Load Specifications
Load data in caliber 7.21 Firebird with .284 | 130gr | CutEdge ESP Raptor bullet and 58 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N570 and Alliant Reloder-33.
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>> | 88% | 58,581 psi | 88% | 3278 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 57,943 psi | 87% | 3396 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 86% | 59,915 psi | 90% | 3383 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 58,798 psi | 88% | 3399 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 96% | 57,914 psi | 87% | 3369 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 59,045 psi | 89% | 3501 fps | 98.8% |
| ADI AR 2225 | <<locked>> | 98% | 57,145 psi | 86% | 3386 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 59,828 psi | 90% | 3366 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 59,393 psi | 89% | 3369 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 59,088 psi | 89% | 3392 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,971 psi | 85% | 3284 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,769 psi | 87% | 3363 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 58,059 psi | 87% | 3376 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,637 psi | 85% | 3396 fps | 98% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,304 psi | 84% | 3373 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 59,190 psi | 89% | 3346 fps | 98.5% |
| Bofors RP15 | <<locked>> | 90% | 58,247 psi | 87% | 3373 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 57,551 psi | 86% | 3379 fps | 99.9% |
| Bofors RP5 | <<locked>> | 88% | 59,088 psi | 89% | 3392 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 59,654 psi | 89% | 3396 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,537 psi | 86% | 3323 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,391 psi | 85% | 3304 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 59,930 psi | 90% | 3274 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,290 psi | 86% | 3461 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,579 psi | 56% | 2188 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,986 psi | 87% | 3291 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 58,740 psi | 88% | 3291 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,566 psi | 86% | 3297 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 88% | 57,101 psi | 86% | 3376 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,927 psi | 84% | 3360 fps | 99.8% |
| Lovex S070 | <<locked>> | 82% | 60,046 psi | 90% | 3323 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 56,492 psi | 85% | 3245 fps | 100% |
| Norma 204 | <<locked>> | 82% | 59,582 psi | 89% | 3360 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,348 psi | 86% | 3386 fps | 100% |
| Norma MRP | <<locked>> | 86% | 59,379 psi | 89% | 3406 fps | 100% |
| Norma URP | <<locked>> | 82% | 60,336 psi | 90% | 3340 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 58,711 psi | 88% | 3406 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 59,567 psi | 89% | 3346 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 57,087 psi | 86% | 3317 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,551 psi | 58% | 2241 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 58,610 psi | 88% | 3445 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,769 psi | 87% | 3402 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 86% | 60,133 psi | 90% | 3346 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 59,132 psi | 89% | 3360 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 60,046 psi | 90% | 3323 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 58,740 psi | 88% | 3353 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 57,972 psi | 87% | 3268 fps | 99.5% |
| Somchem S365 | <<locked>> | 82% | 58,363 psi | 87% | 3284 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 59,480 psi | 89% | 3320 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 59,727 psi | 90% | 3307 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 59,277 psi | 89% | 3327 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 86% | 58,450 psi | 88% | 3314 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 58,711 psi | 88% | 3412 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 92% | 59,785 psi | 90% | 3396 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 94% | 58,015 psi | 87% | 3406 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 96% | 59,480 psi | 89% | 3478 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,885 psi | 87% | 3379 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 59,727 psi | 90% | 3320 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% | 44,324 psi | 66% | 3028 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 46,514 psi | 70% | 3173 fps | 97.2% |
| ADI AR 2209 | <<locked>> | 80% | 48,704 psi | 73% | 3186 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 44,019 psi | 66% | 3117 fps | 97.7% |
| ADI AR 2217 | <<locked>> | 84% | 37,521 psi | 56% | 2949 fps | 96% |
| ADI AR 2218 | <<locked>> | 94% | 46,847 psi | 70% | 3248 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 29,747 psi | 45% | 2759 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 55,970 psi | 84% | 3307 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,602 psi | 73% | 3176 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,672 psi | 67% | 3120 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,352 psi | 65% | 3051 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,521 psi | 56% | 2972 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,676 psi | 74% | 3238 fps | 100% |
| Alliant Reloder-33 | 103.7 gr | 92% | 48,269 psi | 72% | 3232 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 96% | 48,095 psi | 72% | 3212 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,339 psi | 68% | 3084 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 41,481 psi | 62% | 3045 fps | 97.9% |
| Bofors RP30 | <<locked>> | 82% | 37,478 psi | 56% | 2959 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 44,672 psi | 67% | 3120 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 35,447 psi | 53% | 2894 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 46,470 psi | 70% | 3114 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,687 psi | 68% | 3100 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,286 psi | 78% | 3159 fps | 100% |
| Hodgdon Retumbo | 83.6 gr | 80% | 36,593 psi | 55% | 3012 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,152 psi | 42% | 1969 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 54,259 psi | 81% | 3232 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 54,882 psi | 82% | 3232 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,282 psi | 71% | 3107 fps | 98% |
| IMR 7828 SSC | <<locked>> | 80% | 42,627 psi | 64% | 3091 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 88% | 36,448 psi | 55% | 2943 fps | 95.4% |
| Lovex S070 | <<locked>> | 80% | 56,376 psi | 85% | 3264 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 37,826 psi | 57% | 2884 fps | 99% |
| Norma 204 | <<locked>> | 80% | 55,637 psi | 83% | 3291 fps | 99.9% |
| Norma 217 | <<locked>> | 84% | 31,749 psi | 48% | 2828 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 47,703 psi | 72% | 3199 fps | 99.8% |
| Norma URP | <<locked>> | 80% | 56,565 psi | 85% | 3281 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 43,033 psi | 65% | 3107 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 80% | 55,738 psi | 84% | 3287 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 38,711 psi | 58% | 2963 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,950 psi | 43% | 2014 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,158 psi | 54% | 2986 fps | 98.4% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 42,090 psi | 63% | 3087 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 49,356 psi | 74% | 3156 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 80% | 48,080 psi | 72% | 3163 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 56,376 psi | 85% | 3264 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,732 psi | 72% | 3156 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 50,546 psi | 76% | 3136 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 54,389 psi | 82% | 3225 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 48,544 psi | 73% | 3133 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 42,438 psi | 64% | 2992 fps | 98.8% |
| Vihtavuori N170 | <<locked>> | 90% | 51,401 psi | 77% | 3186 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 47,747 psi | 72% | 3136 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,297 psi | 71% | 3196 fps | 98% |
| Vihtavuori N565 | <<locked>> | 80% | 39,015 psi | 58% | 2976 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 86% | 43,047 psi | 65% | 3107 fps | 95.9% |
| Vihtavuori N570 | 97.6 gr | 90% | 47,485 psi | 71% | 3241 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,163 psi | 63% | 3110 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,889 psi | 67% | 3054 fps | 98.8% |
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 58 powders for 7.21 Firebird loaded with the .284 | 130gr | CutEdge ESP Raptor. ADI AR 2218 delivers the highest muzzle velocity at 3,501 fps; across all powders the maximum-charge window runs from 2,188 fps to 3,501 fps. ADI AR 2218 gives the best case fill at 100 %, and 58 of the 58 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (460 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 130.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, Alliant Reloder-50, 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. Hodgdon Retumbo, Vihtavuori N570, Alliant Reloder-33 rank at the top here: for 7.21 Firebird with the .284 | 130gr | CutEdge ESP Raptor 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.