Load Specifications
Load data in caliber .221 Rem. Fireball with .224 | 50gr | Fox Classic Hunter bullet and 11 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Lovex S053, Vihtavuori N110 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>> | 84% | 40,988 psi | 88% | 2792 fps | 98.1% |
| ADI AR 2205 | <<locked>> | 86% | 40,930 psi | 88% | 2710 fps | 99.3% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 37,014 psi | 80% | 2828 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 26,701 psi | 58% | 1788 fps | 100% |
| IMR 4227 | <<locked>> | 94% | 41,408 psi | 89% | 2802 fps | 96.8% |
| Lovex S053 | <<locked>> | 96% | 41,336 psi | 89% | 2822 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 25,773 psi | 56% | 1824 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 96% | 41,872 psi | 90% | 2861 fps | 96.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 98% | 40,698 psi | 88% | 2694 fps | 100% |
| Vihtavuori N110 | <<locked>> | 90% | 41,147 psi | 89% | 2776 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 37,521 psi | 81% | 2802 fps | 98.4% |
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% | 35,679 psi | 77% | 2684 fps | 96.9% |
| ADI AR 2205 | <<locked>> | 80% | 33,649 psi | 73% | 2559 fps | 98% |
| ADI AR 2207 | <<locked>> | 94% | 30,922 psi | 67% | 2680 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 19,348 psi | 42% | 1601 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 36,666 psi | 79% | 2703 fps | 95.5% |
| Lovex S053 | 11.9 gr | 80% | 25,541 psi | 55% | 2441 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 18,797 psi | 41% | 1640 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 37,231 psi | 80% | 2766 fps | 95.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 24,468 psi | 53% | 2343 fps | 99.9% |
| Vihtavuori N110 | 11.4 gr | 80% | 30,472 psi | 66% | 2559 fps | 100% |
| Vihtavuori N120 | 14 gr | 90% | 28,007 psi | 60% | 2566 fps | 95.2% |
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 | Fox Classic Hunter. ReloadSwiss RS 36 delivers the highest muzzle velocity at 2,861 fps; across all powders the maximum-charge window runs from 1,788 fps to 2,861 fps. ADI AR 2207 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 56–90 %, leaving at least 10 % headroom. The 50.0 gr projectile in 0.224" 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. Lovex S053, Vihtavuori N110, Vihtavuori N120 rank at the top here: for .221 Rem. Fireball with the .224 | 50gr | Fox Classic Hunter 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.