ALCO Bullet Talk #5
IT ALL STARTS AT THE CORE
The bullet shown here is where ALCO’s big bore airgun slug story began. During the development of the Umarex Hammer, ALCO worked closely with Umarex to engineer the projectile they envisioned for their new platform. Through extensive testing, the 350-Grain Hollow Point became the benchmark for what would eventually grow into ALCO’s entire .510 hunting lineup.
Its combination of accuracy, dependable expansion, retained energy, and practical hunting performance established the design philosophy that continues to guide our big bore airgun slugs today.
From feral hogs and whitetail deer to massive water buffalo, the 350-Grain Hollow Point has earned a reputation as one of ALCO’s most trusted hunting slugs. Its success confirmed something we had believed for years:
Great performance starts at the core.
At ALCO, precision-swaged lead cores have always been a fundamental part of our business. Long before we manufactured big bore airgun slugs, we were producing precision-swaged lead cores for our jacketed rifle bullets. That experience taught us an important lesson: consistency starts at the center.
When we designed our airgun slug lineup, choosing 100% soft lead wasn’t simply a material decision. It was the natural extension of decades of manufacturing precision projectiles.
The Research & Development team at Umarex was developing a new .50 caliber PCP air rifle that had not yet been introduced to the public. They were looking for a company to help engineer a projectile specifically for the new platform, and they asked ALCO to become part of the development process.
We accepted the challenge.
Over the next two to three years, we worked alongside the Umarex engineering team as both the rifle and the projectile evolved together. Prototype after prototype was designed, tested, measured, refined, and tested again. Long before shooters knew the rifle as the Umarex Hammer, we learned lessons that would shape every ALCO big bore airgun slug that followed.
One lesson became impossible to ignore.
The material inside the slug was just as important as its design.
Fortunately, that wasn’t new territory for us.
Precision-swaged lead cores had always been a fundamental part of ALCO’s business. Long before we manufactured big bore airgun slugs, we were producing precision-swaged lead cores for our jacketed rifle bullets. Years of experience had taught us an important lesson:
Consistency starts at the center.
When it came time to finalize the projectile for the new Hammer, we already knew what material we wanted to use. The answer wasn’t a harder alloy—it was precision-swaged 100% soft lead.
That decision became the foundation of ALCO’s big bore airgun slug line and remains at the core of every airgun slug—and every precision rifle bullet—we manufacture today.
That experience established a philosophy we still follow today: Every ALCO airgun projectile begins with a precision-swaged 100% soft lead body. Our ULD models then incorporate a precision-engineered metal tip to improve aerodynamic performance while retaining the advantages of a soft lead projectile.
Airguns Are Engineered Differently
One of the biggest misconceptions in the shooting world is assuming that an airgun slug should be built like a centerfire rifle bullet.
While they may appear similar, they operate under completely different conditions.
A centerfire rifle launches a bullet using rapidly expanding gases produced by burning powder. Chamber pressures can exceed 60,000 PSI, and velocities often reach well over 2,500 feet per second.
Big bore PCP air rifles work very differently.
Instead of burning powder, they use carefully controlled compressed air to propel the projectile. Most operate at subsonic velocities, making efficiency and consistency far more important than raw speed.
Those differences change nearly every aspect of projectile design—including the material used to manufacture the slug.
Why ALCO Uses 100% Soft Lead
Soft lead provides several important advantages for modern big bore airgun slugs. A precision-swaged body made from 100% soft lead is well suited to modern PCP airgun velocities. When combined with a properly engineered hollow point or meplat, soft lead can deform more readily than hardened alloys under appropriate impact conditions. That controlled deformation helps transfer energy efficiently while maintaining accuracy and consistency shooters expect from a precision-engineered projectile.
As the slug begins moving down the barrel, the lead conforms to the rifling and creates an excellent seal. That efficient seal helps maximize the energy produced by the compressed air while promoting consistent engagement with the rifling from shot to shot.
For precision shooters, consistency is everything.
If every slug leaves the barrel under nearly identical conditions, groups become smaller, trajectories become more predictable, and confidence grows with every shot.
That’s one reason ALCO continues to manufacture precision airgun slugs from 100% soft lead rather than hardened alloys.
The goal isn’t simply to build a slug.
The goal is to build the most accurate slug possible.
Why We Precision Swage
Material is only part of the story.
Manufacturing matters just as much.
Every ALCO airgun slug is precision swaged, not cast.
Casting has produced quality projectiles for generations, but it relies on molten lead filling a mold and cooling into its final shape.
Swaging is a completely different process.
Each slug is formed under tremendous pressure inside precision dies from carefully controlled lead wire. This produces exceptional consistency in weight, diameter, bearing surface, and overall dimensions.
That level of uniformity is one of the reasons competitive shooters have trusted swaged projectiles for decades.
At ALCO, we carried that same philosophy from our precision rifle bullets into our airgun slug program.
Accuracy starts long before the trigger is pulled. Precision manufacturing gives a projectile the consistency needed for accuracy. But accuracy is only part of the equation. Once the slug reaches its target, material selection becomes equally important.
It starts with manufacturing every projectile as consistently as possible.
