Load Specifications
Load data in caliber 7.21 Firebird with .284 | 150gr | Norma Soft Point bullet and 49 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 and Alliant Reloder-33.
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% | 58,363 psi | 87% | 3091 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 55,230 psi | 83% | 3140 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 82% | 57,682 psi | 86% | 3209 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 82% | 58,914 psi | 88% | 3182 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 58,059 psi | 87% | 3202 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 58,073 psi | 87% | 3189 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 59,292 psi | 89% | 3333 fps | 99.6% |
| ADI AR 2225 | <<locked>> | 94% | 58,204 psi | 87% | 3212 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 58,566 psi | 88% | 3169 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 58,624 psi | 88% | 3196 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 57,043 psi | 86% | 3094 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 58,204 psi | 87% | 3176 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 57,305 psi | 86% | 3235 fps | 99.1% |
| Alliant Reloder-50 | <<locked>> | 96% | 57,812 psi | 87% | 3232 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 58,088 psi | 87% | 3159 fps | 99.3% |
| Bofors RP15 | <<locked>> | 86% | 58,189 psi | 87% | 3186 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 58,160 psi | 87% | 3205 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 58,624 psi | 88% | 3196 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 59,509 psi | 89% | 3205 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,463 psi | 85% | 3130 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 84% | 59,263 psi | 89% | 3173 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 58,218 psi | 87% | 3281 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,043 psi | 57% | 2064 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 60,046 psi | 90% | 3163 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 56,898 psi | 85% | 3189 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 58,987 psi | 88% | 3120 fps | 97% |
| IMR 8133 Enduron | <<locked>> | 96% | 57,087 psi | 86% | 3199 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 56,898 psi | 85% | 3068 fps | 100% |
| Norma 217 | <<locked>> | 96% | 58,726 psi | 88% | 3222 fps | 100% |
| Norma MRP | <<locked>> | 82% | 58,987 psi | 88% | 3209 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 58,639 psi | 88% | 3215 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 57,087 psi | 86% | 3133 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,117 psi | 59% | 2113 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 59,306 psi | 89% | 3258 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 58,334 psi | 87% | 3235 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 59,045 psi | 89% | 3150 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 58,436 psi | 88% | 3163 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 56,739 psi | 85% | 3146 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 58,073 psi | 87% | 3159 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 58,668 psi | 88% | 3123 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 59,045 psi | 89% | 3114 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 58,755 psi | 88% | 3156 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 82% | 58,552 psi | 88% | 3123 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 58,131 psi | 87% | 3219 fps | 100% |
| Vihtavuori N565 | <<locked>> | 88% | 59,988 psi | 90% | 3219 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 58,421 psi | 88% | 3235 fps | 99.8% |
| Vihtavuori N570 | <<locked>> | 92% | 60,278 psi | 90% | 3314 fps | 99.2% |
| Winchester StaBALL HD | <<locked>> | 84% | 58,943 psi | 88% | 3192 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 58,668 psi | 88% | 3123 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% | 51,039 psi | 77% | 2976 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 44,193 psi | 66% | 2933 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 80% | 53,766 psi | 81% | 3143 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 80% | 55,085 psi | 83% | 3120 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 50,531 psi | 76% | 3074 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 80% | 37,956 psi | 57% | 2805 fps | 97.8% |
| ADI AR 2218 | 96.1 gr | 86% | 40,741 psi | 61% | 2946 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 35,244 psi | 53% | 2776 fps | 99.4% |
| Alliant Reloder-19 | <<locked>> | 80% | 54,839 psi | 82% | 3110 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 51,271 psi | 77% | 3074 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,995 psi | 75% | 2986 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 44,106 psi | 66% | 2943 fps | 100% |
| Alliant Reloder-33 | 95.6 gr | 84% | 42,380 psi | 64% | 2940 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 88% | 42,815 psi | 64% | 2936 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,776 psi | 72% | 2976 fps | 97.6% |
| Bofors RP15 | <<locked>> | 80% | 47,761 psi | 72% | 3009 fps | 99.8% |
| Bofors RP30 | <<locked>> | 80% | 41,263 psi | 62% | 2887 fps | 98.6% |
| Bofors RP5 | <<locked>> | 80% | 51,271 psi | 77% | 3074 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 41,379 psi | 62% | 2884 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 80% | 52,808 psi | 79% | 3068 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,808 psi | 78% | 3048 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 80% | 43,366 psi | 65% | 3012 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,674 psi | 43% | 1854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,823 psi | 79% | 3041 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 80% | 49,458 psi | 74% | 3061 fps | 99.6% |
| IMR 7977 Enduron | <<locked>> | 86% | 51,735 psi | 78% | 2992 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,895 psi | 49% | 2687 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 43,947 psi | 66% | 2848 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,431 psi | 50% | 2717 fps | 98% |
| Norma MRP | <<locked>> | 80% | 54,969 psi | 82% | 3146 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 50,430 psi | 76% | 3081 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 45,513 psi | 68% | 2940 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,443 psi | 44% | 1896 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 43,439 psi | 65% | 2989 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,885 psi | 60% | 2874 fps | 97% |
| Rottweil R 904 | <<locked>> | 80% | 55,274 psi | 83% | 3087 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 54,824 psi | 82% | 3107 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 43,076 psi | 65% | 2887 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 54,476 psi | 82% | 3100 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 54,955 psi | 82% | 3068 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 48,428 psi | 73% | 2943 fps | 100% |
| Vihtavuori N170 | <<locked>> | 84% | 47,877 psi | 72% | 2959 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 80% | 54,969 psi | 82% | 3071 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 54,230 psi | 81% | 3153 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 80% | 45,716 psi | 69% | 2963 fps | 99% |
| Vihtavuori N568 | <<locked>> | 80% | 40,770 psi | 61% | 2890 fps | 96.7% |
| Vihtavuori N570 | 91.9 gr | 84% | 45,049 psi | 68% | 3022 fps | 96.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 50,633 psi | 76% | 3068 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 51,082 psi | 77% | 3005 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 49 powders for 7.21 Firebird loaded with the .284 | 150gr | Norma Soft Point. ADI AR 2218 delivers the highest muzzle velocity at 3,333 fps; across all powders the maximum-charge window runs from 2,064 fps to 3,333 fps. Accurate 8700 gives the best case fill at 100 %, and 49 of the 49 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 1:12.5 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, Vihtavuori N570, Alliant Reloder-33 rank at the top here: for 7.21 Firebird with the .284 | 150gr | 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.