Load Specifications
Bullet:.284 | 185gr | Nosler RDF
Bullet Manufacturer:Nosler
Bullet Weight:185 gr
Bullet Diameter:0.284"
Bullet Length:<<locked>>
Caliber:7.21 Firebird load data
Case Length (l3):2.8"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:121 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:26"
Max. allowed Pressure:66,717 psi
Recommended Twist Rate:1:9.0
Load data in caliber 7.21 Firebird with .284 | 185gr | Nosler RDF bullet and 116 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.
A valid access license is required to use the Personalized Load Calculator.
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% | 59,901 psi | 90% | 2841 fps | 100% |
| Accurate 3100 | <<locked>> | 82% | 59,683 psi | 89% | 2838 fps | 100% |
| Accurate 3100 | <<locked>> | 82% | 59,901 psi | 90% | 2841 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 57,769 psi | 87% | 2940 fps | 99.8% |
| Accurate 8700 | <<locked>> | 98% | 57,435 psi | 86% | 2936 fps | 99.8% |
| Accurate 8700 | <<locked>> | 98% | 57,769 psi | 87% | 2940 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 82% | 59,872 psi | 90% | 2959 fps | 100% |
| ADI AR 2213 | <<locked>> | 82% | 59,654 psi | 89% | 2956 fps | 100% |
| ADI AR 2213 | <<locked>> | 82% | 59,872 psi | 90% | 2959 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 60,365 psi | 90% | 2956 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 60,162 psi | 90% | 2953 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 60,365 psi | 90% | 2956 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 57,479 psi | 86% | 3051 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 57,290 psi | 86% | 3048 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 57,479 psi | 86% | 3051 fps | 100% |
| ADI AR 2225 | <<locked>> | 90% | 56,826 psi | 85% | 2920 fps | 100% |
| ADI AR 2225 | <<locked>> | 90% | 56,637 psi | 85% | 2920 fps | 100% |
| ADI AR 2225 | <<locked>> | 90% | 56,826 psi | 85% | 2920 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 60,191 psi | 90% | 2946 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 58,769 psi | 88% | 2841 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 58,537 psi | 88% | 2838 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 58,769 psi | 88% | 2841 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 84% | 56,463 psi | 85% | 2877 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 60,162 psi | 90% | 2927 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 84% | 56,463 psi | 85% | 2877 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 59,683 psi | 89% | 3022 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 59,306 psi | 89% | 3015 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 59,683 psi | 89% | 3022 fps | 100% |
| Alliant Reloder-50 | <<locked>> | 92% | 56,173 psi | 84% | 2963 fps | 99.7% |
| Alliant Reloder-50 | <<locked>> | 94% | 60,118 psi | 90% | 3022 fps | 99.9% |
| Alliant Reloder-50 | <<locked>> | 92% | 56,173 psi | 84% | 2963 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 59,146 psi | 89% | 2923 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 58,972 psi | 88% | 2920 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 59,146 psi | 89% | 2923 fps | 100% |
| Bofors RP15 | <<locked>> | 84% | 59,785 psi | 90% | 2940 fps | 100% |
| Bofors RP15 | <<locked>> | 84% | 59,582 psi | 89% | 2940 fps | 100% |
| Bofors RP15 | <<locked>> | 84% | 59,785 psi | 90% | 2940 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 60,365 psi | 90% | 2969 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 59,959 psi | 90% | 2966 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 60,365 psi | 90% | 2969 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 60,191 psi | 90% | 2946 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 57,464 psi | 86% | 2910 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 57,261 psi | 86% | 2907 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 57,464 psi | 86% | 2910 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 56,898 psi | 85% | 2979 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 56,652 psi | 85% | 2976 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 56,898 psi | 85% | 2979 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,334 psi | 57% | 1867 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,348 psi | 57% | 1864 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,334 psi | 57% | 1867 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 57,943 psi | 87% | 2940 fps | 97.3% |
| Hodgdon US 869 | <<locked>> | 96% | 57,624 psi | 86% | 2936 fps | 97.3% |
