Load Specifications
Load data in caliber 7.21 Firebird with .284 | 162gr | RWS ID Classic 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 Alliant Reloder-50.
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% | 57,450 psi | 86% | 2982 fps | 100% |
| Accurate 3100 | <<locked>> | 82% | 56,942 psi | 85% | 2972 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 59,248 psi | 89% | 3117 fps | 99.5% |
| Accurate 8700ᴾ | <<locked>> | 100% | 58,363 psi | 87% | 3100 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 82% | 57,363 psi | 86% | 3097 fps | 100% |
| ADI AR 2213 | <<locked>> | 82% | 56,652 psi | 85% | 3084 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 57,624 psi | 86% | 3087 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,971 psi | 85% | 3077 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 58,871 psi | 88% | 3235 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 94% | 58,088 psi | 87% | 3222 fps | 99.8% |
| ADI AR 2225 | <<locked>> | 92% | 57,943 psi | 87% | 3107 fps | 100% |
| ADI AR 2225 | <<locked>> | 92% | 57,261 psi | 86% | 3097 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,957 psi | 87% | 3087 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,276 psi | 86% | 3074 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 60,089 psi | 90% | 3035 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 59,567 psi | 89% | 3025 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 57,638 psi | 86% | 3068 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 57,101 psi | 86% | 3061 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 56,782 psi | 85% | 3136 fps | 99.5% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,999 psi | 84% | 3120 fps | 99.4% |
| Alliant Reloder-50 | <<locked>> | 94% | 57,421 psi | 86% | 3136 fps | 99.3% |
| Alliant Reloder-50 | <<locked>> | 94% | 56,652 psi | 85% | 3123 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 57,029 psi | 85% | 3054 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 60,307 psi | 90% | 3104 fps | 99.8% |
| Bofors RP15 | <<locked>> | 84% | 57,537 psi | 86% | 3081 fps | 100% |
| Bofors RP15 | <<locked>> | 84% | 56,869 psi | 85% | 3068 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 57,624 psi | 86% | 3100 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,956 psi | 85% | 3091 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,957 psi | 87% | 3087 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,276 psi | 86% | 3074 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 58,842 psi | 88% | 3100 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 58,160 psi | 87% | 3091 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 59,292 psi | 89% | 3081 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 58,827 psi | 88% | 3071 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 58,349 psi | 87% | 3064 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,725 psi | 87% | 3054 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 57,972 psi | 87% | 3173 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 57,159 psi | 86% | 3159 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,174 psi | 57% | 1998 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,218 psi | 57% | 1995 fps | 100% |
| Hodgdon US 869 | <<locked>> | 98% | 59,451 psi | 89% | 3117 fps | 96.6% |
| Hodgdon US 869 | <<locked>> | 98% | 58,653 psi | 88% | 3100 fps | 96.3% |
| IMR 4955 Enduron | <<locked>> | 82% | 59,001 psi | 88% | 3051 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 58,392 psi | 88% | 3041 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 60,089 psi | 90% | 3143 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 59,364 psi | 89% | 3130 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,783 psi | 87% | 3015 fps | 97.5% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,261 psi | 86% | 3002 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 94% | 56,942 psi | 85% | 3104 fps | 100% |
| IMR 8133 Enduron | <<locked>> | 96% | 60,118 psi | 90% | 3150 fps | 100% |
| Lovex D100 | <<locked>> | 92% | 60,162 psi | 90% | 3077 fps | 97.1% |
| Lovex D100 | <<locked>> | 92% | 59,321 psi | 89% | 3061 fps | 96.9% |
| Lovex S071 | <<locked>> | 88% | 59,828 psi | 90% | 3015 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 59,350 psi | 89% | 3005 fps | 100% |
| Norma 217 | <<locked>> | 94% | 58,668 psi | 88% | 3123 fps | 100% |
| Norma 217 | <<locked>> | 94% | 58,001 psi | 87% | 3110 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 57,769 psi | 87% | 3107 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 57,058 psi | 86% | 3094 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 58,102 psi | 87% | 3156 fps | 96.4% |
| Ramshot LRT | <<locked>> | 94% | 57,406 psi | 86% | 3140 fps | 96.2% |
