Load Specifications
Load data in caliber .221 Rem. Fireball with .224 | 50gr | Speer TNT bullet and 11 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% | 41,292 psi | 89% | 2743 fps | 99.6% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 41,075 psi | 89% | 2940 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,123 psi | 61% | 1834 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 40,118 psi | 86% | 2808 fps | 97% |
| Lovex S053 | <<locked>> | 92% | 40,422 psi | 87% | 2828 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,369 psi | 59% | 1873 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 40,567 psi | 87% | 2861 fps | 97% |
| Shooters World SOCOM | <<locked>> | 84% | 41,176 psi | 89% | 2808 fps | 96.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 96% | 41,568 psi | 90% | 2723 fps | 100% |
| Vihtavuori N110 | <<locked>> | 86% | 39,972 psi | 86% | 2772 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 41,524 psi | 89% | 2907 fps | 99.4% |
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% | 36,376 psi | 78% | 2644 fps | 99% |
| ADI AR 2207 | 14.9 gr | 90% | 30,589 psi | 66% | 2694 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,465 psi | 44% | 1644 fps | 100% |
| IMR 4227 | <<locked>> | 86% | 35,201 psi | 76% | 2700 fps | 95.6% |
| Lovex S053 | 12.7 gr | 80% | 28,529 psi | 61% | 2546 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,001 psi | 43% | 1680 fps | 100% |
| ReloadSwiss RS 36 | 14.8 gr | 86% | 33,852 psi | 73% | 2713 fps | 95% |
| Shooters World SOCOM | <<locked>> | 82% | 38,290 psi | 83% | 2746 fps | 95.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 27,021 psi | 58% | 2425 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 33,489 psi | 72% | 2641 fps | 100% |
| Vihtavuori N120 | <<locked>> | 86% | 27,427 psi | 59% | 2566 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 19 powders for .221 Rem. Fireball loaded with the .224 | 50gr | Speer TNT. ADI AR 2207 delivers the highest muzzle velocity at 2,940 fps; across all powders the maximum-charge window runs from 1,834 fps to 2,940 fps. ADI AR 2207 gives the best case fill at 100 %, and 19 of the 19 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (320 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 50.0 gr projectile in 0.224" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2207, Alliant Reloder-10x, 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 | 50gr | Speer TNT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 1680, Alliant Reloder-10x, Alliant Reloder-7 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.