Load Specifications
Load data in caliber 7.21 Firebird with .284 | 160gr | Reichenberg Mag Drückjagd bullet and 53 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 IMR 8133 Enduron.
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% | 58,407 psi | 88% | 3012 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 55,883 psi | 84% | 3084 fps | 99% |
| Accurate MAGPRO | <<locked>> | 82% | 58,146 psi | 87% | 3143 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 59,509 psi | 89% | 3110 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 58,798 psi | 88% | 3136 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 58,885 psi | 88% | 3123 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 60,205 psi | 90% | 3278 fps | 99.9% |
| ADI AR 2225 | <<locked>> | 94% | 58,929 psi | 88% | 3143 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 59,088 psi | 89% | 3097 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 59,205 psi | 89% | 3127 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 57,493 psi | 86% | 3018 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 58,813 psi | 88% | 3104 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 57,812 psi | 87% | 3173 fps | 99.5% |
| Alliant Reloder-50 | <<locked>> | 96% | 57,972 psi | 87% | 3163 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 58,639 psi | 88% | 3094 fps | 99.6% |
| Bofors RP15 | <<locked>> | 86% | 58,581 psi | 88% | 3117 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 58,494 psi | 88% | 3133 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 59,205 psi | 89% | 3127 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 60,350 psi | 90% | 3140 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,840 psi | 85% | 3058 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 84% | 59,886 psi | 90% | 3104 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 59,074 psi | 89% | 3212 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,029 psi | 57% | 2001 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,797 psi | 85% | 3035 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 57,392 psi | 86% | 3120 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 59,350 psi | 89% | 3054 fps | 97.6% |
| IMR 8133 Enduron | <<locked>> | 96% | 57,566 psi | 86% | 3130 fps | 100% |
| Lovex D100 | <<locked>> | 92% | 57,217 psi | 86% | 3045 fps | 96.3% |
| Lovex S071 | <<locked>> | 88% | 56,913 psi | 85% | 2992 fps | 100% |
| Norma 217 | <<locked>> | 96% | 59,234 psi | 89% | 3150 fps | 100% |
| Norma MRP | <<locked>> | 82% | 59,625 psi | 89% | 3140 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 59,277 psi | 89% | 3146 fps | 100% |
| Ramshot LRT | <<locked>> | 96% | 59,393 psi | 89% | 3192 fps | 96.5% |
| Ramshot Magnum | <<locked>> | 86% | 57,479 psi | 86% | 3061 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,117 psi | 59% | 2047 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 60,075 psi | 90% | 3189 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 58,740 psi | 88% | 3166 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 59,524 psi | 89% | 3077 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 58,900 psi | 88% | 3091 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 57,217 psi | 86% | 3045 fps | 96.3% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 57,174 psi | 86% | 3084 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 58,537 psi | 88% | 3087 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 59,059 psi | 89% | 3054 fps | 100% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 50,546 psi | 76% | 2986 fps | 96.3% |
| Vihtavuori N165 | <<locked>> | 86% | 59,437 psi | 89% | 3045 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 59,103 psi | 89% | 3094 fps | 98.7% |
| Vihtavuori N555 | <<locked>> | 82% | 58,798 psi | 88% | 3045 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 58,813 psi | 88% | 3150 fps | 100% |
| Vihtavuori N565 | <<locked>> | 88% | 60,292 psi | 90% | 3146 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 58,987 psi | 88% | 3173 fps | 100% |
| Vihtavuori N570 | <<locked>> | 90% | 56,637 psi | 85% | 3176 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 84% | 59,509 psi | 89% | 3117 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 59,059 psi | 89% | 3054 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% | 51,024 psi | 76% | 2904 fps | 100% |
| Accurate 8700 | <<locked>> | 92% | 41,133 psi | 62% | 2802 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 80% | 54,099 psi | 81% | 3074 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 80% | 55,709 psi | 84% | 3051 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 51,024 psi | 76% | 3009 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 80% | 38,130 psi | 57% | 2746 fps | 98.4% |
| ADI AR 2218 | 94.7 gr | 86% | 40,915 psi | 61% | 2890 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 35,476 psi | 53% | 2713 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 80% | 55,259 psi | 83% | 3038 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 51,619 psi | 77% | 3002 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 50,241 psi | 75% | 2913 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 44,556 psi | 67% | 2877 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 82% | 39,407 psi | 59% | 2805 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 88% | 42,815 psi | 64% | 2871 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 48,095 psi | 72% | 2913 fps | 98.2% |
| Bofors RP15 | <<locked>> | 80% | 48,008 psi | 72% | 2936 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 41,379 psi | 62% | 2822 fps | 99% |
| Bofors RP5 | <<locked>> | 80% | 51,619 psi | 77% | 3002 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 41,684 psi | 62% | 2825 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 80% | 53,055 psi | 80% | 2999 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 52,199 psi | 78% | 2982 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 80% | 43,947 psi | 66% | 2949 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,631 psi | 43% | 1795 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 53,330 psi | 80% | 2979 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 80% | 49,908 psi | 75% | 2995 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 84% | 48,791 psi | 73% | 2871 fps | 95.2% |
| IMR 8133 Enduron | 80.9 gr | 80% | 32,822 psi | 49% | 2621 fps | 96.2% |
| Lovex D100 | <<locked>> | 90% | 53,243 psi | 80% | 2976 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 43,888 psi | 66% | 2776 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,373 psi | 50% | 2651 fps | 98.5% |
| Norma MRP | <<locked>> | 80% | 55,463 psi | 83% | 3074 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 50,981 psi | 76% | 3015 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 55,187 psi | 83% | 3120 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 80% | 45,861 psi | 69% | 2874 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,399 psi | 44% | 1837 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 43,787 psi | 66% | 2923 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,943 psi | 60% | 2808 fps | 97.5% |
| Rottweil R 904 | <<locked>> | 80% | 55,666 psi | 83% | 3018 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 55,158 psi | 83% | 3031 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 53,243 psi | 80% | 2976 fps | 95.3% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 43,207 psi | 65% | 2828 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 54,810 psi | 82% | 3031 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 55,245 psi | 83% | 2995 fps | 100% |
| Vihtavuori 20N29 | <<locked>> | 98% | 46,891 psi | 70% | 2917 fps | 95.2% |
| Vihtavuori N165 | <<locked>> | 80% | 48,646 psi | 73% | 2874 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 44,889 psi | 67% | 2835 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 80% | 55,129 psi | 83% | 2992 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 54,737 psi | 82% | 3084 fps | 100% |
| Vihtavuori N565 | <<locked>> | 80% | 45,818 psi | 69% | 2897 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 80% | 40,988 psi | 61% | 2831 fps | 97.4% |
| Vihtavuori N570 | 88.5 gr | 82% | 42,192 psi | 63% | 2890 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 51,111 psi | 77% | 2995 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 51,430 psi | 77% | 2936 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 53 powders for 7.21 Firebird loaded with the .284 | 160gr | Reichenberg Mag Drückjagd. ADI AR 2218 delivers the highest muzzle velocity at 3,278 fps; across all powders the maximum-charge window runs from 2,001 fps to 3,278 fps. Accurate 8700 gives the best case fill at 100 %, and 53 of the 53 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 160.0 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, Vihtavuori N570, IMR 8133 Enduron rank at the top here: for 7.21 Firebird with the .284 | 160gr | Reichenberg Mag Drückjagd 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.