| Ramshot Magnum | <<locked>> | 84% | 56,289 psi | 84% | 3028 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 59,886 psi | 90% | 3077 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,305 psi | 59% | 2044 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,334 psi | 59% | 2041 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 58,929 psi | 88% | 3153 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 58,015 psi | 87% | 3140 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 57,725 psi | 87% | 3130 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 57,101 psi | 86% | 3120 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 60,162 psi | 90% | 3077 fps | 97.1% |
| Shooters World 50 BMG | <<locked>> | 92% | 59,321 psi | 89% | 3061 fps | 96.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 56,347 psi | 84% | 3054 fps | 98.9% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 59,625 psi | 89% | 3107 fps | 99.3% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 53,882 psi | 81% | 3031 fps | 97.3% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 53,069 psi | 80% | 3015 fps | 97% |
| Vihtavuori 24N41 | <<locked>> | 96% | 60,075 psi | 90% | 3130 fps | 96.6% |
| Vihtavuori 24N41 | <<locked>> | 96% | 59,393 psi | 89% | 3114 fps | 96.4% |
| Vihtavuori N165 | <<locked>> | 84% | 58,044 psi | 87% | 3005 fps | 100% |
| Vihtavuori N165 | <<locked>> | 84% | 57,595 psi | 86% | 2999 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 57,783 psi | 87% | 3054 fps | 98.7% |
| Vihtavuori N170 | <<locked>> | 88% | 57,276 psi | 86% | 3045 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 86% | 59,379 psi | 89% | 3114 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 58,726 psi | 88% | 3100 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 57,856 psi | 87% | 3133 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 57,232 psi | 86% | 3123 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 90% | 59,814 psi | 90% | 3209 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 90% | 59,132 psi | 89% | 3199 fps | 99.5% |
| Winchester StaBALL HD | <<locked>> | 82% | 58,392 psi | 88% | 3081 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 82% | 57,841 psi | 87% | 3071 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 57,624 psi | 86% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,985 psi | 85% | 3005 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% | 53,722 psi | 81% | 2927 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 53,243 psi | 80% | 2917 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 40,857 psi | 61% | 2779 fps | 95.6% |
| Accurate 8700 | <<locked>> | 90% | 40,379 psi | 61% | 2769 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 80% | 53,374 psi | 80% | 3031 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 52,852 psi | 79% | 3022 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 40,408 psi | 61% | 2779 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 80% | 39,929 psi | 60% | 2766 fps | 98.9% |
| ADI AR 2218 | 93 gr | 84% | 40,437 psi | 61% | 2861 fps | 96.1% |
| ADI AR 2218 | 93 gr | 84% | 39,914 psi | 60% | 2848 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 37,869 psi | 57% | 2753 fps | 100% |
| ADI AR 2225 | <<locked>> | 80% | 37,391 psi | 56% | 2743 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 54,070 psi | 81% | 3028 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,563 psi | 80% | 3015 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,779 psi | 79% | 2930 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,228 psi | 78% | 2923 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 47,050 psi | 71% | 2900 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,528 psi | 70% | 2890 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 39,001 psi | 58% | 2779 fps | 95.3% |
| Alliant Reloder-33 | <<locked>> | 80% | 38,551 psi | 58% | 2769 fps | 95.1% |
| Alliant Reloder-50 | 96.6 gr | 86% | 42,815 psi | 64% | 2854 fps | 96.1% |
| Alliant Reloder-50 | 96.6 gr | 86% | 42,134 psi | 63% | 2841 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 50,082 psi | 75% | 2933 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,545 psi | 74% | 2920 fps | 98.6% |
| Bofors RP15 | <<locked>> | 80% | 50,415 psi | 76% | 2966 fps | 100% |
| Bofors RP15 | <<locked>> | 80% | 49,908 psi | 75% | 2953 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,918 psi | 66% | 2858 fps | 99.6% |
| Bofors RP30 | <<locked>> | 80% | 43,439 psi | 65% | 2844 fps | 99.5% |
| Bofors RP5 | <<locked>> | 80% | 54,070 psi | 81% | 3028 fps | 100% |