| Hodgdon US 869 | <<locked>> | 96% | 57,943 psi | 87% | 2940 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 82% | 58,595 psi | 88% | 2946 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 58,363 psi | 87% | 2943 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 58,595 psi | 88% | 2946 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 59,901 psi | 90% | 2890 fps | 98.7% |
| IMR 7977 Enduron | <<locked>> | 88% | 59,756 psi | 90% | 2887 fps | 98.7% |
| IMR 7977 Enduron | <<locked>> | 88% | 59,901 psi | 90% | 2890 fps | 98.7% |
| IMR 8133 Enduron | <<locked>> | 94% | 59,654 psi | 89% | 2976 fps | 100% |
| IMR 8133 Enduron | <<locked>> | 94% | 59,437 psi | 89% | 2972 fps | 100% |
| IMR 8133 Enduron | <<locked>> | 94% | 59,654 psi | 89% | 2976 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 58,305 psi | 87% | 2897 fps | 97.8% |
| Lovex D100 | <<locked>> | 90% | 57,986 psi | 87% | 2890 fps | 97.7% |
| Lovex D100 | <<locked>> | 90% | 58,305 psi | 87% | 2897 fps | 97.8% |
| Lovex S071 | <<locked>> | 86% | 58,523 psi | 88% | 2822 fps | 100% |
| Lovex S071 | <<locked>> | 86% | 58,305 psi | 87% | 2822 fps | 100% |
| Lovex S071 | <<locked>> | 86% | 58,523 psi | 88% | 2822 fps | 100% |
| Norma 217 | <<locked>> | 92% | 57,624 psi | 86% | 2936 fps | 100% |
| Norma 217 | <<locked>> | 92% | 57,377 psi | 86% | 2933 fps | 100% |
| Norma 217 | <<locked>> | 92% | 57,624 psi | 86% | 2936 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 56,666 psi | 85% | 2979 fps | 97.3% |
| Ramshot LRT | <<locked>> | 92% | 56,521 psi | 85% | 2976 fps | 97.2% |
| Ramshot LRT | <<locked>> | 92% | 56,666 psi | 85% | 2979 fps | 97.3% |
| Ramshot Magnum | <<locked>> | 84% | 58,914 psi | 88% | 2897 fps | 100% |
| Ramshot Magnum | <<locked>> | 84% | 58,711 psi | 88% | 2890 fps | 100% |
| Ramshot Magnum | <<locked>> | 84% | 58,914 psi | 88% | 2897 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,537 psi | 59% | 1909 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,566 psi | 59% | 1909 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,537 psi | 59% | 1909 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 57,450 psi | 86% | 2959 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 57,246 psi | 86% | 2956 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 57,450 psi | 86% | 2959 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 56,304 psi | 84% | 2946 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 56,130 psi | 84% | 2943 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 56,304 psi | 84% | 2946 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 58,305 psi | 87% | 2897 fps | 97.8% |
| Shooters World 50 BMG | <<locked>> | 90% | 57,986 psi | 87% | 2890 fps | 97.7% |
| Shooters World 50 BMG | <<locked>> | 90% | 58,305 psi | 87% | 2897 fps | 97.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 59,103 psi | 89% | 2943 fps | 99.7% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 58,769 psi | 88% | 2936 fps | 99.7% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 59,103 psi | 89% | 2943 fps | 99.7% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 56,536 psi | 85% | 2927 fps | 98.7% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 56,231 psi | 84% | 2923 fps | 98.6% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 56,536 psi | 85% | 2927 fps | 98.7% |
| Vihtavuori 24N41 | <<locked>> | 94% | 58,320 psi | 87% | 2946 fps | 97.4% |
| Vihtavuori 24N41 | <<locked>> | 94% | 58,204 psi | 87% | 2946 fps | 97.3% |
| Vihtavuori 24N41 | <<locked>> | 94% | 58,320 psi | 87% | 2946 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 82% | 56,681 psi | 85% | 2818 fps | 100% |
| Vihtavuori N165 | <<locked>> | 84% | 60,263 psi | 90% | 2864 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 56,681 psi | 85% | 2818 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 60,249 psi | 90% | 2933 fps | 99.6% |
| Vihtavuori N170 | <<locked>> | 88% | 59,901 psi | 90% | 2927 fps | 99.5% |
| Vihtavuori N170 | <<locked>> | 88% | 60,249 psi | 90% | 2933 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 84% | 57,856 psi | 87% | 2923 fps | 100% |
| Vihtavuori N565 | <<locked>> | 84% | 57,638 psi | 86% | 2920 fps | 100% |
| Vihtavuori N565 | <<locked>> | 84% | 57,856 psi | 87% | 2923 fps | 100% |
| Vihtavuori N568 | <<locked>> | 86% | 56,695 psi | 85% | 2949 fps | 100% |
| Vihtavuori N568 | <<locked>> | 86% | 56,304 psi | 84% | 2946 fps | 100% |
| Vihtavuori N568 | <<locked>> | 86% | 56,695 psi | 85% | 2949 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 58,581 psi | 88% | 3025 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 88% | 58,175 psi | 87% | 3022 fps | 99.8% |
| Vihtavuori N570 | <<locked>> | 88% | 58,581 psi | 88% | 3025 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 82% | 59,814 psi | 90% | 2877 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 59,611 psi | 89% | 2874 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 59,814 psi | 90% | 2877 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% | 56,072 psi | 84% | 2792 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 55,883 psi | 84% | 2789 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 56,072 psi | 84% | 2792 fps | 100% |
