.221 Remington Fireball

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.221 Remington Fireball
Remington / Wayne Leek
ManufacturerRemington
Produced1963
Specifications
Parent case.222 Remington
Case typeRimless, bottleneck
Bullet diameter.224 in (5.7 mm)
Neck diameter.253 in (6.4 mm)
Shoulder diameter.361 in (9.2 mm)
Base diameter.376 in (9.6 mm)
Rim diameter.378 in (9.6 mm)
Rim thickness.045 in (1.1 mm)
Case length1.400 in (35.6 mm)
Overall length1.830 in (46.5 mm)
Rifling twist1-12 in (300 mm)
Primer typeSmall rifle
Maximum CUP52,000 CUP
Ballistic performance
Bullet mass/type Velocity Energy
45 gr (2.9 g) SP – Pistol 2,947 ft/s (898 m/s) 868 ft⋅lbf (1,177 J)
50 gr (3.2 g) SX – Pistol 2,813 ft/s (857 m/s) 879 ft⋅lbf (1,192 J)
55 gr (3.6 g) SBT – Pistol 2,700 ft/s (820 m/s) 891 ft⋅lbf (1,208 J)
45 gr (2.9 g) SP – Rifle 3,203 ft/s (976 m/s) 1,025 ft⋅lbf (1,390 J)
55 gr (3.6 g) SBT – Rifle 2,950 ft/s (900 m/s) 1,063 ft⋅lbf (1,441 J)
Test barrel length: 14 in (360 mm), 24 in (610 mm)
Source(s): Accurate Powder[1]

The .221 Remington Fireball (5.7x35mm), often simply referred to as .221 Fireball, is a

bolt-action pistol, the XP-100.[2] A shortened version of the .222 Remington
, it is popular as a varmint and small predator round while also finding use among target shooters. It has application as both a pistol round and as a rifle round.

History

In the early 1960s Remington was working on an experimental bolt-action pistol based on their Model 600 action. The goal was a highly accurate pistol that would be well suited for competition. After working with the .222 Remington they determined that it contained more powder capacity than was necessary to work efficiently in the shorter barrels of pistols. While rifle barrels commonly range in length from 14.5 to 26 in (37 to 66 cm), pistol barrels are typically much shorter, ranging from 2 to 12 in (5.1 to 30.5 cm) although occasionally up to 16 in (41 cm) for some competition barrels. As a result, Remington decided to develop a shorter version of the .222 Remington cartridge, optimized for use in the XP-100.

While production of XP-100 pistols chambered in .221 Fireball was eventually canceled after 1985,

Thompson Center Arms produced various single-shot
pistols chambered for the .221 Fireball as part of their Contender and Encore models. Rifles chambered for the .221 Fireball include the Remington 700 and the Ceska zbrojovka CZ 527.

Performance

Despite its smaller size, the .221 Fireball is capable of velocities nearly equal to that of the .222 Remington largely due to its higher SAAMI pressure. The maximum SAAMI pressure level for the .221 Fireball is 52,000 C.U.P. as compared to 46,000 C.U.P. for the .222 Remington. The purpose of the increased pressure was to allow it to perform more effectively in the shorter barrel of the XP-100.

The .221 Fireball produces the highest velocity of any commercial pistol cartridge.[4]

Offshoots

The .221 Fireball has been used by

Knight's Armament Corporation for their new Knight's Armament Company PDW
as the 6×35mm PDW.

Gallery

  • L-R: 40 gr Hornady V-Max, 55 gr Sierra BlitzKing, .221 Remington Fireball, .22 LR Remington Golden Bullet
    L-R: 40 gr Hornady V-Max, 55 gr Sierra BlitzKing, .221 Remington Fireball, .22 LR Remington Golden Bullet
  • .17 Remington Fireball next to its parent case, the .221 Remington Fireball.
    .17 Remington Fireball next to its parent case, the .221 Remington Fireball.

See also

References

  1. ^ Pistol reload data at Accurate Powder
  2. ^ The .221 Remington Fireball (subscription req)
  3. ^ Remington Arms "Remington Model XP-100" Archived 2012-10-16 at the Wayback Machine.
  4. ^ "The .221 Fireball by Chuck Hawks". Chuckhawks.com. Retrieved 2013-12-25.
  5. ^ "17 Mach IV at Accurate Reloading". Accuratereloading.com. 2000-06-30. Retrieved 2013-12-25.
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