Altaros ATP Smooth 6.46mm – Ultimate Long-Range .25 Slug
Performance
The Altaros ATP Smooth 6.46mm (.254) slugs are engineered
for shooters seeking top-tier accuracy and consistency from their .25 calibre
airgun. Manufactured using advanced CNC turning technology, these slugs deliver
extremely precise dimensions, making them ideal for high-performance platforms
such as the Huben K1.
With a refined aerodynamic profile and exceptional
consistency, they are built for precision shooting at extended distances.
CNC Turned for Elite Precision
These slugs are not pressed or cast—they are
precision-machined:
- Near-zero
weight variation
- Perfect
axial symmetry and balance
- Highly
consistent dimensions
This manufacturing method results in improved shot-to-shot
consistency and tighter groupings compared to traditional pellets.
High Ballistic Coefficient for Maximum Range
The defining feature of the 6.46mm Smooth variant is its
exceptional ballistic efficiency:
- Ballistic
coefficient around 0.21 (G1)
- Excellent
energy retention at distance
- Flatter
trajectory for long-range shooting
This makes it one of the highest-performing .25 airgun slugs
available for extended range use.
Optimised for Huben K1 Platforms
These slugs are specifically designed for:
- Huben
K1 air rifle
- Compatible
.25 calibre barrels with suitable bore sizing
The slightly larger 6.46mm (.2543) diameter ensures a
precise fit, improving air seal, efficiency, and overall accuracy.
Precision Weight & Dimensions
- Weight:
approx. 51 grain (3.32g)
- Length:
approx. 10.8mm
- Pack
size: 100 slugs
This balance of weight and length supports stable flight and
consistent performance.
Smooth Aerodynamic Profile
The “Smooth” design improves airflow and reduces drag:
- Reduced
turbulence compared to grooved slugs
- More
stable flight path at higher velocities
- Enhanced
long-range accuracy
This makes them particularly effective when pushing the
limits of airgun performance.
Engineered for Accuracy & Efficiency
Additional design advantages include:
- Extended
profile for improved barrel guidance
- Grooved
bearing surface for reduced friction
- Consistent
muzzle velocity due to tight tolerances
Together, these features maximise both precision and
repeatability.
Protective Packaging for Perfect Condition
Each slug is individually protected:
- Foam-seated
packaging prevents deformation
- Vacuum-sealed
to eliminate movement
- Maintains
perfect shape during transport
This ensures consistent performance straight out of the
pack.
Recommended Performance Setup
- Optimal
velocity: ~280 m/s (900 fps)
- Maximum
velocity: ~295 m/s (980 fps)
Operating within this range helps achieve the best accuracy
and consistency.
Key Features
- CNC
turned .25 calibre lead slugs
- High
ballistic coefficient (~0.21 G1)
- Precision
6.46mm (.254) diameter
- Approx.
51 grain weight
- Designed
for Huben K1 platforms
- Extremely
consistent manufacturing
- Supplied
in packs of 100
- Protective
packaging to maintain shape
Frequently Asked Questions (FAQ)
1. What makes the 6.46mm version different from 6.45mm?
The slightly larger diameter provides a tighter fit in
certain barrels, improving sealing and consistency.
2. Are these better than standard pellets?
Yes, CNC turning results in higher consistency and better
long-range accuracy.
3. What is the advantage of the “Smooth” design?
It reduces drag and improves ballistic efficiency, making it
better for long-range shooting.
4. Are these only for Huben rifles?
They are optimised for Huben K1 but may work in other .25
barrels with the correct bore size.
5. What velocity should I use?
Around 280 m/s (900 fps) is ideal for best
performance.
6. How many slugs are included?
Each pack contains approximately 100 slugs.
7. Are they suitable for long-range shooting?
Yes, they are specifically designed for medium to
long-range airgun use.
8. Who are these best suited for?
They are ideal for precision shooters and Huben users
seeking maximum accuracy and consistency.
