.221 Rem. Fireball Load Data & Reloading Guide

Rifle

Also known as: .221 Remington Fireball, 5.6×35mm Fireball, .221 Fireball

About .221 Rem. Fireball

The .221 Remington Fireball was introduced by Remington in 1963 specifically for their compact XP-100 pistol. With its roots tracing back to benchrest shooting and precision firearms design, the .221 Remington Fireball quickly garnered attention for its efficient case design that delivers high velocity with relatively low powder capacity. Its development capitalized on the increasing popularity of shorter-action, highly efficient cartridges during the mid-20th century.

Technically, the .221 Remington Fireball uses a rimless, bottleneck case, measuring approximately 1.40 inches in length, allowing it to be chambered in shorter actions. Typical bullet diameters are .224 inches, consistent with most small caliber centerfire rounds. With its compact design, reloaders find the cartridge easier to handle, aiding station processes and increasing throughput while minimizing resource use like powder, making it cost-effective.

Ballistically, the .221 Fireball is noted for its ability to propel bullets at velocities exceeding 3,000 feet per second. Typical bullet weights range from 40 to 55 grains, where the lighter projectiles are used for varmint hunting and target shooting, providing flat trajectories and minimal recoil. Heavier bullets may be employed for purposes that require greater penetration and terminal ballistics.

The cartridge's efficiency is a key advantage for reloaders, offering robust performance with less powder compared to larger calibers. Its compact size also generates less heat and barrel wear, contributing to longer firearms life. This offers reloaders an attractive option for creating custom loads tailored specifically for a range of applications from precision shooting, target practice, to small game hunting. The .221 Remington Fireball thus remains a versatile and cost-effective choice for those in pursuit of performance and efficiency.

Technical Drawing

.221 Rem. Fireball cartridge dimensions, C.I.P.L1 = 27.2 mm, L2 = 30.42 mm, L3 = 35.56 mm, L6 = 46.48 mmL1 = 27.20 mmL2 = 30.42 mmL3 = 35.56 mmL6 = 46.48 mm46.0°

Based on C.I.P., the max. allowed case length is 1.400 in / 35.56 mm, the max. cartridge length is 1.830 in / 46.48 mm, and the max. allowed pressure is 46,412 PSI / 3,200 bar.

Technical Specifications

Maximum Pressure:46412 PSI / 3200 bar
Case Volume:22 Grains of Water
Primer Size:Small Rifle (SR)
Safety Standard:C.I.P. (Datasheet)
Bore Area:25.09 mm²
Barrel Diameter:0.224" / 5.7 mm
L1:1.071" / 27.20 mm
L2:1.198" / 30.42 mm
L3:1.400" / 35.56 mm
L6:1.830" / 46.48 mm

Start Calculating to Develop your own Load Data for .221 Rem. Fireball

Use our professional ballistics calculator to develop safe and accurate load recipes for .221 Rem. Fireball.

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Brass Case Capacities

The following table shows the case capacity (Grains of Water) for brass in cartridge .221 Rem. Fireball where we have data (number of datapoints in brackets).

Remington (1)21.7

Standard Load Data — .221 Rem. Fireball

Select your desired cartridge and bullet weight below to access the corresponding load table. From there, you can choose any listed load recipe and transfer it directly into the ballistics calculator for further refinement, optimization, and precision tuning.

All
35 gr
40 gr
45 gr
46 gr
50 gr
53 gr
54 gr
55 gr
60 gr
63 gr
64 gr
69 gr
75 gr

Frequently Asked Questions

The maximum pressure for .221 Rem. Fireball is 46,412 psi | 3,200 bar.

.221 Rem. Fireball typically uses a Small Rifle (SR) primer.

The case capacity of .221 Rem. Fireball is approximately 22 grains of water (H₂O).