Load Specifications
Load data in caliber .221 Rem. Fireball with .224 | 55gr | Prvi Partizan SP bullet and 16 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2207, Vihtavuori N120 and ReloadSwiss RS 36.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2205 | <<locked>> | 82% | 41,481 psi | 89% | 2631 fps | 99.9% |
| ADI AR 2207 | <<locked>> | 96% | 40,001 psi | 86% | 2799 fps | 99.2% |
| Alliant Reloder-7 | <<locked>> | 94% | 40,176 psi | 87% | 2740 fps | 96.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,877 psi | 62% | 1759 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 41,205 psi | 89% | 2762 fps | 96.8% |
| IMR 4227 | <<locked>> | 88% | 39,842 psi | 86% | 2690 fps | 98% |
| Lovex D060 | <<locked>> | 82% | 41,901 psi | 90% | 2743 fps | 96.8% |
| Lovex S053 | <<locked>> | 90% | 41,191 psi | 89% | 2720 fps | 99.9% |
| Norma 200ᴾ | <<locked>> | 100% | 41,814 psi | 90% | 2831 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,181 psi | 61% | 1795 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 90% | 41,437 psi | 89% | 2766 fps | 98.2% |
| Shooters World Buffalo Rifle | <<locked>> | 82% | 41,901 psi | 90% | 2743 fps | 96.8% |
| Shooters World SOCOM | <<locked>> | 82% | 40,930 psi | 88% | 2694 fps | 97.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 92% | 40,524 psi | 87% | 2582 fps | 100% |
| Vihtavuori N110 | <<locked>> | 84% | 40,451 psi | 87% | 2651 fps | 100% |
| Vihtavuori N120 | <<locked>> | 96% | 40,277 psi | 87% | 2766 fps | 99.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2205 | <<locked>> | 80% | 39,262 psi | 85% | 2592 fps | 99.8% |
| ADI AR 2207 | 13.9 gr | 84% | 27,586 psi | 59% | 2503 fps | 95.6% |
| Alliant Reloder-7 | <<locked>> | 92% | 37,362 psi | 81% | 2684 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,031 psi | 45% | 1572 fps | 100% |
| IMR 4198 | <<locked>> | 96% | 36,405 psi | 78% | 2657 fps | 95.3% |
| IMR 4227 | <<locked>> | 80% | 31,836 psi | 69% | 2510 fps | 95.7% |
| Lovex D060 | <<locked>> | 80% | 39,015 psi | 84% | 2680 fps | 96.1% |
| Lovex S053 | <<locked>> | 80% | 30,661 psi | 66% | 2493 fps | 98.5% |
| Norma 200 | <<locked>> | 94% | 34,722 psi | 75% | 2687 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,624 psi | 44% | 1611 fps | 100% |
| ReloadSwiss RS 36 | 13.8 gr | 80% | 30,371 psi | 65% | 2516 fps | 95% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 39,015 psi | 84% | 2680 fps | 96.1% |
| Shooters World SOCOM | <<locked>> | 80% | 38,769 psi | 84% | 2651 fps | 96.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 28,964 psi | 62% | 2356 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 35,984 psi | 78% | 2569 fps | 100% |
| Vihtavuori N120 | 13.2 gr | 80% | 24,627 psi | 53% | 2379 fps | 95.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 16 powders for .221 Rem. Fireball loaded with the .224 | 55gr | Prvi Partizan SP. Norma 200 delivers the highest muzzle velocity at 2,831 fps; across all powders the maximum-charge window runs from 1,759 fps to 2,831 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 16 of the 16 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (320 MPa), the top charges use 61–90 %, leaving at least 10 % headroom. The 55.0 gr projectile in 0.224" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, IMR 4198, Norma 200 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. ADI AR 2207, Vihtavuori N120, ReloadSwiss RS 36 rank at the top here: for .221 Rem. Fireball with the .224 | 55gr | Prvi Partizan SP they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.