Load Specifications
Load data in caliber 7.21 Firebird with .284 | 110gr | Norma Soft Point bullet and 63 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 56,594 psi | 85% | 3445 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 59,843 psi | 90% | 3619 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 86% | 57,566 psi | 86% | 3543 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 90% | 60,365 psi | 90% | 3622 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 98% | 59,437 psi | 89% | 3586 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,521 psi | 85% | 3622 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 58,508 psi | 88% | 3606 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,319 psi | 86% | 3543 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,159 psi | 86% | 3530 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,666 psi | 85% | 3547 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 58,407 psi | 88% | 3514 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 59,146 psi | 89% | 3586 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 59,857 psi | 90% | 3612 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 58,291 psi | 87% | 3602 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,000 psi | 85% | 3494 fps | 97.1% |
| Bofors RP15 | <<locked>> | 92% | 59,843 psi | 90% | 3599 fps | 99.8% |
| Bofors RP30 | <<locked>> | 96% | 59,059 psi | 89% | 3596 fps | 99.6% |
| Bofors RP5 | <<locked>> | 88% | 56,666 psi | 85% | 3547 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 94% | 56,811 psi | 85% | 3543 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 88% | 59,146 psi | 89% | 3543 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 88% | 58,059 psi | 87% | 3524 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,493 psi | 86% | 3451 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 58,189 psi | 87% | 3681 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,550 psi | 56% | 2365 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 59,596 psi | 89% | 3520 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,681 psi | 85% | 3468 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 59,234 psi | 89% | 3520 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 90% | 58,639 psi | 88% | 3602 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,330 psi | 80% | 3497 fps | 98.9% |
| Lovex S065 | <<locked>> | 82% | 59,567 psi | 89% | 3497 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 58,160 psi | 87% | 3497 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 58,262 psi | 87% | 3471 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,479 psi | 86% | 3520 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 54,476 psi | 82% | 3527 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,753 psi | 85% | 3563 fps | 100% |
| Norma URP | <<locked>> | 82% | 58,189 psi | 87% | 3517 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 60,191 psi | 90% | 3625 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 82% | 57,450 psi | 86% | 3520 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 58,958 psi | 88% | 3540 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,464 psi | 58% | 2421 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 59,741 psi | 90% | 3593 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 60,089 psi | 90% | 3668 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 59,712 psi | 90% | 3622 fps | 99% |
| Rottweil R 904 | <<locked>> | 86% | 58,088 psi | 87% | 3510 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 86% | 56,898 psi | 85% | 3524 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 59,567 psi | 89% | 3497 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 58,160 psi | 87% | 3497 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 58,595 psi | 88% | 3442 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 60,365 psi | 90% | 3583 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 60,031 psi | 90% | 3494 fps | 99.1% |
| Somchem S365 | <<locked>> | 84% | 59,915 psi | 90% | 3517 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,305 psi | 86% | 3484 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 82% | 59,814 psi | 90% | 3507 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,392 psi | 86% | 3461 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 59,146 psi | 89% | 3507 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 60,249 psi | 90% | 3550 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,144 psi | 84% | 3556 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 92% | 57,479 psi | 86% | 3543 fps | 99% |
| Vihtavuori N568 | <<locked>> | 96% | 59,611 psi | 89% | 3622 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 96% | 56,811 psi | 85% | 3612 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 59,727 psi | 90% | 3438 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 59,146 psi | 89% | 3609 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,348 psi | 86% | 3478 fps | 99.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 42,830 psi | 64% | 3179 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 80% | 44,672 psi | 67% | 3307 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 46,746 psi | 70% | 3333 fps | 98.1% |
