Load Specifications
Load data in caliber 7.21 Firebird with .284 | 173gr | RWS H-Mantel bullet and 90 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 Hodgdon H1000.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 82% | 58,436 psi | 88% | 2910 fps | 100% |
| Accurate 3100 | <<locked>> | 82% | 58,566 psi | 88% | 2910 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 60,292 psi | 90% | 3054 fps | 99.8% |
| Accurate 8700 | <<locked>> | 98% | 56,231 psi | 84% | 2995 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 82% | 58,233 psi | 87% | 3025 fps | 100% |
| ADI AR 2213 | <<locked>> | 82% | 58,392 psi | 88% | 3025 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 58,755 psi | 88% | 3018 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 58,682 psi | 88% | 3018 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 60,162 psi | 90% | 3176 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 60,307 psi | 90% | 3176 fps | 100% |
| ADI AR 2225 | <<locked>> | 92% | 59,132 psi | 89% | 3038 fps | 100% |
| ADI AR 2225 | <<locked>> | 92% | 59,263 psi | 89% | 3041 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 58,842 psi | 88% | 3015 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 58,958 psi | 88% | 3015 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 57,334 psi | 86% | 2910 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 57,290 psi | 86% | 2910 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 58,740 psi | 88% | 2995 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 58,856 psi | 88% | 2999 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 57,986 psi | 87% | 3077 fps | 99.8% |
| Alliant Reloder-33 | <<locked>> | 90% | 57,943 psi | 87% | 3077 fps | 99.8% |
| Alliant Reloder-50 | <<locked>> | 94% | 58,711 psi | 88% | 3077 fps | 99.7% |
| Alliant Reloder-50 | <<locked>> | 94% | 58,653 psi | 88% | 3077 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 57,899 psi | 87% | 2986 fps | 99.8% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 58,015 psi | 87% | 2989 fps | 99.8% |
| Bofors RP15 | <<locked>> | 84% | 58,436 psi | 88% | 3009 fps | 100% |
| Bofors RP15 | <<locked>> | 84% | 58,552 psi | 88% | 3012 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 58,682 psi | 88% | 3031 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 58,798 psi | 88% | 3035 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 58,842 psi | 88% | 3015 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 58,958 psi | 88% | 3015 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 59,973 psi | 90% | 3031 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 60,104 psi | 90% | 3031 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 60,336 psi | 90% | 3009 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 60,292 psi | 90% | 3009 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 59,190 psi | 89% | 2992 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 59,321 psi | 89% | 2995 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 59,306 psi | 89% | 3104 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 59,234 psi | 89% | 3104 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,305 psi | 57% | 1932 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,276 psi | 57% | 1932 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 56,420 psi | 85% | 2992 fps | 96.4% |
| Hodgdon US 869 | <<locked>> | 96% | 56,565 psi | 85% | 2992 fps | 96.5% |
| IMR 4955 Enduron | <<locked>> | 82% | 59,857 psi | 90% | 2979 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 59,814 psi | 90% | 2979 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 57,188 psi | 86% | 3012 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 57,130 psi | 86% | 3012 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 58,726 psi | 88% | 2953 fps | 98.1% |
| IMR 7977 Enduron | <<locked>> | 88% | 58,668 psi | 88% | 2949 fps | 98.1% |
| IMR 8133 Enduron | <<locked>> | 94% | 58,030 psi | 87% | 3035 fps | 100% |
| IMR 8133 Enduron | <<locked>> | 94% | 58,001 psi | 87% | 3035 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 56,942 psi | 85% | 2949 fps | 97% |
| Lovex D100 | <<locked>> | 90% | 56,884 psi | 85% | 2949 fps | 97% |
| Lovex S071 | <<locked>> | 86% | 57,101 psi | 86% | 2890 fps | 100% |
| Lovex S071 | <<locked>> | 86% | 57,246 psi | 86% | 2894 fps | 100% |
| Norma 217 | <<locked>> | 94% | 59,886 psi | 90% | 3051 fps | 100% |
| Norma 217 | <<locked>> | 94% | 60,060 psi | 90% | 3054 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 58,943 psi | 88% | 3035 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 59,088 psi | 89% | 3038 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 59,219 psi | 89% | 3097 fps | 97.2% |
| Ramshot LRT | <<locked>> | 94% | 59,379 psi | 89% | 3100 fps | 97.2% |
| Ramshot Magnum | <<locked>> | 84% | 57,348 psi | 86% | 2959 fps | 100% |
