrecovered game, or catastrophic projectile failure. To get this right, you will need to know some basic bullet anatomy terms, as well as what the different categories of projectiles are designed for.

Common Terminology

Jacket: This is the material covering the exterior of the bullet. It protects the barrel and the bullet during flight.

Core: This makes up the bulk of the bullet’s mass. Typically made of lead, the core is the payload that the jacket is delivering.

Tail: The rear of the bullet, either flat or “boat tail,” meaning a slight taper designed to reduce drag in flight.

Bonding: The process of mating the jacket to the core for controlled expansion and weight retention.

Bearing Surface: The parallel section of the bullet that contacts the inside of the case and the lands of the rifling.

Ogive: This is where the bullet tapers down toward the tip. The shape of the bullet’s ogive makes a massive difference in its ballistic coefficient (BC), as well as its overall length.

Meplat/Tip: The first part of the bullet to contact both the air and the target. It also plays a large role in controlling the center of mass. Tip design is a large factor in a bullet’s intended use. While “tip” is the more common term used, “meplat” is still found in some manuals, so it is important to know the term.

Now that we have established bullet anatomy, we can discuss the different types and their intended purposes.

Bonded Hunting

This is the widest category. Bonded hunting bullets are characterized by a bonded jacket and core designed to retain weight on impact and produce repeatable, reliable results on game. These bullets prioritize terminal, or post-impact, performance over everything else. Flight characteristics are secondary at best.

These bullets will vary based on their intended use. It is important to research and tailor your bullet to your desired game and outcome. Soft-nose, hollow-point, or ballistic-tip bullets are commonly used for medium to large animals. Hard-cast bullets are used for larger, dangerous game with thick hides and a propensity to present frontal shots.

Varmint Rounds

Sometimes referred to as “cup and core” due to the exposed lead base, these bullets are designed to fly fast and stop fast. Since the target species for these bullets are small, fast-moving, and often difficult to range, you need a bullet with a long “maximum point-blank range,” or the distance at which you can hit your target without adjusting for bullet drop.

This is accomplished by using light-for-caliber bullets with a flat base, short bearing surface, and open or soft varmint tip. It is also common for these bullets to have thin jackets and non-bonded cores, as penetration is not as important as bullet expansion.

This results in screaming-fast muzzle velocities. These bullets rapidly deconstruct upon impact with a soft target, making them excellent for depositing maximum energy into small, thin-skinned animals.

The downside is that the lightweight, less-aerodynamic design results in a lower ballistic coefficient. As a result, velocity drops off quickly after a few hundred yards. Their tendency to rapidly deconstruct upon contact also makes them less than ideal for penetrating heavier game.

Match

This category is for when extreme ballistics are everything. These are long, heavy, sleek bullets designed to achieve maximum ballistic coefficient.

Unlike hunting bullets, these often have little to no consideration given to terminal ballistics. They are typically boat-tailed, with a long bearing surface and ogive designed to cut through the air.

It is also common for these bullets to have a hollow tip. However, this is not necessarily for expansion. Instead, the hollow tip can help move the center of gravity rearward, improving stability.

These bullets are appearing more often on sporting-goods-store shelves, but it is not advised, and may even be irresponsible, to hunt with them. Their aerodynamic design and non-bonded cores can produce poor results on game, either showing little to no expansion or fragmenting into pieces. Both outcomes can lead to wounded or unrecovered game.

You will hear some people talk about bullet fragmentation as a positive thing. While you may get lucky and hit something vital, there is no way to ensure consistent performance. It is best to keep these bullets on the competition field.

Hybrids

These are a mix of hunting and match bullets. They were driven by the need for tactical applications to have a bullet that could shoot extreme distances and then perform effectively on impact.

These bullets look like match bullets on the outside and boast impressive BCs, bonded cores, and a tip designed for both flight characteristics and controlled expansion.

While these bullets are an impressive advancement for long-range hunting, they are not for every application. Inside of 300 yards, you may not reap the benefits they offer.

Secondly, because of their longer overall length, they can have some loading and chambering issues if you have an older rifle or one that is not designed for longer overall cartridge lengths.

Monolithic

Made from a single material, typically copper, these can also be referred to as “non-toxic” because they contain no lead. Monolithic bullets can be included in any of the previous categories, depending on their construction. They come in solid, expanding, and fragmenting designs for different applications.

These bullets offer excellent expansion and weight retention. However, they need sufficient velocity to work correctly and do not perform as well at low velocities. It is important to factor that into your maximum effective range.

Copper is also less dense than lead, so these bullets typically come in at a lower grain weight than their lead counterparts. This can affect both velocity and BC.

With more states looking to mandate non-toxic hunting ammunition, these bullets will likely become more popular in the future.

Putting it all Together

Now that you have the terminology and understand the different types of bullets, you can work backward from your intended target to produce the best possible outcome in the field.