Load Specifications
Load data in caliber 7.21 Firebird with .284 | 145gr | Brenneke Teilmantel bullet and 50 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% | 57,957 psi | 87% | 3130 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 54,911 psi | 82% | 3173 fps | 98.3% |
| Accurate MAGPRO | <<locked>> | 82% | 57,334 psi | 86% | 3248 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 82% | 58,595 psi | 88% | 3222 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 57,783 psi | 87% | 3245 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 57,754 psi | 87% | 3228 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 59,045 psi | 89% | 3369 fps | 99.5% |
| ADI AR 2225 | <<locked>> | 94% | 58,001 psi | 87% | 3251 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 58,204 psi | 87% | 3209 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 58,334 psi | 87% | 3235 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,681 psi | 85% | 3133 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 57,827 psi | 87% | 3215 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 56,927 psi | 85% | 3268 fps | 98.9% |
| Alliant Reloder-50 | <<locked>> | 96% | 57,493 psi | 86% | 3268 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,899 psi | 87% | 3199 fps | 99.2% |
| Bofors RP15 | <<locked>> | 86% | 57,899 psi | 87% | 3228 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 57,711 psi | 87% | 3238 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 58,334 psi | 87% | 3235 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 59,234 psi | 89% | 3248 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 60,118 psi | 90% | 3228 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 84% | 59,001 psi | 88% | 3215 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 57,783 psi | 87% | 3317 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,029 psi | 57% | 2103 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 59,857 psi | 90% | 3202 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 56,405 psi | 85% | 3225 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 58,639 psi | 88% | 3153 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 96% | 56,724 psi | 85% | 3235 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 60,162 psi | 90% | 3159 fps | 100% |
| Norma 217 | <<locked>> | 96% | 58,465 psi | 88% | 3258 fps | 100% |
| Norma MRP | <<locked>> | 82% | 58,697 psi | 88% | 3248 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 58,247 psi | 87% | 3255 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 56,797 psi | 85% | 3173 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,088 psi | 59% | 2149 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 58,871 psi | 88% | 3297 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 58,030 psi | 87% | 3271 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 82% | 58,740 psi | 88% | 3189 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 58,088 psi | 87% | 3202 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 56,521 psi | 85% | 3182 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,725 psi | 87% | 3199 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 60,249 psi | 90% | 3176 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 58,479 psi | 88% | 3166 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 58,769 psi | 88% | 3156 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 58,436 psi | 88% | 3192 fps | 98% |
| Vihtavuori N555 | <<locked>> | 82% | 58,233 psi | 87% | 3163 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 57,856 psi | 87% | 3258 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 59,756 psi | 90% | 3258 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 58,044 psi | 87% | 3271 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 92% | 59,799 psi | 90% | 3346 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 84% | 58,494 psi | 88% | 3232 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 58,378 psi | 88% | 3166 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% | 50,763 psi | 76% | 3015 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 43,918 psi | 66% | 2963 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 80% | 53,519 psi | 80% | 3182 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 80% | 54,795 psi | 82% | 3159 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 50,227 psi | 75% | 3110 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 80% | 37,710 psi | 57% | 2835 fps | 97.5% |
| ADI AR 2218 | 99.9 gr | 88% | 43,526 psi | 65% | 3054 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 34,998 psi | 52% | 2805 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 54,563 psi | 82% | 3150 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,966 psi | 76% | 3110 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,603 psi | 74% | 3022 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,816 psi | 66% | 2979 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 41,974 psi | 63% | 2966 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 90% | 45,919 psi | 69% | 3041 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,427 psi | 71% | 3005 fps | 97.3% |
| Bofors RP15 | <<locked>> | 80% | 47,500 psi | 71% | 3045 fps | 99.7% |
| Bofors RP30 | <<locked>> | 80% | 41,002 psi | 61% | 2920 fps | 98.4% |
| Bofors RP5 | <<locked>> | 80% | 50,966 psi | 76% | 3110 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 41,089 psi | 62% | 2920 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 80% | 52,504 psi | 79% | 3104 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,532 psi | 77% | 3087 fps | 99.4% |
| Hodgdon Retumbo | 85.7 gr | 80% | 42,989 psi | 64% | 3048 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,558 psi | 43% | 1886 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,605 psi | 79% | 3084 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 80% | 49,139 psi | 74% | 3097 fps | 99.5% |
| IMR 7977 Enduron | <<locked>> | 86% | 51,517 psi | 77% | 3028 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,561 psi | 49% | 2713 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 43,671 psi | 65% | 2884 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,199 psi | 50% | 2746 fps | 97.7% |
| Norma MRP | <<locked>> | 80% | 54,737 psi | 82% | 3186 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 50,024 psi | 75% | 3114 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 80% | 45,266 psi | 68% | 2976 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,428 psi | 44% | 1932 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 43,120 psi | 65% | 3022 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,581 psi | 59% | 2904 fps | 96.6% |
| Rottweil R 904 | <<locked>> | 80% | 55,056 psi | 83% | 3127 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 54,389 psi | 82% | 3143 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 45,919 psi | 69% | 2982 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 54,027 psi | 81% | 3136 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 56,304 psi | 84% | 3114 fps | 99.8% |
| Somchem S385 | <<locked>> | 80% | 54,665 psi | 82% | 3107 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 48,138 psi | 72% | 2979 fps | 100% |
| Vihtavuori N170 | <<locked>> | 84% | 47,601 psi | 71% | 2992 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 54,549 psi | 82% | 3107 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 53,998 psi | 81% | 3192 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 80% | 45,368 psi | 68% | 2999 fps | 98.7% |
| Vihtavuori N568 | <<locked>> | 80% | 40,524 psi | 61% | 2923 fps | 96.3% |
| Vihtavuori N570 | 93.4 gr | 84% | 44,686 psi | 67% | 3051 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 50,328 psi | 75% | 3110 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,778 psi | 76% | 3038 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 50 powders for 7.21 Firebird loaded with the .284 | 145gr | Brenneke Teilmantel. ADI AR 2218 delivers the highest muzzle velocity at 3,369 fps; across all powders the maximum-charge window runs from 2,103 fps to 3,369 fps. Accurate 8700 gives the best case fill at 100 %, and 50 of the 50 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 145.0 gr projectile in 0.284" calls for a 1:13.0 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 | 145gr | Brenneke Teilmantel 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.