Load Specifications
Load data in caliber 7.21 Firebird with .284 | 127gr | RWS Evolution Green bullet and 66 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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>> | 90% | 59,915 psi | 90% | 3327 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 59,930 psi | 90% | 3356 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 59,393 psi | 89% | 3451 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 86% | 57,276 psi | 86% | 3373 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 60,162 psi | 90% | 3451 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 58,943 psi | 88% | 3419 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,709 psi | 84% | 3465 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,740 psi | 87% | 3432 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,276 psi | 86% | 3363 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,840 psi | 85% | 3356 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 60,365 psi | 90% | 3442 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 58,059 psi | 87% | 3337 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 58,726 psi | 88% | 3412 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 59,132 psi | 89% | 3432 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,508 psi | 86% | 3445 fps | 97.9% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 52,620 psi | 79% | 3333 fps | 96.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,753 psi | 85% | 3330 fps | 97.8% |
| Bofors RP15 | <<locked>> | 92% | 59,480 psi | 89% | 3428 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 58,392 psi | 88% | 3422 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 60,365 psi | 90% | 3442 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 56,246 psi | 84% | 3373 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 88% | 58,929 psi | 88% | 3376 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,754 psi | 87% | 3356 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,334 psi | 86% | 3271 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,812 psi | 87% | 3507 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,492 psi | 56% | 2201 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 59,422 psi | 89% | 3343 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 60,075 psi | 90% | 3343 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 59,146 psi | 89% | 3353 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 58,320 psi | 87% | 3428 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,678 psi | 79% | 3333 fps | 99.4% |
| Lovex S065 | <<locked>> | 82% | 59,379 psi | 89% | 3317 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 57,870 psi | 87% | 3317 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,508 psi | 86% | 3294 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,188 psi | 86% | 3346 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 53,635 psi | 80% | 3360 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,391 psi | 85% | 3392 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,986 psi | 87% | 3337 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 59,799 psi | 90% | 3451 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 57,159 psi | 86% | 3343 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 58,305 psi | 87% | 3366 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,464 psi | 58% | 2254 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 59,451 psi | 89% | 3415 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 59,379 psi | 89% | 3494 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 58,784 psi | 88% | 3451 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 86% | 57,827 psi | 87% | 3337 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 86% | 56,608 psi | 85% | 3350 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 82% | 59,379 psi | 89% | 3317 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 57,870 psi | 87% | 3317 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 58,247 psi | 87% | 3264 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 60,191 psi | 90% | 3409 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 59,625 psi | 89% | 3320 fps | 99.5% |
| Somchem S365 | <<locked>> | 84% | 59,582 psi | 89% | 3337 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,942 psi | 85% | 3314 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 59,582 psi | 89% | 3327 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,058 psi | 86% | 3297 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,275 psi | 84% | 3304 fps | 96% |
| Vihtavuori N550 | <<locked>> | 82% | 58,856 psi | 88% | 3330 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 59,698 psi | 89% | 3366 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 59,944 psi | 90% | 3465 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 92% | 56,797 psi | 85% | 3376 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 96% | 58,958 psi | 88% | 3455 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 96% | 56,115 psi | 84% | 3448 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 59,480 psi | 89% | 3264 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 58,494 psi | 88% | 3428 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,043 psi | 86% | 3307 fps | 99.9% |
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% | 42,076 psi | 63% | 3012 fps | 99.5% |
| Accurate 4350 | <<locked>> | 80% | 55,724 psi | 84% | 3291 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 44,048 psi | 66% | 3150 fps | 96.2% |
| ADI AR 2209 | <<locked>> | 80% | 46,543 psi | 70% | 3169 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 41,756 psi | 63% | 3094 fps | 96.7% |
| ADI AR 2217 | <<locked>> | 86% | 38,247 psi | 57% | 2995 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 96% | 47,761 psi | 72% | 3294 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 82% | 30,240 psi | 45% | 2802 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,461 psi | 80% | 3301 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,369 psi | 70% | 3159 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,409 psi | 64% | 3097 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,089 psi | 62% | 3041 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,462 psi | 53% | 2953 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,833 psi | 70% | 3222 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 49,066 psi | 74% | 3281 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 98% | 48,544 psi | 73% | 3251 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 46,427 psi | 70% | 3130 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 39,436 psi | 59% | 3025 fps | 97% |
| Bofors RP30 | <<locked>> | 84% | 38,130 psi | 57% | 3009 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 42,409 psi | 64% | 3097 fps | 98% |
| Hodgdon H1000 | <<locked>> | 82% | 36,216 psi | 54% | 2943 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 80% | 44,469 psi | 67% | 3097 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,555 psi | 65% | 3077 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,140 psi | 75% | 3159 fps | 100% |
| Hodgdon Retumbo | 81.4 gr | 80% | 34,606 psi | 52% | 2982 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,094 psi | 42% | 1978 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,185 psi | 78% | 3222 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 52,591 psi | 79% | 3225 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,426 psi | 68% | 3094 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 80% | 40,451 psi | 61% | 3071 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 90% | 36,782 psi | 55% | 2982 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 55,695 psi | 83% | 3261 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 54,215 psi | 81% | 3258 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,955 psi | 54% | 2867 fps | 98.3% |
| Norma 204 | <<locked>> | 80% | 53,287 psi | 80% | 3278 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 31,995 psi | 48% | 2867 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 45,266 psi | 68% | 3182 fps | 99.5% |
| Norma URP | <<locked>> | 80% | 54,215 psi | 81% | 3274 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,553 psi | 61% | 3081 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 80% | 53,345 psi | 80% | 3281 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,347 psi | 54% | 2933 fps | 97.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,747 psi | 43% | 2024 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 55,085 psi | 83% | 3346 fps | 100% |
| ReloadSwiss RS 76 | 87.1 gr | 80% | 33,997 psi | 51% | 2949 fps | 97.2% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 42,699 psi | 64% | 3133 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 47,326 psi | 71% | 3143 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 80% | 45,890 psi | 69% | 3146 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 55,695 psi | 83% | 3261 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 54,215 psi | 81% | 3258 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 54,534 psi | 82% | 3205 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,556 psi | 68% | 3140 fps | 98.7% |
| Somchem S361 | <<locked>> | 80% | 48,443 psi | 73% | 3123 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 51,880 psi | 78% | 3222 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,311 psi | 69% | 3117 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 55,579 psi | 83% | 3264 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 40,364 psi | 61% | 2972 fps | 98% |
| Vihtavuori N170 | <<locked>> | 92% | 52,475 psi | 79% | 3232 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 54,969 psi | 82% | 3268 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 45,571 psi | 68% | 3127 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,962 psi | 67% | 3173 fps | 97.1% |
| Vihtavuori N565 | <<locked>> | 82% | 39,740 psi | 60% | 3022 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 88% | 43,700 psi | 66% | 3153 fps | 95.7% |
| Vihtavuori N570 | 97.1 gr | 92% | 48,124 psi | 72% | 3291 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 55,390 psi | 83% | 3205 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,320 psi | 59% | 3087 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,786 psi | 64% | 3038 fps | 98.1% |
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 66 powders for 7.21 Firebird loaded with the .284 | 127gr | RWS Evolution Green. Hodgdon Retumbo delivers the highest muzzle velocity at 3,507 fps; across all powders the maximum-charge window runs from 2,201 fps to 3,507 fps. ADI AR 2218 gives the best case fill at 100 %, and 66 of the 66 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 127.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-50 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 7.21 Firebird with the .284 | 127gr | RWS Evolution Green 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.