JSB KnockOut MKII 6.35mm (.25) 33.49gr hollow point slugs are heavy, aerodynamic PCP air rifle slugs developed for shooters looking for precision, stability and consistent performance at longer distances. With a weight of 33.49 grain (2.17 g), a .250 / 6.35 mm diameter and a ballistic coefficient of 0.093, the KnockOut MKII is designed for powerful PCP air rifles capable of driving heavier slugs efficiently.

JSB KnockOut MKII Slugs for Powerful PCP Air Rifles

The MKII version features an updated rear profile with a deeper, flared base designed to improve aerodynamic stability. Combined with the streamlined slug shape, this helps the projectile retain velocity and maintain a stable trajectory over extended distances.

The hollow point design and JSB's soft lead construction provide effective energy transfer on impact, while the relatively high ballistic coefficient makes these slugs particularly interesting for precision shooters who want an alternative to conventional diabolo pellets.

Key Features

• JSB KnockOut MKII PCP air rifle slugs
• Calibre: 6.35 mm / .25
• Slug diameter: .250 / 6.35 mm
• Weight: 33.49 grain / 2.17 g
• Hollow point design
• Ballistic coefficient: 0.093
• Revised MKII rear profile with flared base
• Heavy slug designed for powerful PCP air rifles
• Aerodynamic profile for stable long-range flight
• Soft lead construction
• 150 slugs per tin
• Made by JSB Match Diabolo

Designed for Long-Range Precision Shooting

Compared with traditional diabolo pellets, the JSB KnockOut MKII uses a more streamlined slug profile designed to reduce aerodynamic drag. This makes it particularly suitable for PCP shooters who want to experiment with long-range air rifle shooting, tighter trajectories and heavier projectiles.

Because heavier slugs require sufficient power and the correct barrel compatibility, performance can vary between PCP air rifles. For the best results, always verify that your air rifle is suitable for .250 / 6.35 mm slugs and test different velocity settings to find the most accurate configuration for your setup.