| Ramshot Magnum | <<locked>> | 84% | 57,508 psi | 86% | 2959 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,465 psi | 59% | 1978 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,450 psi | 59% | 1978 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 60,205 psi | 90% | 3084 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 60,147 psi | 90% | 3084 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 59,059 psi | 89% | 3071 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 59,001 psi | 88% | 3068 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 56,942 psi | 85% | 2949 fps | 97% |
| Shooters World 50 BMG | <<locked>> | 90% | 56,884 psi | 85% | 2949 fps | 97% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 57,435 psi | 86% | 2995 fps | 99.4% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 57,580 psi | 86% | 2995 fps | 99.4% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 54,824 psi | 82% | 2972 fps | 98% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 54,969 psi | 82% | 2976 fps | 98% |
| Vihtavuori 24N41 | <<locked>> | 94% | 56,942 psi | 85% | 3002 fps | 96.5% |
| Vihtavuori 24N41 | <<locked>> | 94% | 56,869 psi | 85% | 3002 fps | 96.5% |
| Vihtavuori N165 | <<locked>> | 84% | 59,103 psi | 89% | 2936 fps | 100% |
| Vihtavuori N165 | <<locked>> | 84% | 59,074 psi | 89% | 2936 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 58,885 psi | 88% | 2992 fps | 99.2% |
| Vihtavuori N170 | <<locked>> | 88% | 58,856 psi | 88% | 2992 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 84% | 56,478 psi | 85% | 2986 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 60,336 psi | 90% | 3041 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 58,958 psi | 88% | 3068 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 59,117 psi | 89% | 3071 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 56,971 psi | 85% | 3084 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 88% | 56,898 psi | 85% | 3084 fps | 99.5% |
| Winchester StaBALL HD | <<locked>> | 82% | 59,683 psi | 89% | 3009 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 82% | 59,843 psi | 90% | 3012 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 58,479 psi | 88% | 2943 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 58,595 psi | 88% | 2946 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% | 54,766 psi | 82% | 2858 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 54,708 psi | 82% | 2858 fps | 100% |
| Accurate 8700 | <<locked>> | 88% | 38,914 psi | 58% | 2667 fps | 95.5% |
| Accurate 8700 | <<locked>> | 88% | 38,899 psi | 58% | 2667 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 80% | 54,476 psi | 82% | 2966 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 54,447 psi | 82% | 2966 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 41,336 psi | 62% | 2723 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 80% | 41,292 psi | 62% | 2723 fps | 99.5% |
| ADI AR 2218 | 89.2 gr | 82% | 38,363 psi | 57% | 2740 fps | 95.9% |
| ADI AR 2218 | 89.2 gr | 82% | 38,305 psi | 57% | 2740 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 38,725 psi | 58% | 2697 fps | 100% |
| ADI AR 2225 | <<locked>> | 80% | 38,827 psi | 58% | 2700 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 55,158 psi | 83% | 2959 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 55,129 psi | 83% | 2959 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 53,737 psi | 81% | 2858 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 53,679 psi | 80% | 2858 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 47,950 psi | 72% | 2835 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 48,051 psi | 72% | 2835 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 39,958 psi | 60% | 2733 fps | 96.4% |
| Alliant Reloder-33 | <<locked>> | 80% | 39,929 psi | 60% | 2733 fps | 96.4% |
| Alliant Reloder-50 | <<locked>> | 84% | 40,727 psi | 61% | 2740 fps | 96.1% |
| Alliant Reloder-50 | <<locked>> | 84% | 40,698 psi | 61% | 2740 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 50,821 psi | 76% | 2867 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 50,952 psi | 76% | 2871 fps | 99.2% |
| Bofors RP15 | <<locked>> | 80% | 51,358 psi | 77% | 2897 fps | 100% |
| Bofors RP15 | <<locked>> | 80% | 51,314 psi | 77% | 2897 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 44,904 psi | 67% | 2799 fps | 99.8% |
| Bofors RP30 | <<locked>> | 80% | 44,875 psi | 67% | 2799 fps | 99.8% |
| Bofors RP5 | <<locked>> | 80% | 55,158 psi | 83% | 2959 fps | 100% |
| Bofors RP5 | <<locked>> | 80% | 55,129 psi | 83% | 2959 fps | 100% |
| Hodgdon H1000 | 82.5 gr | 80% | 45,150 psi | 68% | 2795 fps | 100% |