Why Hunters Choose Soft Lead
Terminal ballistics describes what happens when a projectile reaches its target. While accuracy determines whether you hit your mark, terminal performance determines how effectively the projectile transfers its energy after impact.
Modern big bore PCP air rifles operate at subsonic velocities, so they cannot rely on extreme speed alone to produce effective results. Instead, they depend on efficient projectile design, proper shot placement, and intelligent use of the energy carried to the target.
That’s where material selection becomes critical.
A precision-swaged body made from 100% soft lead is well suited to modern airgun velocities. When combined with a properly engineered hollow point or meplat, soft lead can deform more readily than hardened alloys under appropriate impact conditions. That controlled deformation helps transfer energy efficiently while maintaining the characteristics that make big bore airguns effective hunting tools.
At ALCO, however, terminal performance is never considered by itself. A projectile must first reach its target accurately before terminal performance matters. That’s why every airgun slug begins with precision manufacturing. Consistent weight, precise diameter, and uniform geometry help produce repeatable flight characteristics from shot to shot.
In other words, accuracy comes first. Terminal performance follows.
That philosophy is one reason ALCO continues to manufacture every airgun slug with a precision-swaged 100% soft lead body. The material was selected not because it was the easiest choice, but because years of development showed it offered the right combination of barrel seal, manufacturing consistency, aerodynamic stability, and dependable terminal performance for today’s big bore PCP air rifles.
Built for Subsonic Performance
Modern PCP air rifles are remarkably capable hunting and target platforms, but they achieve their performance differently than centerfire rifles.
Instead of relying on extreme velocity, they depend on efficient projectile design.
Soft lead complements that design philosophy.
When paired with a properly engineered hollow point or aerodynamic profile, soft lead allows the projectile to perform effectively at typical airgun velocities while maintaining the accuracy needed for ethical hunting and precision shooting.
Rather than chasing speed alone, ALCO engineers every slug to maximize efficiency throughout the entire flight of the projectile.
Different Platforms. Different Engineering.
Our precision rifle bullets use copper jackets surrounding carefully swaged lead cores because rifle bullets operate in an entirely different pressure and velocity environment.
Our airgun slugs do not require a copper jacket.
They require a material optimized for the unique demands of compressed-air propulsion.
Different platforms require different engineering solutions.
That understanding became one of the most valuable lessons we learned during the development of our first .510 airgun slug.
Our Core Philosophy Continues Today
Today, ALCO manufactures a growing line of big bore airgun slugs, including .308, .357, .452, .457, and .510 caliber projectiles for target shooting and hunting.
Although the lineup has expanded considerably since those early development days, the philosophy remains unchanged.
Every slug begins with precision manufacturing.
Every slug begins with consistency.
And every slug begins with 100% soft, precision-swaged lead because we believe the best airgun projectiles are engineered specifically for the platform they are designed to shoot.
The .510 350-Grain Hollow Point may have been the bullet that started ALCO’s big bore airgun program, but the lessons learned during its development continue to guide every projectile we manufacture today.
Although the platform was new to us, our approach wasn’t. Years spent manufacturing Today, ALCO manufactures a complete line of precision big bore airgun slugs in multiple calibers, but every one of them can trace its design philosophy back to that first development program. The names and calibers have grown, but the guiding principles remain unchanged: precision manufacturing, consistency, and 100% soft swaged lead engineered for modern PCP air rifles.
Every ALCO Bullet Talk article is written to help shooters better understand projectile design, long-range performance, precision rifle bullets, and big bore airgun technology.
Explore more articles on the All About Bullets blog at ALCOBullets.com and discover the engineering behind the precision rifle bullets and big bore airgun slugs trusted by shooters who demand accuracy.
Explore the ALCO Airgun Slug Lineup
The engineering principles discussed in this article are applied throughout the ALCO airgun slug lineup. Whether you’re looking for long-range target performance, dependable hunting performance, or magazine-compatible airgun slugs, every ALCO projectile is engineered for a specific purpose.
.308 Airgun– Ultra-Low Drag (ULD) steel-tip airgun slugs engineered for maximum ballistic efficiency, long-range accuracy, and hunting performance in single-feed rifles.
.357 ORION Series – Ultra-Low Drag (ULD) steel-tip airgun slugs available in both magazine-compatible and single-feed configurations for exceptional competition and hunting performance.
.452 TETON Series – Ultra-Low Drag (ULD) aluminum-tip airgun slugs engineered for maximum ballistic efficiency, retained energy, and long-range accuracy.
.457 LANCER and TETON Series – Ultra-Low Drag (ULD) aluminum-tip airgun slugs developed for maximum ballistic efficiency, retained energy, and long-range precision.
.457 Slug Series – Magazine-compatible, precision-swaged 100% soft lead airgun slugs developed for outstanding accuracy and dependable hunting performance.
.510 LANCER and TETON Series – Ultra-Low Drag (ULD) aluminum-tip airgun slugs engineered for hunters and long-range shooters seeking maximum ballistic efficiency and retained energy.
.510 Slug Series – Magazine-compatible, precision-swaged 100% soft lead airgun slugs available in hollow point, round nose/hollow back, and Slugger configurations for exceptional accuracy and dependable hunting performance.