The Norma Biathlon Sport-22 .22 LR 40gr LRN is a specialised sub-sonic rimfire cartridge engineered for cold-weather biathlon training and precision target disciplines. Featuring a 40-grain (2.6-gram) solid Lead Round Nose projectile, this ammunition delivers a muzzle velocity of 320 m/s (1,050 fps) and a muzzle energy of 137 Joules. Built with temperature-stable propellants and specialized lubricants, it ensures reliable mechanical cycling and ignition in sub-zero environments below -20°C, producing predictable trajectories across standard 50-metre shooting lanes.

• Cold-Weather Formulation: Engineered with specialized projectile lubricants and temperature-stable propellants to prevent velocity variance and cycling malfunctions in temperatures dropping below -20°C.
• Sub-Sonic Trajectory: Exits the muzzle at 320 m/s with a ballistic coefficient of 0.135 G1, remaining stable and avoiding transonic disruption to maintain tight groupings at 50 metres ($V_{50} = 294\text{ m/s}$, $E_{50} = 115\text{ J}$).
• Standard Rimfire Compatibility: Functions across all standard .22 Long Rifle actions, including straight-pull biathlon rifles, bolt-action smallbore target rifles, semi-automatic rimfires, and target pistols.

Specifications

• Calibre: .22 Long Rifle (.22 LR)
• Bullet Type: Lead Round Nose (LRN)
• Bullet Weight: 40 grains / 2.6 grams
• Muzzle Velocity ($V_0$): 320 m/s
• Muzzle Energy ($E_0$): 137 Joules
• Ballistic Coefficient: 0.135 G1
• Package Quantity: 50 rounds per box
• Licensing Requirement: Valid Australian Firearms Licence (Category A)

Who is the Norma Biathlon Sport-22 40gr LRN 50 Pack for?

• Competitive Biathletes — Delivers dependable ignition and consistent bolt-action cycling in sub-zero conditions below -20°C while maintaining a uniform sub-sonic muzzle velocity of 320 m/s for repeatable training across 50-metre biathlon range targets.
• Smallbore Target Shooters — Provides an aerodynamic 0.135 G1 ballistic coefficient with a 40-grain solid projectile that generates 137 Joules of muzzle energy, engineered for tight grouping consistency in 50m to 100m rimfire target disciplines.

Less suitable for: Pinnacle-level Olympic or World Cup competition requiring match-selected variance tolerances (where premium tier match-grade rimfire ammunition is standard), or ethical small-game hunting and pest control of rabbits and foxes, which requires dedicated expanding hollow-point rimfire ammunition rather than non-expanding solid lead projectiles.