| Hodgdon H1000 | 82.5 gr | 80% | 45,107 psi | 68% | 2795 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 56,362 psi | 84% | 2949 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 56,318 psi | 84% | 2949 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 80% | 55,477 psi | 83% | 2936 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 80% | 55,434 psi | 83% | 2936 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 47,761 psi | 72% | 2920 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 47,877 psi | 72% | 2923 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,805 psi | 43% | 1729 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,790 psi | 43% | 1729 fps | 100% |
| Hodgdon US 869 | <<locked>> | 94% | 52,533 psi | 79% | 2923 fps | 95.5% |
| Hodgdon US 869 | <<locked>> | 94% | 52,663 psi | 79% | 2927 fps | 95.5% |
| IMR 4955 Enduron | <<locked>> | 80% | 56,086 psi | 84% | 2923 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 56,202 psi | 84% | 2923 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 53,287 psi | 80% | 2949 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 53,417 psi | 80% | 2953 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 80% | 45,339 psi | 68% | 2713 fps | 95.1% |
| IMR 7977 Enduron | <<locked>> | 80% | 45,295 psi | 68% | 2713 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 80% | 36,114 psi | 54% | 2621 fps | 98.3% |
| IMR 8133 Enduron | <<locked>> | 80% | 36,100 psi | 54% | 2621 fps | 98.3% |
| Lovex D100 | <<locked>> | 86% | 49,414 psi | 74% | 2822 fps | 95.2% |
| Lovex D100 | <<locked>> | 86% | 49,371 psi | 74% | 2822 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 47,239 psi | 71% | 2736 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 47,355 psi | 71% | 2743 fps | 100% |
| Norma 217 | <<locked>> | 80% | 36,970 psi | 55% | 2651 fps | 99.7% |
| Norma 217 | <<locked>> | 80% | 37,072 psi | 56% | 2654 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 54,810 psi | 82% | 2976 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 54,940 psi | 82% | 2979 fps | 100% |
| Ramshot LRT | <<locked>> | 90% | 51,387 psi | 77% | 2963 fps | 95.3% |
| Ramshot LRT | <<locked>> | 90% | 51,343 psi | 77% | 2959 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 80% | 49,545 psi | 74% | 2841 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 49,487 psi | 74% | 2838 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,762 psi | 45% | 1772 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,747 psi | 45% | 1772 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 47,877 psi | 72% | 2897 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 47,819 psi | 72% | 2894 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 43,787 psi | 66% | 2802 fps | 99.1% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 43,729 psi | 66% | 2802 fps | 99.1% |
| Shooters World 50 BMG | <<locked>> | 86% | 49,414 psi | 74% | 2822 fps | 95.2% |
| Shooters World 50 BMG | <<locked>> | 86% | 49,371 psi | 74% | 2822 fps | 95.2% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 40,872 psi | 61% | 2690 fps | 95.8% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 40,828 psi | 61% | 2687 fps | 95.8% |
| Vihtavuori 20N29 | <<locked>> | 94% | 44,266 psi | 66% | 2779 fps | 95.2% |
| Vihtavuori 20N29 | <<locked>> | 94% | 44,396 psi | 67% | 2779 fps | 95.2% |
| Vihtavuori 24N41 | <<locked>> | 92% | 52,953 psi | 79% | 2933 fps | 95.5% |
| Vihtavuori 24N41 | <<locked>> | 92% | 53,069 psi | 80% | 2936 fps | 95.5% |
| Vihtavuori N165 | <<locked>> | 80% | 51,851 psi | 78% | 2828 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 51,808 psi | 78% | 2828 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 44,889 psi | 67% | 2746 fps | 96.5% |
| Vihtavuori N170 | <<locked>> | 80% | 45,005 psi | 67% | 2746 fps | 96.5% |
| Vihtavuori N565 | <<locked>> | 80% | 49,356 psi | 74% | 2867 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 80% | 49,298 psi | 74% | 2867 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 80% | 44,527 psi | 67% | 2815 fps | 98.9% |
| Vihtavuori N568 | <<locked>> | 80% | 44,498 psi | 67% | 2815 fps | 98.9% |
| Vihtavuori N570 | 85.3 gr | 80% | 42,612 psi | 64% | 2808 fps | 96.8% |
| Vihtavuori N570 | 85.3 gr | 80% | 42,757 psi | 64% | 2812 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 55,492 psi | 83% | 2953 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 55,666 psi | 83% | 2956 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 54,607 psi | 82% | 2887 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 54,737 psi | 82% | 2890 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 90 powders for 7.21 Firebird loaded with the .284 | 173gr | RWS H-Mantel. ADI AR 2218 delivers the highest muzzle velocity at 3,176 fps; across all powders the maximum-charge window runs from 1,932 fps to 3,176 fps. Accurate 8700 gives the best case fill at 100 %, and 90 of the 90 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 173.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, 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. ADI AR 2218, Vihtavuori N570, Hodgdon H1000 rank at the top here: for 7.21 Firebird with the .284 | 173gr | RWS H-Mantel 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.