Load Specifications
Load data in caliber .221 Rem. Fireball with .224 | 70gr | Berger LTB bullet and 17 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma 200, ADI AR 2207 and Alliant Reloder-7.
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>> | 88% | 40,321 psi | 87% | 2359 fps | 97.4% |
| ADI AR 2207 | <<locked>> | 94% | 41,162 psi | 89% | 2464 fps | 99.9% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 32,851 psi | 71% | 2352 fps | 96.5% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 40,379 psi | 87% | 2474 fps | 97.8% |
| Alliant Reloder-7 | <<locked>> | 92% | 41,278 psi | 89% | 2421 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 29,327 psi | 63% | 1506 fps | 100% |
| IMR 4198 | <<locked>> | 98% | 41,814 psi | 90% | 2434 fps | 98.6% |
| IMR 4227 | <<locked>> | 86% | 40,567 psi | 87% | 2359 fps | 99.4% |
| Lovex S053 | <<locked>> | 86% | 39,624 psi | 85% | 2339 fps | 100% |
| Norma 200 | <<locked>> | 96% | 40,321 psi | 87% | 2461 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,805 psi | 62% | 1542 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 88% | 41,930 psi | 90% | 2425 fps | 99.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 90% | 41,336 psi | 89% | 2241 fps | 100% |
| SNPE Vectan SP 3ᴾ | <<locked>> | 100% | 41,989 psi | 90% | 2461 fps | 95.8% |
| Vihtavuori N110 | <<locked>> | 82% | 41,582 psi | 90% | 2306 fps | 100% |
| Vihtavuori N120 | <<locked>> | 94% | 41,379 psi | 89% | 2428 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 39,233 psi | 85% | 2385 fps | 97.1% |
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>> | 82% | 33,098 psi | 71% | 2221 fps | 95.4% |
| ADI AR 2207 | 11.8 gr | 80% | 26,556 psi | 57% | 2162 fps | 97.4% |
| Alliant AR-Comp | <<locked>> | 98% | 30,980 psi | 67% | 2306 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 92% | 31,531 psi | 68% | 2297 fps | 95.2% |
| Alliant Reloder-7 | 12.5 gr | 82% | 29,979 psi | 65% | 2195 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,857 psi | 47% | 1355 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 29,936 psi | 65% | 2188 fps | 95.2% |
| IMR 4227 | <<locked>> | 80% | 34,345 psi | 74% | 2241 fps | 98.3% |
| Lovex S053 | <<locked>> | 80% | 32,967 psi | 71% | 2215 fps | 99.8% |
| Norma 200 | 13.3 gr | 86% | 29,747 psi | 64% | 2247 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,929 psi | 45% | 1375 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 32,953 psi | 71% | 2254 fps | 97.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 31,618 psi | 68% | 2083 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 98% | 39,523 psi | 85% | 2418 fps | 95.1% |
| Vihtavuori N110 | <<locked>> | 80% | 38,986 psi | 84% | 2264 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 26,934 psi | 58% | 2142 fps | 98.5% |
| Vihtavuori N130 | <<locked>> | 94% | 33,475 psi | 72% | 2274 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 17 powders for .221 Rem. Fireball loaded with the .224 | 70gr | Berger LTB. Alliant Reloder-10x delivers the highest muzzle velocity at 2,474 fps; across all powders the maximum-charge window runs from 1,506 fps to 2,474 fps. Alliant AR-Comp gives the best case fill at 100 %, and 17 of the 17 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 70.0 gr projectile in 0.224" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Alliant AR-Comp, Alliant Reloder-10x, Hodgdon TrailBoss 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. Norma 200, ADI AR 2207, Alliant Reloder-7 rank at the top here: for .221 Rem. Fireball with the .224 | 70gr | Berger LTB 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.