Load Specifications
Load data in caliber .221 Rem. Fireball with .224 | 50gr | Speer HP TNT Green bullet and 11 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2207, ReloadSwiss RS 36 and Vihtavuori N120.
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% | 39,856 psi | 86% | 2730 fps | 99.6% |
| ADI AR 2207 | <<locked>> | 98% | 39,610 psi | 85% | 2923 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,166 psi | 61% | 1844 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 40,886 psi | 88% | 2835 fps | 97.4% |
| Lovex S053 | <<locked>> | 92% | 41,321 psi | 89% | 2854 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,369 psi | 59% | 1883 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 41,249 psi | 89% | 2887 fps | 97.4% |
| Shooters World SOCOM | <<locked>> | 84% | 41,829 psi | 90% | 2831 fps | 96.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 94% | 40,190 psi | 87% | 2710 fps | 100% |
| Vihtavuori N110 | <<locked>> | 86% | 41,017 psi | 88% | 2802 fps | 100% |
| Vihtavuori N120 | <<locked>> | 98% | 40,001 psi | 86% | 2887 fps | 99.3% |
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% | 37,130 psi | 80% | 2671 fps | 99.2% |
| ADI AR 2207 | 14.8 gr | 88% | 29,124 psi | 63% | 2664 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,581 psi | 44% | 1654 fps | 100% |
| IMR 4227 | <<locked>> | 84% | 34,026 psi | 73% | 2684 fps | 95.4% |
| Lovex S053 | <<locked>> | 80% | 28,761 psi | 62% | 2562 fps | 97.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,160 psi | 43% | 1693 fps | 100% |
| ReloadSwiss RS 36 | 15.1 gr | 86% | 34,519 psi | 74% | 2740 fps | 95.4% |
| Shooters World SOCOM | <<locked>> | 80% | 36,898 psi | 80% | 2730 fps | 95.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 27,311 psi | 59% | 2441 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 34,476 psi | 74% | 2674 fps | 100% |
| Vihtavuori N120 | 14.2 gr | 84% | 26,571 psi | 57% | 2552 fps | 95.3% |
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 11 powders for .221 Rem. Fireball loaded with the .224 | 50gr | Speer HP TNT Green. ADI AR 2207 delivers the highest muzzle velocity at 2,923 fps; across all powders the maximum-charge window runs from 1,844 fps to 2,923 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 11 of the 11 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. Hodgdon TrailBoss, ReloadSwiss RS 14 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, ReloadSwiss RS 36, Vihtavuori N120 rank at the top here: for .221 Rem. Fireball with the .224 | 50gr | Speer HP TNT Green 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.