Load Specifications
Load data in caliber .221 Rem. Fireball with .224 | 56gr | RWS TMS bullet and 13 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>> | 90% | 41,133 psi | 89% | 2687 fps | 96% |
| ADI AR 2207 | <<locked>> | 96% | 40,654 psi | 88% | 2792 fps | 99.4% |
| Alliant Reloder-7 | <<locked>> | 94% | 40,770 psi | 88% | 2736 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,703 psi | 62% | 1742 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 41,756 psi | 90% | 2756 fps | 97.3% |
| IMR 4227 | <<locked>> | 88% | 41,191 psi | 89% | 2697 fps | 98.5% |
| Lovex S053 | <<locked>> | 90% | 41,814 psi | 90% | 2713 fps | 100% |
| Norma 200 | <<locked>> | 98% | 40,234 psi | 87% | 2785 fps | 97.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,007 psi | 60% | 1778 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 88% | 39,827 psi | 86% | 2717 fps | 98.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 92% | 41,191 psi | 89% | 2572 fps | 100% |
| Vihtavuori N110 | <<locked>> | 82% | 38,885 psi | 84% | 2605 fps | 100% |
| Vihtavuori N120 | <<locked>> | 96% | 40,959 psi | 88% | 2759 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>> | 88% | 38,319 psi | 83% | 2631 fps | 95.2% |
| ADI AR 2207 | 13.7 gr | 82% | 26,614 psi | 57% | 2457 fps | 95.5% |
| Alliant Reloder-7 | <<locked>> | 90% | 36,651 psi | 79% | 2651 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,929 psi | 45% | 1558 fps | 100% |
| IMR 4198 | <<locked>> | 94% | 35,650 psi | 77% | 2625 fps | 95.4% |
| IMR 4227 | <<locked>> | 80% | 32,343 psi | 70% | 2507 fps | 96.2% |
| Lovex S053 | <<locked>> | 80% | 31,241 psi | 67% | 2490 fps | 98.8% |
| Norma 200 | <<locked>> | 92% | 33,547 psi | 72% | 2644 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,552 psi | 44% | 1594 fps | 100% |
| ReloadSwiss RS 36 | 13.9 gr | 80% | 30,980 psi | 67% | 2516 fps | 95.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 29,530 psi | 64% | 2352 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 36,666 psi | 79% | 2562 fps | 100% |
| Vihtavuori N120 | 13.4 gr | 80% | 25,599 psi | 55% | 2395 fps | 96.4% |
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 13 powders for .221 Rem. Fireball loaded with the .224 | 56gr | RWS TMS. ADI AR 2207 delivers the highest muzzle velocity at 2,792 fps; across all powders the maximum-charge window runs from 1,742 fps to 2,792 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 13 of the 13 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. Hodgdon TrailBoss, IMR 4198, 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, Vihtavuori N120, ReloadSwiss RS 36 rank at the top here: for .221 Rem. Fireball with the .224 | 56gr | RWS TMS 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.