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221RemFireball
.221 Remington Fireball
Country of origin

United States of America

Manufacturers

Remington

Designer

Remington
Wayne Leek

Year(s) designed

1963

Year production began

1963

Cartridge type

Pistol/Rifle

Parent cartridge

.222 Remington

Overall length

1.830 inches (46.5 mm)

Case length

1.400 inches (35.6 mm)

Neck diameter

.253 inches (6.4 mm)

Shoulder diameter

.361 inches (9.2 mm)

Base diameter

.376 inches (9.6 mm)

Rim diameter

.378 inches (9.6 mm)

Rim thickness

.045 inches (1.1 mm)

Rifling twist

1-12"

Primer type

Small rifle


The .221 Remington Fireball (5.7x35.6mm), also known as the .221 Fireball, is a case produced by Remington.

HistoryEdit

In the 1960s, Remington was creating a highly-accurate, competition-suitable experimental pistol based on their Model 600 action. After working with the .222 Remington, it was determined that the .222 cartridge contained more powder capacity than what was needed to work well in the shorter barrels of pistols. As such, Remington developed the .221 cartridge for their experimental pistol, the XP-100.

Design DetailsEdit

Despite its smaller size, the .221 cartridge's velocity is very similar to that of its parent cartridge.

PerformanceEdit

The .221 produces the highest velocity of any pistol cartridge.

Related cartridgeEdit

The .221 has been used by wildcatters as a basis for a smaller cartridge, the .17 Mach IV.

ReferencesEdit

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