Load Specifications
Load data in caliber .221 Rem. Fireball with .227 | 50gr | Impala LWHV LS 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>> | 82% | 40,611 psi | 88% | 2720 fps | 97.5% |
| ADI AR 2205 | <<locked>> | 84% | 40,219 psi | 87% | 2635 fps | 98.9% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 39,697 psi | 86% | 2822 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,108 psi | 61% | 1762 fps | 100% |
| IMR 4227 | <<locked>> | 92% | 40,611 psi | 88% | 2723 fps | 95.9% |
| Lovex S053 | <<locked>> | 94% | 41,118 psi | 89% | 2753 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,586 psi | 59% | 1801 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 94% | 41,742 psi | 90% | 2795 fps | 96.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 96% | 40,770 psi | 88% | 2638 fps | 100% |
| Vihtavuori N110 | <<locked>> | 88% | 41,292 psi | 89% | 2717 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 40,118 psi | 86% | 2789 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% | 38,406 psi | 83% | 2677 fps | 97% |
| ADI AR 2205 | <<locked>> | 80% | 35,897 psi | 77% | 2546 fps | 98.1% |
| ADI AR 2207 | <<locked>> | 94% | 33,533 psi | 72% | 2680 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,219 psi | 46% | 1588 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 38,319 psi | 83% | 2677 fps | 95.2% |
| Lovex S053 | 11.4 gr | 80% | 28,732 psi | 62% | 2461 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,334 psi | 44% | 1611 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 39,566 psi | 85% | 2749 fps | 95.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 27,253 psi | 59% | 2349 fps | 100% |
| Vihtavuori N110 | 10.8 gr | 80% | 33,127 psi | 71% | 2549 fps | 100% |
| Vihtavuori N120 | 13.3 gr | 90% | 30,385 psi | 65% | 2559 fps | 95.4% |
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 11 powders for .221 Rem. Fireball loaded with the .227 | 50gr | Impala LWHV LS. ADI AR 2207 delivers the highest muzzle velocity at 2,822 fps; across all powders the maximum-charge window runs from 1,762 fps to 2,822 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 59–90 %, leaving at least 10 % headroom. The 50.0 gr projectile in 0.227" calls for a 1:8.5 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 .227 | 50gr | Impala LWHV LS 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.