Load Specifications
Load data in caliber .221 Rem. Fireball with .224 | 62gr | Sierra GameKing bullet and 15 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2207, Norma 200 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 1680 | <<locked>> | 90% | 41,307 psi | 89% | 2539 fps | 96.7% |
| ADI AR 2207 | <<locked>> | 96% | 41,394 psi | 89% | 2648 fps | 99.7% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 38,551 psi | 83% | 2608 fps | 96.4% |
| Alliant Reloder-7 | <<locked>> | 94% | 41,495 psi | 89% | 2595 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,747 psi | 62% | 1624 fps | 100% |
| IMR 4198 | <<locked>> | 98% | 40,059 psi | 86% | 2569 fps | 97.5% |
| IMR 4227 | <<locked>> | 88% | 41,843 psi | 90% | 2552 fps | 99% |
| Lovex S053 | <<locked>> | 88% | 40,103 psi | 86% | 2523 fps | 100% |
| Norma 200 | <<locked>> | 98% | 41,539 psi | 90% | 2654 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,863 psi | 62% | 1673 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 88% | 40,205 psi | 87% | 2569 fps | 98.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 92% | 41,423 psi | 89% | 2418 fps | 100% |
| Vihtavuori N110 | <<locked>> | 82% | 40,263 psi | 87% | 2467 fps | 100% |
| Vihtavuori N120 | <<locked>> | 96% | 41,669 psi | 90% | 2612 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 37,652 psi | 81% | 2520 fps | 95.7% |
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>> | 86% | 36,230 psi | 78% | 2444 fps | 95.3% |
| ADI AR 2207 | 12.5 gr | 80% | 25,382 psi | 55% | 2280 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 96% | 34,287 psi | 74% | 2520 fps | 95.1% |
| Alliant Reloder-7 | <<locked>> | 88% | 35,012 psi | 75% | 2467 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,132 psi | 46% | 1453 fps | 100% |
| IMR 4198 | <<locked>> | 92% | 33,895 psi | 73% | 2438 fps | 95.6% |
| IMR 4227 | <<locked>> | 80% | 33,025 psi | 71% | 2379 fps | 97.1% |
| Lovex S053 | <<locked>> | 80% | 31,792 psi | 69% | 2356 fps | 99.3% |
| Norma 200 | 14.7 gr | 90% | 31,720 psi | 68% | 2454 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,798 psi | 45% | 1490 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 31,328 psi | 68% | 2382 fps | 96.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 30,284 psi | 65% | 2221 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 37,884 psi | 82% | 2425 fps | 100% |
| Vihtavuori N120 | 12.5 gr | 80% | 25,730 psi | 55% | 2260 fps | 97.2% |
| Vihtavuori N130 | <<locked>> | 98% | 35,563 psi | 77% | 2477 fps | 95% |
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 15 powders for .221 Rem. Fireball loaded with the .224 | 62gr | Sierra GameKing. Norma 200 delivers the highest muzzle velocity at 2,654 fps; across all powders the maximum-charge window runs from 1,624 fps to 2,654 fps. Alliant Reloder-10x gives the best case fill at 100 %, and 15 of the 15 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (320 MPa), the top charges use 62–90 %, leaving at least 10 % headroom. The 62.0 gr projectile in 0.224" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-10x, 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. ADI AR 2207, Norma 200, Vihtavuori N120 rank at the top here: for .221 Rem. Fireball with the .224 | 62gr | Sierra GameKing 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.