Load Specifications
Load data in caliber .221 Rem. Fireball with .224 | 55gr | Barnes TTSX BT bullet and 28 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 36, Lovex S053 and IMR 4227.
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% | 39,494 psi | 85% | 2621 fps | 98.4% |
| Accurate No. 11 FS | <<locked>> | 82% | 39,494 psi | 85% | 2621 fps | 98.4% |
| ADI AR 2205 | <<locked>> | 86% | 41,568 psi | 90% | 2579 fps | 99.7% |
| ADI AR 2205 | <<locked>> | 86% | 41,568 psi | 90% | 2579 fps | 99.7% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 38,566 psi | 83% | 2720 fps | 98.2% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 38,566 psi | 83% | 2720 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 26,861 psi | 58% | 1680 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 26,861 psi | 58% | 1680 fps | 100% |
| IMR 4227 | <<locked>> | 92% | 39,827 psi | 86% | 2631 fps | 97.1% |
| IMR 4227 | <<locked>> | 92% | 39,827 psi | 86% | 2631 fps | 97.1% |
| Lovex D060 | <<locked>> | 86% | 41,945 psi | 90% | 2680 fps | 95.8% |
| Lovex D060 | <<locked>> | 86% | 41,945 psi | 90% | 2680 fps | 95.8% |
| Lovex S053 | <<locked>> | 94% | 39,885 psi | 86% | 2648 fps | 99.5% |
| Lovex S053 | <<locked>> | 94% | 39,885 psi | 86% | 2648 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 26,034 psi | 56% | 1716 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 26,034 psi | 56% | 1716 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 94% | 40,059 psi | 86% | 2684 fps | 97% |
| ReloadSwiss RS 36 | <<locked>> | 94% | 40,059 psi | 86% | 2684 fps | 97% |
| Shooters World Buffalo Rifle | <<locked>> | 86% | 41,945 psi | 90% | 2680 fps | 95.8% |
| Shooters World Buffalo Rifle | <<locked>> | 86% | 41,945 psi | 90% | 2680 fps | 95.8% |
| Shooters World SOCOM | <<locked>> | 86% | 41,655 psi | 90% | 2644 fps | 96.5% |
| Shooters World SOCOM | <<locked>> | 86% | 41,655 psi | 90% | 2644 fps | 96.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 98% | 41,379 psi | 89% | 2552 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 98% | 41,379 psi | 89% | 2552 fps | 100% |
| Vihtavuori N110 | <<locked>> | 88% | 39,856 psi | 86% | 2602 fps | 100% |
| Vihtavuori N110 | <<locked>> | 88% | 39,856 psi | 86% | 2602 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 39,030 psi | 84% | 2690 fps | 99.1% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 39,030 psi | 84% | 2690 fps | 99.1% |
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 No. 11 FS | <<locked>> | 80% | 36,390 psi | 78% | 2559 fps | 97.7% |
| Accurate No. 11 FS | <<locked>> | 80% | 36,390 psi | 78% | 2559 fps | 97.7% |
| ADI AR 2205 | <<locked>> | 80% | 34,534 psi | 74% | 2444 fps | 98.7% |
| ADI AR 2205 | <<locked>> | 80% | 34,534 psi | 74% | 2444 fps | 98.7% |
| ADI AR 2207 | <<locked>> | 92% | 30,008 psi | 65% | 2526 fps | 95.6% |
| ADI AR 2207 | <<locked>> | 92% | 30,008 psi | 65% | 2526 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 19,783 psi | 43% | 1512 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 19,783 psi | 43% | 1512 fps | 100% |
| IMR 4227 | 12.7 gr | 88% | 35,099 psi | 76% | 2533 fps | 95.7% |
| IMR 4227 | 12.7 gr | 88% | 35,099 psi | 76% | 2533 fps | 95.7% |
| Lovex D060 | <<locked>> | 84% | 39,508 psi | 85% | 2628 fps | 95% |
| Lovex D060 | <<locked>> | 84% | 39,508 psi | 85% | 2628 fps | 95% |
| Lovex S053 | 11.3 gr | 80% | 26,223 psi | 56% | 2333 fps | 96.2% |
| Lovex S053 | 11.3 gr | 80% | 26,223 psi | 56% | 2333 fps | 96.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 18,637 psi | 40% | 1529 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 18,637 psi | 40% | 1529 fps | 100% |
| ReloadSwiss RS 36 | 13.5 gr | 88% | 33,301 psi | 72% | 2539 fps | 95% |
| ReloadSwiss RS 36 | 13.5 gr | 88% | 33,301 psi | 72% | 2539 fps | 95% |
| Shooters World Buffalo Rifle | <<locked>> | 84% | 39,508 psi | 85% | 2628 fps | 95% |
| Shooters World Buffalo Rifle | <<locked>> | 84% | 39,508 psi | 85% | 2628 fps | 95% |
| Shooters World SOCOM | <<locked>> | 84% | 38,377 psi | 83% | 2582 fps | 95.6% |
| Shooters World SOCOM | <<locked>> | 84% | 38,377 psi | 83% | 2582 fps | 95.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 25,382 psi | 55% | 2238 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 25,382 psi | 55% | 2238 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 31,125 psi | 67% | 2431 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 31,125 psi | 67% | 2431 fps | 100% |
| Vihtavuori N120 | <<locked>> | 88% | 27,035 psi | 58% | 2408 fps | 95.6% |
| Vihtavuori N120 | <<locked>> | 88% | 27,035 psi | 58% | 2408 fps | 95.6% |
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 28 powders for .221 Rem. Fireball loaded with the .224 | 55gr | Barnes TTSX BT. ADI AR 2207 delivers the highest muzzle velocity at 2,720 fps; across all powders the maximum-charge window runs from 1,680 fps to 2,720 fps. ADI AR 2207 gives the best case fill at 100 %, and 28 of the 28 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 55.0 gr projectile in 0.224" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. ADI AR 2207, ADI AR 2207, 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. ReloadSwiss RS 36, Lovex S053, IMR 4227 rank at the top here: for .221 Rem. Fireball with the .224 | 55gr | Barnes TTSX BT 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.