Load Specifications
Load data in caliber 7.21 Firebird with .284 | 150gr | Nosler Ballistic Tip Hunting bullet and 52 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Hodgdon Retumbo and Vihtavuori N570.
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>> | 84% | 57,159 psi | 86% | 3074 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 53,751 psi | 81% | 3117 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 82% | 56,507 psi | 85% | 3192 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 82% | 57,856 psi | 87% | 3166 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 57,000 psi | 85% | 3189 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 56,695 psi | 85% | 3169 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 57,725 psi | 87% | 3310 fps | 99.5% |
| ADI AR 2225 | <<locked>> | 94% | 56,594 psi | 85% | 3192 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,522 psi | 86% | 3153 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,580 psi | 86% | 3179 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 59,698 psi | 89% | 3130 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,782 psi | 85% | 3156 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 59,988 psi | 90% | 3281 fps | 99.4% |
| Alliant Reloder-50 | <<locked>> | 98% | 60,336 psi | 90% | 3278 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,029 psi | 85% | 3143 fps | 99.1% |
| Bofors RP15 | <<locked>> | 86% | 56,971 psi | 85% | 3169 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,782 psi | 85% | 3186 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,580 psi | 86% | 3179 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 58,102 psi | 87% | 3189 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 59,248 psi | 89% | 3173 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 84% | 58,291 psi | 87% | 3156 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,623 psi | 85% | 3261 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,087 psi | 57% | 2060 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 59,146 psi | 89% | 3146 fps | 100% |
| IMR 7828 SSC | <<locked>> | 86% | 59,654 psi | 89% | 3235 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,885 psi | 87% | 3100 fps | 96.6% |
| IMR 8133 Enduron | <<locked>> | 98% | 59,451 psi | 89% | 3241 fps | 100% |
| Lovex D100 | <<locked>> | 94% | 59,799 psi | 90% | 3153 fps | 96.1% |
| Lovex S071 | <<locked>> | 90% | 59,422 psi | 89% | 3104 fps | 100% |
| Norma 217 | <<locked>> | 96% | 57,305 psi | 86% | 3202 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,711 psi | 87% | 3192 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 57,116 psi | 86% | 3196 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 60,075 psi | 90% | 3179 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,030 psi | 59% | 2106 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 57,653 psi | 86% | 3241 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,681 psi | 85% | 3209 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 82% | 58,044 psi | 87% | 3133 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,363 psi | 86% | 3146 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 94% | 59,799 psi | 90% | 3153 fps | 96.1% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,332 psi | 83% | 3127 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,000 psi | 85% | 3143 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 59,553 psi | 89% | 3120 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,653 psi | 86% | 3110 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,928 psi | 87% | 3100 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,464 psi | 86% | 3136 fps | 98% |
| Vihtavuori N555 | <<locked>> | 82% | 57,435 psi | 86% | 3107 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,956 psi | 85% | 3199 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 58,697 psi | 88% | 3199 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 56,956 psi | 85% | 3215 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 92% | 58,740 psi | 88% | 3291 fps | 99% |
| Winchester StaBALL HD | <<locked>> | 84% | 57,232 psi | 86% | 3173 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,551 psi | 86% | 3110 fps | 100% |
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% | 50,009 psi | 75% | 2963 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 42,859 psi | 64% | 2907 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 80% | 52,605 psi | 79% | 3123 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 80% | 54,172 psi | 81% | 3107 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 49,487 psi | 74% | 3058 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 80% | 37,043 psi | 56% | 2785 fps | 97.5% |
| ADI AR 2218 | 96.4 gr | 88% | 42,656 psi | 64% | 2999 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 34,476 psi | 52% | 2759 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,824 psi | 81% | 3094 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,227 psi | 75% | 3058 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,907 psi | 73% | 2969 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,178 psi | 65% | 2927 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 41,220 psi | 62% | 2917 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 90% | 44,715 psi | 67% | 2982 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,818 psi | 70% | 2956 fps | 97.3% |
| Bofors RP15 | <<locked>> | 80% | 46,731 psi | 70% | 2989 fps | 99.7% |
| Bofors RP30 | <<locked>> | 80% | 40,292 psi | 60% | 2867 fps | 98.3% |
| Bofors RP5 | <<locked>> | 80% | 50,227 psi | 75% | 3058 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 40,408 psi | 61% | 2867 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 80% | 51,663 psi | 77% | 3048 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,807 psi | 76% | 3031 fps | 99.4% |
| Hodgdon Retumbo | 82.8 gr | 80% | 42,351 psi | 63% | 2995 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,543 psi | 43% | 1844 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,069 psi | 78% | 3031 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 80% | 48,370 psi | 73% | 3041 fps | 99.5% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,317 psi | 81% | 3038 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 80% | 31,981 psi | 48% | 2664 fps | 95.1% |
| Lovex D100 | <<locked>> | 92% | 55,651 psi | 83% | 3084 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 43,062 psi | 65% | 2835 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,561 psi | 49% | 2697 fps | 97.6% |
| Norma MRP | <<locked>> | 80% | 53,882 psi | 81% | 3130 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 49,298 psi | 74% | 3061 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 80% | 44,512 psi | 67% | 2923 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,443 psi | 44% | 1890 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,206 psi | 63% | 2969 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,841 psi | 58% | 2851 fps | 96.5% |
| Rottweil R 904 | <<locked>> | 80% | 54,259 psi | 81% | 3071 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 53,737 psi | 81% | 3087 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 55,651 psi | 83% | 3084 fps | 95.1% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 44,933 psi | 67% | 2930 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,388 psi | 80% | 3084 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 55,695 psi | 83% | 3061 fps | 99.8% |
| Somchem S385 | <<locked>> | 80% | 53,954 psi | 81% | 3054 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,456 psi | 71% | 2927 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 46,920 psi | 70% | 2943 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 53,838 psi | 81% | 3054 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 53,185 psi | 80% | 3133 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 80% | 44,585 psi | 67% | 2943 fps | 98.7% |
| Vihtavuori N568 | <<locked>> | 80% | 39,682 psi | 59% | 2867 fps | 96.2% |
| Vihtavuori N570 | 90.2 gr | 84% | 43,932 psi | 66% | 2999 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,327 psi | 74% | 3054 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,140 psi | 75% | 2989 fps | 100% |
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 52 powders for 7.21 Firebird loaded with the .284 | 150gr | Nosler Ballistic Tip Hunting. ADI AR 2218 delivers the highest muzzle velocity at 3,310 fps; across all powders the maximum-charge window runs from 2,060 fps to 3,310 fps. Accurate 8700 gives the best case fill at 100 %, and 52 of the 52 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (460 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, 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 2218, Hodgdon Retumbo, Vihtavuori N570 rank at the top here: for 7.21 Firebird with the .284 | 150gr | Nosler Ballistic Tip Hunting 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.