| Accurate 8700 | <<locked>> | 86% | 37,318 psi | 56% | 2566 fps | 95.7% |
| Accurate 8700 | <<locked>> | 86% | 37,173 psi | 56% | 2562 fps | 95.6% |
| Accurate 8700 | <<locked>> | 86% | 37,318 psi | 56% | 2566 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 80% | 55,738 psi | 84% | 2900 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 55,521 psi | 83% | 2894 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 55,738 psi | 84% | 2900 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 42,583 psi | 64% | 2671 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 80% | 42,380 psi | 64% | 2667 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 80% | 42,583 psi | 64% | 2671 fps | 99.9% |
| ADI AR 2218 | 85.1 gr | 80% | 36,709 psi | 55% | 2631 fps | 96.1% |
| ADI AR 2218 | 85.1 gr | 80% | 36,564 psi | 55% | 2628 fps | 96% |
| ADI AR 2218 | 85.1 gr | 80% | 36,709 psi | 55% | 2631 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 40,045 psi | 60% | 2648 fps | 100% |
| ADI AR 2225 | <<locked>> | 80% | 39,871 psi | 60% | 2644 fps | 100% |
| ADI AR 2225 | <<locked>> | 80% | 40,045 psi | 60% | 2648 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 56,188 psi | 84% | 2890 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 55,027 psi | 82% | 2792 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 54,781 psi | 82% | 2789 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 55,027 psi | 82% | 2792 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 49,313 psi | 74% | 2772 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 49,081 psi | 74% | 2769 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 49,313 psi | 74% | 2772 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 41,220 psi | 62% | 2690 fps | 97.4% |
| Alliant Reloder-33 | <<locked>> | 80% | 41,046 psi | 62% | 2687 fps | 97.4% |
| Alliant Reloder-33 | <<locked>> | 80% | 41,220 psi | 62% | 2690 fps | 97.4% |
| Alliant Reloder-50 | <<locked>> | 80% | 36,318 psi | 54% | 2566 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 82% | 38,812 psi | 58% | 2628 fps | 96.1% |
| Alliant Reloder-50 | <<locked>> | 80% | 36,318 psi | 54% | 2566 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 51,982 psi | 78% | 2808 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 51,822 psi | 78% | 2808 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 51,982 psi | 78% | 2808 fps | 99.6% |
| Bofors RP15 | <<locked>> | 80% | 52,663 psi | 79% | 2835 fps | 100% |
| Bofors RP15 | <<locked>> | 80% | 52,431 psi | 79% | 2831 fps | 100% |
| Bofors RP15 | <<locked>> | 80% | 52,663 psi | 79% | 2835 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 46,209 psi | 69% | 2746 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 46,021 psi | 69% | 2743 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 46,209 psi | 69% | 2746 fps | 100% |
| Bofors RP5 | <<locked>> | 80% | 56,188 psi | 84% | 2890 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 46,383 psi | 70% | 2740 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 46,311 psi | 69% | 2736 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 46,383 psi | 70% | 2740 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 49,371 psi | 74% | 2864 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 49,124 psi | 74% | 2861 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 49,371 psi | 74% | 2864 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,892 psi | 43% | 1670 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,877 psi | 43% | 1670 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,892 psi | 43% | 1670 fps | 100% |
| Hodgdon US 869 | <<locked>> | 92% | 50,343 psi | 75% | 2815 fps | 95.6% |
| Hodgdon US 869 | <<locked>> | 92% | 50,183 psi | 75% | 2812 fps | 95.5% |
| Hodgdon US 869 | <<locked>> | 92% | 50,343 psi | 75% | 2815 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 80% | 54,752 psi | 82% | 2887 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 54,505 psi | 82% | 2887 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 54,752 psi | 82% | 2887 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 80% | 46,325 psi | 69% | 2661 fps | 96.1% |
| IMR 7977 Enduron | <<locked>> | 80% | 46,166 psi | 69% | 2657 fps | 96% |
| IMR 7977 Enduron | <<locked>> | 80% | 46,325 psi | 69% | 2661 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 80% | 37,260 psi | 56% | 2579 fps | 99.1% |
| IMR 8133 Enduron | <<locked>> | 80% | 37,072 psi | 56% | 2572 fps | 99% |
| IMR 8133 Enduron | <<locked>> | 80% | 37,260 psi | 56% | 2579 fps | 99.1% |