| ADI AR 2213 | <<locked>> | 80% | 42,018 psi | 63% | 3245 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 88% | 41,452 psi | 62% | 3219 fps | 96% |
| ADI AR 2218 | <<locked>> | 98% | 52,170 psi | 78% | 3527 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 84% | 32,996 psi | 49% | 3018 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,563 psi | 80% | 3481 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,731 psi | 70% | 3323 fps | 98.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,786 psi | 64% | 3258 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,466 psi | 62% | 3205 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,853 psi | 54% | 3104 fps | 98.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,442 psi | 71% | 3389 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 53,969 psi | 81% | 3520 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 49,995 psi | 75% | 3356 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 39,726 psi | 60% | 3176 fps | 96% |
| Bofors RP30 | <<locked>> | 86% | 41,553 psi | 62% | 3235 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 42,786 psi | 64% | 3258 fps | 97.2% |
| Hodgdon H1000 | <<locked>> | 84% | 39,305 psi | 59% | 3166 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 80% | 44,701 psi | 67% | 3255 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,859 psi | 66% | 3235 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,444 psi | 76% | 3333 fps | 100% |
| Hodgdon Retumbo | 89.4 gr | 82% | 37,579 psi | 56% | 3209 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,036 psi | 42% | 2129 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,373 psi | 79% | 3392 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 52,939 psi | 79% | 3402 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,672 psi | 68% | 3255 fps | 96.4% |
| IMR 7828 SSC | <<locked>> | 80% | 40,799 psi | 61% | 3225 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 92% | 40,132 psi | 60% | 3205 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 55,956 psi | 84% | 3438 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 54,418 psi | 82% | 3432 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 36,724 psi | 55% | 3028 fps | 97.7% |
| Norma 204 | <<locked>> | 80% | 53,476 psi | 80% | 3448 fps | 99.1% |
| Norma 217 | <<locked>> | 88% | 35,128 psi | 53% | 3087 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 45,701 psi | 69% | 3346 fps | 99% |
| Norma URP | <<locked>> | 80% | 54,346 psi | 81% | 3451 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,828 psi | 61% | 3232 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 53,577 psi | 80% | 3451 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,941 psi | 55% | 3084 fps | 96.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,776 psi | 43% | 2182 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 55,317 psi | 83% | 3520 fps | 100% |
| ReloadSwiss RS 76 | 93.4 gr | 80% | 34,606 psi | 52% | 3097 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 43,540 psi | 65% | 3287 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 47,587 psi | 71% | 3304 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 80% | 46,238 psi | 69% | 3310 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 55,956 psi | 84% | 3438 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 54,418 psi | 82% | 3432 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 54,940 psi | 82% | 3379 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,890 psi | 69% | 3304 fps | 98% |
| Somchem S361 | <<locked>> | 80% | 48,776 psi | 73% | 3284 fps | 97.1% |
| Somchem S365 | <<locked>> | 80% | 52,214 psi | 78% | 3396 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,775 psi | 70% | 3281 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 80% | 55,898 psi | 84% | 3445 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 40,814 psi | 61% | 3130 fps | 97.2% |
| Vihtavuori N550 | <<locked>> | 80% | 55,361 psi | 83% | 3445 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 46,035 psi | 69% | 3297 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,353 psi | 68% | 3330 fps | 96.1% |
| Vihtavuori N565 | <<locked>> | 84% | 43,395 psi | 65% | 3255 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 90% | 47,718 psi | 72% | 3383 fps | 95.8% |
| Vihtavuori N570 | 106.4 gr | 94% | 52,620 psi | 79% | 3527 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 55,724 psi | 84% | 3376 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,726 psi | 60% | 3248 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,207 psi | 65% | 3196 fps | 97.3% |
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 63 powders for 7.21 Firebird loaded with the .284 | 110gr | Norma Soft Point. Hodgdon Retumbo delivers the highest muzzle velocity at 3,681 fps; across all powders the maximum-charge window runs from 2,365 fps to 3,681 fps. ADI AR 2218 gives the best case fill at 100 %, and 63 of the 63 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (460 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 110.0 gr projectile in 0.284" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 7.21 Firebird with the .284 | 110gr | Norma Soft Point 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.