| Bofors RP5 | <<locked>> | 80% | 53,563 psi | 80% | 3015 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 44,063 psi | 66% | 2851 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 43,584 psi | 65% | 2841 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 55,463 psi | 83% | 3022 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 54,998 psi | 82% | 3009 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 80% | 54,418 psi | 82% | 3002 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,969 psi | 81% | 2992 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,702 psi | 70% | 2986 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,093 psi | 69% | 2972 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,805 psi | 43% | 1791 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,747 psi | 43% | 1788 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 55,463 psi | 83% | 3048 fps | 95.6% |
| Hodgdon US 869 | <<locked>> | 96% | 54,694 psi | 82% | 3031 fps | 95.3% |
| IMR 4955 Enduron | <<locked>> | 80% | 55,361 psi | 83% | 2995 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 54,911 psi | 82% | 2986 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 52,330 psi | 78% | 3018 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 51,822 psi | 78% | 3009 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 47,630 psi | 71% | 2835 fps | 95.2% |
| IMR 7977 Enduron | <<locked>> | 84% | 50,328 psi | 75% | 2881 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 80% | 35,273 psi | 53% | 2671 fps | 97.5% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,809 psi | 52% | 2657 fps | 97.3% |
| Lovex D100 | <<locked>> | 88% | 52,040 psi | 78% | 2943 fps | 95.3% |
| Lovex D100 | <<locked>> | 88% | 51,576 psi | 77% | 2930 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 46,499 psi | 70% | 2805 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 46,006 psi | 69% | 2795 fps | 100% |
| Norma 217 | <<locked>> | 80% | 36,013 psi | 54% | 2700 fps | 99.3% |
| Norma 217 | <<locked>> | 80% | 35,520 psi | 53% | 2687 fps | 99.2% |
| Ramshot Grand | <<locked>> | 80% | 53,621 psi | 80% | 3041 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 53,069 psi | 80% | 3031 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 54,128 psi | 81% | 3087 fps | 95.5% |
| Ramshot LRT | <<locked>> | 92% | 53,432 psi | 80% | 3071 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 80% | 48,573 psi | 73% | 2907 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 47,964 psi | 72% | 2894 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,588 psi | 44% | 1834 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,544 psi | 44% | 1827 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 46,731 psi | 70% | 2956 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 46,021 psi | 69% | 2946 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,743 psi | 64% | 2858 fps | 98.5% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,308 psi | 63% | 2844 fps | 98.3% |
| Shooters World 50 BMG | <<locked>> | 88% | 52,040 psi | 78% | 2943 fps | 95.3% |
| Shooters World 50 BMG | <<locked>> | 88% | 51,576 psi | 77% | 2930 fps | 95.1% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 42,931 psi | 64% | 2805 fps | 95.9% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 42,293 psi | 63% | 2789 fps | 95.6% |
| Vihtavuori 20N29 | <<locked>> | 96% | 46,644 psi | 70% | 2897 fps | 95.4% |
| Vihtavuori 20N29 | <<locked>> | 96% | 46,006 psi | 69% | 2881 fps | 95% |
| Vihtavuori 24N41 | <<locked>> | 94% | 55,970 psi | 84% | 3061 fps | 95.7% |
| Vihtavuori 24N41 | <<locked>> | 94% | 55,259 psi | 83% | 3048 fps | 95.4% |
| Vihtavuori N165 | <<locked>> | 80% | 50,894 psi | 76% | 2897 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 50,444 psi | 76% | 2887 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 44,179 psi | 66% | 2802 fps | 95.7% |
| Vihtavuori N170 | <<locked>> | 80% | 43,642 psi | 65% | 2789 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 80% | 48,399 psi | 73% | 2927 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 80% | 47,921 psi | 72% | 2917 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 80% | 43,511 psi | 65% | 2871 fps | 98.2% |
| Vihtavuori N568 | <<locked>> | 80% | 43,033 psi | 65% | 2858 fps | 98.1% |
| Vihtavuori N570 | 86.7 gr | 80% | 41,756 psi | 63% | 2864 fps | 95.9% |
| Vihtavuori N570 | 86.7 gr | 80% | 41,118 psi | 62% | 2848 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 54,433 psi | 82% | 3025 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 53,606 psi | 80% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,708 psi | 81% | 2956 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,258 psi | 80% | 2946 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 | 162gr | RWS ID Classic. ADI AR 2218 delivers the highest muzzle velocity at 3,235 fps; across all powders the maximum-charge window runs from 1,995 fps to 3,235 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 162.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Accurate 8700, 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, Alliant Reloder-50 rank at the top here: for 7.21 Firebird with the .284 | 162gr | RWS ID Classic 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.