Load Specifications
Load data in caliber .221 Rem. Fireball with .223 | 52gr | SUS-TAC HP bullet and 12 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 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 |
|---|---|---|---|---|---|---|
| Accurate No. 11 FS | <<locked>> | 82% | 41,684 psi | 90% | 2762 fps | 98.7% |
| ADI AR 2205 | <<locked>> | 84% | 41,394 psi | 89% | 2677 fps | 99.7% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 40,973 psi | 88% | 2867 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 27,615 psi | 60% | 1768 fps | 100% |
| IMR 4227 | <<locked>> | 92% | 41,930 psi | 90% | 2772 fps | 97.5% |
| Lovex S053 | <<locked>> | 92% | 39,842 psi | 86% | 2746 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 26,890 psi | 58% | 1808 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 40,292 psi | 87% | 2785 fps | 97.1% |
| Shooters World SOCOM | <<locked>> | 84% | 40,857 psi | 88% | 2733 fps | 96.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 96% | 41,495 psi | 89% | 2654 fps | 100% |
| Vihtavuori N110 | <<locked>> | 86% | 39,740 psi | 86% | 2697 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 41,423 psi | 89% | 2835 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 |
|---|---|---|---|---|---|---|
| Accurate No. 11 FS | <<locked>> | 80% | 38,653 psi | 83% | 2703 fps | 98.2% |
| ADI AR 2205 | <<locked>> | 80% | 36,289 psi | 78% | 2575 fps | 99% |
| ADI AR 2207 | 14.3 gr | 90% | 30,211 psi | 65% | 2621 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,363 psi | 44% | 1591 fps | 100% |
| IMR 4227 | <<locked>> | 84% | 33,228 psi | 72% | 2585 fps | 95% |
| Lovex S053 | <<locked>> | 80% | 28,253 psi | 61% | 2474 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 19,928 psi | 43% | 1627 fps | 100% |
| ReloadSwiss RS 36 | 14.5 gr | 88% | 35,331 psi | 76% | 2680 fps | 95.6% |
| Shooters World SOCOM | <<locked>> | 82% | 37,927 psi | 82% | 2671 fps | 95.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 26,585 psi | 57% | 2352 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 33,025 psi | 71% | 2566 fps | 100% |
| Vihtavuori N120 | 13.7 gr | 86% | 27,441 psi | 59% | 2507 fps | 95.7% |
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 12 powders for .221 Rem. Fireball loaded with the .223 | 52gr | SUS-TAC HP. ADI AR 2207 delivers the highest muzzle velocity at 2,867 fps; across all powders the maximum-charge window runs from 1,768 fps to 2,867 fps. ADI AR 2207 gives the best case fill at 100 %, and 12 of the 12 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 52.0 gr projectile in 0.223" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. ADI AR 2207, 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. ReloadSwiss RS 36, ADI AR 2207, Vihtavuori N120 rank at the top here: for .221 Rem. Fireball with the .223 | 52gr | SUS-TAC HP 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.