Load Specifications
Load data in caliber .221 Rem. Fireball with .227 | 58gr | Reichenberg HDB Universal bullet and 17 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 |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 92% | 41,162 psi | 89% | 2618 fps | 95.9% |
| ADI AR 2205 | <<locked>> | 82% | 40,321 psi | 87% | 2526 fps | 99.9% |
| ADI AR 2207 | <<locked>> | 98% | 40,814 psi | 88% | 2730 fps | 99.4% |
| Alliant Reloder-7 | <<locked>> | 96% | 41,046 psi | 88% | 2674 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,398 psi | 61% | 1686 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 39,262 psi | 85% | 2638 fps | 96.4% |
| IMR 4227 | <<locked>> | 90% | 41,249 psi | 89% | 2631 fps | 98.4% |
| Lovex D060 | <<locked>> | 82% | 40,770 psi | 88% | 2631 fps | 96.7% |
| Lovex S053 | <<locked>> | 92% | 41,524 psi | 89% | 2641 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 39,595 psi | 85% | 2710 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,601 psi | 59% | 1722 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 90% | 39,885 psi | 86% | 2651 fps | 98.1% |
| Shooters World Buffalo Rifle | <<locked>> | 82% | 40,770 psi | 88% | 2631 fps | 96.7% |
| Shooters World SOCOM | <<locked>> | 82% | 39,436 psi | 85% | 2582 fps | 97.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 94% | 40,683 psi | 88% | 2500 fps | 100% |
| Vihtavuori N110 | <<locked>> | 86% | 41,974 psi | 90% | 2592 fps | 100% |
| Vihtavuori N120 | <<locked>> | 98% | 41,249 psi | 89% | 2697 fps | 99.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 90% | 38,101 psi | 82% | 2559 fps | 95% |
| ADI AR 2205 | <<locked>> | 80% | 38,072 psi | 82% | 2487 fps | 99.8% |
| ADI AR 2207 | 13.2 gr | 84% | 26,295 psi | 57% | 2392 fps | 95.3% |
| Alliant Reloder-7 | <<locked>> | 92% | 35,781 psi | 77% | 2569 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,131 psi | 43% | 1496 fps | 100% |
| IMR 4198 | <<locked>> | 96% | 35,070 psi | 76% | 2546 fps | 95% |
| IMR 4227 | <<locked>> | 80% | 30,458 psi | 66% | 2398 fps | 95.4% |
| Lovex D060 | <<locked>> | 80% | 37,753 psi | 81% | 2569 fps | 95.9% |
| Lovex S053 | <<locked>> | 80% | 29,109 psi | 63% | 2379 fps | 98.3% |
| Norma 200 | <<locked>> | 96% | 34,432 psi | 74% | 2605 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 19,711 psi | 42% | 1532 fps | 100% |
| ReloadSwiss RS 36 | 13.4 gr | 82% | 30,937 psi | 67% | 2454 fps | 95.5% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 37,753 psi | 81% | 2569 fps | 95.9% |
| Shooters World SOCOM | <<locked>> | 80% | 37,188 psi | 80% | 2536 fps | 96.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 27,775 psi | 60% | 2257 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 34,693 psi | 75% | 2464 fps | 100% |
| Vihtavuori N120 | 12.5 gr | 80% | 23,337 psi | 50% | 2267 fps | 95.1% |
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 17 powders for .221 Rem. Fireball loaded with the .227 | 58gr | Reichenberg HDB Universal. ADI AR 2207 delivers the highest muzzle velocity at 2,730 fps; across all powders the maximum-charge window runs from 1,686 fps to 2,730 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 17 of the 17 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 58.0 gr projectile in 0.227" calls for a 1:11.0 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 .227 | 58gr | Reichenberg HDB Universal 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.