Load Specifications
Load data in caliber 7.21 Firebird with .284 | 180gr | Lapua ScenarL bullet and 44 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 Ramshot LRT.
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>> | 82% | 58,668 psi | 88% | 2861 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 56,246 psi | 84% | 2949 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 82% | 58,581 psi | 88% | 2976 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 58,943 psi | 88% | 2969 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 56,072 psi | 84% | 3061 fps | 99.9% |
| ADI AR 2225 | <<locked>> | 92% | 59,495 psi | 89% | 2992 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 59,161 psi | 89% | 2969 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 57,537 psi | 86% | 2861 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 58,987 psi | 88% | 2949 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 58,131 psi | 87% | 3031 fps | 99.9% |
| Alliant Reloder-50 | <<locked>> | 94% | 58,871 psi | 88% | 3035 fps | 99.8% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 58,189 psi | 87% | 2940 fps | 99.9% |
| Bofors RP15 | <<locked>> | 84% | 58,755 psi | 88% | 2959 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 58,987 psi | 88% | 2986 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 59,161 psi | 89% | 2969 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 56,101 psi | 84% | 2927 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 59,466 psi | 89% | 2946 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 59,654 psi | 89% | 3058 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,305 psi | 57% | 1890 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 56,550 psi | 85% | 2949 fps | 96.8% |
| IMR 4955 Enduron | <<locked>> | 82% | 60,075 psi | 90% | 2930 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 57,508 psi | 86% | 2966 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 58,813 psi | 88% | 2904 fps | 98.3% |
| IMR 8133 Enduron | <<locked>> | 94% | 58,175 psi | 87% | 2989 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 57,058 psi | 86% | 2907 fps | 97.3% |
| Lovex S071 | <<locked>> | 86% | 57,334 psi | 86% | 2841 fps | 100% |
| Norma 217 | <<locked>> | 94% | 60,292 psi | 90% | 3009 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 59,393 psi | 89% | 2989 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 59,480 psi | 89% | 3054 fps | 97.5% |
| Ramshot Magnum | <<locked>> | 84% | 57,537 psi | 86% | 2910 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,508 psi | 59% | 1936 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 56,115 psi | 84% | 2976 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 59,132 psi | 89% | 3022 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 57,058 psi | 86% | 2907 fps | 97.3% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 57,682 psi | 86% | 2953 fps | 99.5% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 55,056 psi | 83% | 2933 fps | 98.2% |
| Vihtavuori 24N41 | <<locked>> | 94% | 57,159 psi | 86% | 2959 fps | 96.8% |
| Vihtavuori N165 | <<locked>> | 84% | 59,277 psi | 89% | 2887 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 58,987 psi | 88% | 2946 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 84% | 56,739 psi | 85% | 2940 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 59,321 psi | 89% | 3025 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 57,116 psi | 86% | 3038 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 82% | 60,147 psi | 90% | 2963 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 58,827 psi | 88% | 2897 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% | 54,940 psi | 82% | 2808 fps | 100% |
| Accurate 8700 | <<locked>> | 88% | 39,030 psi | 59% | 2631 fps | 96% |
| ADI AR 2213 | <<locked>> | 80% | 54,694 psi | 82% | 2920 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 41,510 psi | 62% | 2684 fps | 99.7% |
| ADI AR 2218 | 85 gr | 80% | 35,752 psi | 54% | 2635 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 38,928 psi | 58% | 2657 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 55,376 psi | 83% | 2910 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 54,056 psi | 81% | 2812 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 48,269 psi | 72% | 2792 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 40,205 psi | 60% | 2697 fps | 96.8% |
| Alliant Reloder-50 | <<locked>> | 82% | 37,971 psi | 57% | 2635 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 51,140 psi | 77% | 2825 fps | 99.3% |
| Bofors RP15 | <<locked>> | 80% | 51,517 psi | 77% | 2851 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 45,107 psi | 68% | 2759 fps | 99.9% |
| Bofors RP5 | <<locked>> | 80% | 55,376 psi | 83% | 2910 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 45,368 psi | 68% | 2753 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 80% | 55,666 psi | 83% | 2890 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 48,022 psi | 72% | 2877 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,863 psi | 43% | 1690 fps | 100% |
| Hodgdon US 869 | <<locked>> | 94% | 52,765 psi | 79% | 2884 fps | 95.9% |
| IMR 4955 Enduron | <<locked>> | 80% | 56,391 psi | 85% | 2877 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 53,693 psi | 80% | 2907 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 80% | 45,426 psi | 68% | 2671 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 80% | 36,376 psi | 55% | 2589 fps | 98.6% |
| Lovex D100 | <<locked>> | 86% | 49,545 psi | 74% | 2779 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 47,572 psi | 71% | 2697 fps | 100% |
| Norma 217 | <<locked>> | 80% | 37,260 psi | 56% | 2615 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 55,129 psi | 83% | 2927 fps | 100% |
| Ramshot LRT | 95.5 gr | 90% | 51,648 psi | 77% | 2920 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 80% | 49,719 psi | 75% | 2795 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,718 psi | 45% | 1732 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 48,167 psi | 72% | 2854 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 44,034 psi | 66% | 2766 fps | 99.3% |
| Shooters World 50 BMG | <<locked>> | 86% | 49,545 psi | 74% | 2779 fps | 95.5% |
| SNPE Vectan SP 13 | <<locked>> | 86% | 38,377 psi | 58% | 2595 fps | 95.3% |
| Vihtavuori 20N29 | <<locked>> | 94% | 44,556 psi | 67% | 2743 fps | 95.7% |
| Vihtavuori 24N41 | <<locked>> | 92% | 53,229 psi | 80% | 2894 fps | 95.9% |
| Vihtavuori N165 | <<locked>> | 80% | 52,025 psi | 78% | 2782 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 45,150 psi | 68% | 2707 fps | 96.9% |
| Vihtavuori N565 | <<locked>> | 80% | 49,632 psi | 74% | 2825 fps | 100% |
| Vihtavuori N568 | <<locked>> | 80% | 44,701 psi | 67% | 2772 fps | 99.1% |
| Vihtavuori N570 | 83.3 gr | 80% | 42,946 psi | 64% | 2772 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 55,869 psi | 84% | 2907 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 54,853 psi | 82% | 2841 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 44 powders for 7.21 Firebird loaded with the .284 | 180gr | Lapua ScenarL. ADI AR 2218 delivers the highest muzzle velocity at 3,061 fps; across all powders the maximum-charge window runs from 1,890 fps to 3,061 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 44 of the 44 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 180.0 gr projectile in 0.284" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori 20N29 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, Ramshot LRT rank at the top here: for 7.21 Firebird with the .284 | 180gr | Lapua ScenarL 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.