Load Specifications
Load data in caliber .221 Rem. Fireball with .224 | 55gr | Sierra SP BlitzKing bullet and 30 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 36, ADI AR 2207 and Lovex S053.
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>> | 84% | 41,582 psi | 90% | 2592 fps | 99.8% |
| ADI AR 2205 | <<locked>> | 82% | 41,249 psi | 89% | 2618 fps | 99.9% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 41,104 psi | 89% | 2779 fps | 98.9% |
| ADI AR 2207 | <<locked>> | 98% | 41,278 psi | 89% | 2815 fps | 99.2% |
| Alliant Reloder-7 | <<locked>> | 98% | 41,481 psi | 89% | 2720 fps | 95.9% |
| Alliant Reloder-7 | <<locked>> | 96% | 41,452 psi | 89% | 2756 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 27,804 psi | 60% | 1703 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,747 psi | 62% | 1749 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 40,408 psi | 87% | 2733 fps | 96.4% |
| IMR 4227 | <<locked>> | 90% | 39,856 psi | 86% | 2644 fps | 97.4% |
| IMR 4227 | <<locked>> | 90% | 41,872 psi | 90% | 2717 fps | 98.3% |
| Lovex D060 | <<locked>> | 84% | 41,945 psi | 90% | 2694 fps | 96.1% |
| Lovex D060 | <<locked>> | 82% | 40,886 psi | 88% | 2710 fps | 96.4% |
| Lovex S053 | <<locked>> | 92% | 40,248 psi | 87% | 2664 fps | 99.7% |
| Lovex S053 | <<locked>> | 90% | 40,074 psi | 86% | 2690 fps | 99.8% |
| Norma 200ᴾ | <<locked>> | 100% | 40,930 psi | 88% | 2808 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,093 psi | 58% | 1742 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,065 psi | 60% | 1785 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 40,205 psi | 87% | 2697 fps | 97.3% |
| ReloadSwiss RS 36 | <<locked>> | 90% | 40,437 psi | 87% | 2736 fps | 97.9% |
| Shooters World Buffalo Rifle | <<locked>> | 84% | 41,945 psi | 90% | 2694 fps | 96.1% |
| Shooters World Buffalo Rifle | <<locked>> | 82% | 40,886 psi | 88% | 2710 fps | 96.4% |
| Shooters World SOCOM | <<locked>> | 84% | 40,669 psi | 88% | 2641 fps | 96.6% |
| Shooters World SOCOM | <<locked>> | 82% | 40,727 psi | 88% | 2680 fps | 97.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 96% | 41,727 psi | 90% | 2566 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 94% | 41,698 psi | 90% | 2592 fps | 100% |
| Vihtavuori N110 | <<locked>> | 86% | 40,524 psi | 87% | 2618 fps | 100% |
| Vihtavuori N110 | <<locked>> | 84% | 40,030 psi | 86% | 2638 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 41,495 psi | 89% | 2746 fps | 99.6% |
| Vihtavuori N120 | <<locked>> | 98% | 41,669 psi | 90% | 2779 fps | 99.8% |
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% | 36,999 psi | 80% | 2503 fps | 99.3% |
| ADI AR 2205 | <<locked>> | 80% | 38,290 psi | 83% | 2562 fps | 99.7% |
| ADI AR 2207 | 14.3 gr | 88% | 28,805 psi | 62% | 2500 fps | 95.4% |
| ADI AR 2207 | 13.6 gr | 84% | 26,774 psi | 58% | 2470 fps | 95.1% |
| Alliant Reloder-7 | <<locked>> | 96% | 39,146 psi | 84% | 2674 fps | 95.2% |
| Alliant Reloder-7 | <<locked>> | 92% | 37,188 psi | 80% | 2667 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,247 psi | 44% | 1526 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,813 psi | 45% | 1562 fps | 100% |
| IMR 4198 | <<locked>> | 96% | 36,318 psi | 78% | 2644 fps | 95.1% |
| IMR 4227 | <<locked>> | 84% | 33,344 psi | 72% | 2503 fps | 95.4% |
| IMR 4227 | <<locked>> | 80% | 30,864 psi | 67% | 2474 fps | 95.1% |
| Lovex D060 | <<locked>> | 82% | 38,769 psi | 84% | 2628 fps | 95.2% |
| Lovex D060 | <<locked>> | 80% | 38,696 psi | 83% | 2664 fps | 95.8% |
| Lovex S053 | 12.5 gr | 80% | 28,181 psi | 61% | 2392 fps | 97.2% |
| Lovex S053 | 12.5 gr | 80% | 30,269 psi | 65% | 2474 fps | 98.3% |
| Norma 200 | <<locked>> | 96% | 35,897 psi | 77% | 2703 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 19,856 psi | 43% | 1562 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,421 psi | 44% | 1598 fps | 100% |
| ReloadSwiss RS 36 | 14.5 gr | 86% | 33,721 psi | 73% | 2559 fps | 95.5% |
| ReloadSwiss RS 36 | 13.9 gr | 82% | 31,836 psi | 69% | 2543 fps | 95.4% |
| Shooters World Buffalo Rifle | <<locked>> | 82% | 38,769 psi | 84% | 2628 fps | 95.2% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 38,696 psi | 83% | 2664 fps | 95.8% |
| Shooters World SOCOM | <<locked>> | 80% | 36,158 psi | 78% | 2549 fps | 95.3% |
| Shooters World SOCOM | <<locked>> | 80% | 37,869 psi | 82% | 2621 fps | 96.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 26,847 psi | 58% | 2277 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 28,543 psi | 62% | 2339 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 33,460 psi | 72% | 2487 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 35,505 psi | 77% | 2552 fps | 100% |
| Vihtavuori N120 | <<locked>> | 84% | 26,078 psi | 56% | 2385 fps | 95.4% |
| Vihtavuori N120 | <<locked>> | 80% | 24,366 psi | 53% | 2362 fps | 95.2% |
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 30 powders for .221 Rem. Fireball loaded with the .224 | 55gr | Sierra SP BlitzKing. ADI AR 2207 delivers the highest muzzle velocity at 2,815 fps; across all powders the maximum-charge window runs from 1,703 fps to 2,815 fps. ADI AR 2207 gives the best case fill at 100 %, and 30 of the 30 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (320 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 55.0 gr projectile in 0.224" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2207, Hodgdon TrailBoss, Hodgdon TrailBoss 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. ReloadSwiss RS 36, ADI AR 2207, Lovex S053 rank at the top here: for .221 Rem. Fireball with the .224 | 55gr | Sierra SP BlitzKing 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.