Load Specifications
Load data in caliber .221 Rem. Fireball with .224 | 51gr | Peregrine VLR-4 bullet and 12 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>> | 82% | 39,146 psi | 84% | 2720 fps | 97.9% |
| ADI AR 2205 | <<locked>> | 84% | 39,769 psi | 86% | 2651 fps | 99.2% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 38,522 psi | 83% | 2828 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 26,905 psi | 58% | 1762 fps | 100% |
| IMR 4227 | <<locked>> | 92% | 40,190 psi | 87% | 2746 fps | 96.6% |
| Lovex S053 | <<locked>> | 94% | 40,364 psi | 87% | 2766 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 26,803 psi | 58% | 1814 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 94% | 40,901 psi | 88% | 2808 fps | 96.7% |
| Shooters World SOCOM | <<locked>> | 86% | 41,771 psi | 90% | 2753 fps | 95.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 98% | 41,191 psi | 89% | 2664 fps | 100% |
| Vihtavuori N110 | <<locked>> | 88% | 40,001 psi | 86% | 2717 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 39,059 psi | 84% | 2795 fps | 98.8% |
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% | 36,956 psi | 80% | 2674 fps | 97.3% |
| ADI AR 2205 | <<locked>> | 80% | 34,722 psi | 75% | 2549 fps | 98.4% |
| ADI AR 2207 | <<locked>> | 92% | 30,429 psi | 66% | 2631 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 19,522 psi | 42% | 1575 fps | 100% |
| IMR 4227 | <<locked>> | 88% | 35,665 psi | 77% | 2648 fps | 95.3% |
| Lovex S053 | 11.8 gr | 80% | 26,629 psi | 57% | 2438 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 19,102 psi | 41% | 1614 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 90% | 35,737 psi | 77% | 2697 fps | 95.2% |
| Shooters World SOCOM | <<locked>> | 84% | 38,624 psi | 83% | 2690 fps | 95% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 25,454 psi | 55% | 2333 fps | 100% |
| Vihtavuori N110 | 11.3 gr | 80% | 31,705 psi | 68% | 2549 fps | 100% |
| Vihtavuori N120 | 13.9 gr | 90% | 29,196 psi | 63% | 2566 fps | 95.9% |
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 .224 | 51gr | Peregrine VLR-4. ADI AR 2207 delivers the highest muzzle velocity at 2,828 fps; across all powders the maximum-charge window runs from 1,762 fps to 2,828 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 51.0 gr projectile in 0.224" calls for a 1:9.0 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 | 51gr | Peregrine VLR-4 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.