| Lovex D100 | <<locked>> | 84% | 47,137 psi | 71% | 2707 fps | 95.2% |
| Lovex D100 | <<locked>> | 84% | 46,992 psi | 70% | 2703 fps | 95.2% |
| Lovex D100 | <<locked>> | 84% | 47,137 psi | 71% | 2707 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 48,443 psi | 73% | 2677 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 48,414 psi | 73% | 2677 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 48,443 psi | 73% | 2677 fps | 100% |
| Norma 217 | <<locked>> | 80% | 38,203 psi | 57% | 2602 fps | 100% |
| Norma 217 | <<locked>> | 80% | 38,130 psi | 57% | 2602 fps | 100% |
| Norma 217 | <<locked>> | 80% | 38,203 psi | 57% | 2602 fps | 100% |
| Ramshot LRT | 93.4 gr | 88% | 49,211 psi | 74% | 2844 fps | 95.4% |
| Ramshot LRT | 93.4 gr | 88% | 49,052 psi | 74% | 2844 fps | 95.4% |
| Ramshot LRT | 93.4 gr | 88% | 49,211 psi | 74% | 2844 fps | 95.4% |
| Ramshot Magnum | <<locked>> | 80% | 50,981 psi | 76% | 2782 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 50,778 psi | 76% | 2779 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 50,981 psi | 76% | 2782 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,747 psi | 45% | 1709 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,733 psi | 45% | 1709 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,747 psi | 45% | 1709 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 49,400 psi | 74% | 2841 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 49,139 psi | 74% | 2838 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 49,400 psi | 74% | 2841 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 45,107 psi | 68% | 2753 fps | 99.6% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 44,918 psi | 67% | 2753 fps | 99.6% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 45,107 psi | 68% | 2753 fps | 99.6% |
| Shooters World 50 BMG | <<locked>> | 84% | 47,137 psi | 71% | 2707 fps | 95.2% |
| Shooters World 50 BMG | <<locked>> | 84% | 46,992 psi | 70% | 2703 fps | 95.2% |
| Shooters World 50 BMG | <<locked>> | 84% | 47,137 psi | 71% | 2707 fps | 95.2% |
| SNPE Vectan SP 13 | <<locked>> | 84% | 36,724 psi | 55% | 2530 fps | 95% |
| SNPE Vectan SP 13 | <<locked>> | 86% | 39,117 psi | 59% | 2582 fps | 95.9% |
| SNPE Vectan SP 13 | <<locked>> | 84% | 36,724 psi | 55% | 2530 fps | 95% |
| Vihtavuori 20N29 | <<locked>> | 92% | 42,540 psi | 64% | 2674 fps | 95.4% |
| Vihtavuori 20N29 | <<locked>> | 92% | 42,395 psi | 64% | 2671 fps | 95.3% |
| Vihtavuori 20N29 | <<locked>> | 92% | 42,540 psi | 64% | 2674 fps | 95.4% |
| Vihtavuori 24N41 | <<locked>> | 90% | 50,662 psi | 76% | 2818 fps | 95.6% |
| Vihtavuori 24N41 | <<locked>> | 90% | 50,531 psi | 76% | 2818 fps | 95.6% |
| Vihtavuori 24N41 | <<locked>> | 90% | 50,662 psi | 76% | 2818 fps | 95.6% |
| Vihtavuori N165 | <<locked>> | 80% | 53,098 psi | 80% | 2766 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 52,895 psi | 79% | 2762 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 53,098 psi | 80% | 2766 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 46,006 psi | 69% | 2694 fps | 97.4% |
| Vihtavuori N170 | <<locked>> | 80% | 45,847 psi | 69% | 2690 fps | 97.4% |
| Vihtavuori N170 | <<locked>> | 80% | 46,006 psi | 69% | 2694 fps | 97.4% |
| Vihtavuori N565 | <<locked>> | 80% | 50,589 psi | 76% | 2808 fps | 100% |
| Vihtavuori N565 | <<locked>> | 80% | 50,401 psi | 76% | 2805 fps | 100% |
| Vihtavuori N565 | <<locked>> | 80% | 50,589 psi | 76% | 2808 fps | 100% |
| Vihtavuori N568 | <<locked>> | 80% | 45,861 psi | 69% | 2766 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 80% | 45,672 psi | 68% | 2762 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 80% | 45,861 psi | 69% | 2766 fps | 99.4% |
| Vihtavuori N570 | 83.3 gr | 80% | 43,976 psi | 66% | 2762 fps | 97.8% |
| Vihtavuori N570 | 83.3 gr | 80% | 43,772 psi | 66% | 2762 fps | 97.8% |
| Vihtavuori N570 | 83.3 gr | 80% | 43,976 psi | 66% | 2762 fps | 97.8% |
| Winchester Supreme 780 | <<locked>> | 80% | 55,985 psi | 84% | 2822 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 55,782 psi | 84% | 2818 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 55,985 psi | 84% | 2822 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 116 powders for 7.21 Firebird loaded with the .284 | 185gr | Nosler RDF. ADI AR 2218 delivers the highest muzzle velocity at 3,051 fps; across all powders the maximum-charge window runs from 1,864 fps to 3,051 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 116 of the 116 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 185.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, 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, Ramshot LRT rank at the top here: for 7.21 Firebird with the .284 | 185gr | Nosler RDF 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.