John Lazzeroni's proprietary ultra-magnum 7mm: an enormous beltless case generating velocities that approach the theoretical maximum for 7mm bullets.
Type: Rifle
Introduced: 1996, United States
Parent case: None
Standardization: Proprietary
Bullet diameter: 0.284" (7.21 mm)
Case length: 2.82" (71.63 mm)
Overall length: 3.7" (93.98 mm)
Max pressure: 65,000 PSI
Rim type: Rimless
Primer: Large Rifle Magnum
Typical twist rate: 1:9
Muzzle velocity: 3300–3600 fps
Muzzle energy: 3384–4029 ft-lbs
Effective range: 800 yd
Common bullet weights: 140, 160, 180 gr
Primary use: Hunting, Target
Production status: Limited
Also known as: 7.21 Firebird · Lazzeroni 7.21mm Firebird
History: Introduced by John Lazzeroni in 1996 as part of his proprietary cartridge family designed around a new metric naming convention (bore diameter in mm). Lazzeroni's approach was to build beltless magnums on larger, fatter cases than the traditional H&H-derived designs, avoiding the accuracy issues associated with headspacing on a belt. The 7.21 Firebird's case capacity dwarfs conventional 7mm…
Notable firearms: Lazzeroni L2000ST, Custom Remington 700 actions (extended)
Similar cartridges: 7mm STW, .28 Nosler, 7mm Rem Mag