Load Specifications
Load data in caliber .221 Rem. Fireball with .223 | 56gr | SUS-TAC Target bullet and 15 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 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>> | 82% | 39,900 psi | 86% | 2543 fps | 99.7% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 41,989 psi | 90% | 2779 fps | 99.2% |
| Alliant Reloder-7 | <<locked>> | 96% | 39,885 psi | 86% | 2674 fps | 95.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,442 psi | 61% | 1703 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 40,654 psi | 88% | 2644 fps | 97.8% |
| Lovex D060 | <<locked>> | 82% | 39,523 psi | 85% | 2628 fps | 95.7% |
| Lovex S053 | <<locked>> | 92% | 40,988 psi | 88% | 2661 fps | 99.8% |
| Norma 200ᴾ | <<locked>> | 100% | 38,624 psi | 83% | 2713 fps | 95.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,717 psi | 60% | 1742 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 41,756 psi | 90% | 2710 fps | 98% |
| Shooters World Buffalo Rifle | <<locked>> | 82% | 39,523 psi | 85% | 2628 fps | 95.7% |
| Shooters World SOCOM | <<locked>> | 82% | 39,001 psi | 84% | 2595 fps | 96.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 94% | 40,132 psi | 86% | 2523 fps | 100% |
| Vihtavuori N110 | <<locked>> | 86% | 41,408 psi | 89% | 2612 fps | 100% |
| Vihtavuori N120 | <<locked>> | 98% | 39,900 psi | 86% | 2700 fps | 99.5% |
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% | 37,666 psi | 81% | 2503 fps | 99.5% |
| ADI AR 2207 | 13.3 gr | 86% | 27,804 psi | 60% | 2454 fps | 95.3% |
| Alliant Reloder-7 | <<locked>> | 94% | 37,710 psi | 81% | 2631 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,175 psi | 43% | 1509 fps | 100% |
| IMR 4227 | <<locked>> | 82% | 32,024 psi | 69% | 2457 fps | 95.3% |
| Lovex D060 | <<locked>> | 80% | 37,289 psi | 80% | 2579 fps | 95% |
| Lovex S053 | 11.8 gr | 80% | 28,834 psi | 62% | 2392 fps | 97.7% |
| Norma 200 | <<locked>> | 98% | 36,390 psi | 78% | 2667 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 19,798 psi | 43% | 1545 fps | 100% |
| ReloadSwiss RS 36 | 13.5 gr | 84% | 32,445 psi | 70% | 2513 fps | 95.3% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 37,289 psi | 80% | 2579 fps | 95% |
| Shooters World SOCOM | <<locked>> | 80% | 36,825 psi | 79% | 2549 fps | 95.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 27,470 psi | 59% | 2274 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 34,287 psi | 74% | 2484 fps | 100% |
| Vihtavuori N120 | <<locked>> | 82% | 24,656 psi | 53% | 2326 fps | 95% |
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 15 powders for .221 Rem. Fireball loaded with the .223 | 56gr | SUS-TAC Target. ADI AR 2207 delivers the highest muzzle velocity at 2,779 fps; across all powders the maximum-charge window runs from 1,703 fps to 2,779 fps. ADI AR 2207 gives the best case fill at 100 %, and 15 of the 15 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (320 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 56.0 gr projectile in 0.223" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. ADI AR 2207, Hodgdon TrailBoss, 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, ReloadSwiss RS 36, Lovex S053 rank at the top here: for .221 Rem. Fireball with the .223 | 56gr | SUS-TAC Target 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.