Load Specifications
Load data in caliber 7.21 Firebird with .284 | 110gr | Barnes TTSX FB bullet and 69 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Vihtavuori N560.
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% | 56,623 psi | 85% | 3451 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,695 psi | 85% | 3494 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 60,321 psi | 90% | 3635 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 88% | 58,305 psi | 87% | 3566 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 90% | 56,898 psi | 85% | 3570 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 59,785 psi | 90% | 3599 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,215 psi | 81% | 3543 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,073 psi | 87% | 3563 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,783 psi | 87% | 3550 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,159 psi | 86% | 3563 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 92% | 58,653 psi | 88% | 3527 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 59,364 psi | 89% | 3602 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 60,205 psi | 90% | 3625 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 58,233 psi | 87% | 3612 fps | 97% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,986 psi | 87% | 3514 fps | 97.1% |
| Bofors RP15 | <<locked>> | 94% | 60,336 psi | 90% | 3615 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 59,074 psi | 89% | 3602 fps | 99.5% |
| Bofors RP5 | <<locked>> | 90% | 57,159 psi | 86% | 3563 fps | 99.6% |
| Bofors RP7 | <<locked>> | 82% | 57,972 psi | 87% | 3497 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 96% | 57,145 psi | 86% | 3556 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 82% | 58,537 psi | 88% | 3556 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 60,147 psi | 90% | 3566 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 90% | 58,972 psi | 88% | 3547 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,305 psi | 87% | 3471 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 58,334 psi | 87% | 3694 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 60,176 psi | 90% | 3596 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,246 psi | 56% | 2352 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,724 psi | 85% | 3474 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 59,524 psi | 89% | 3527 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,145 psi | 86% | 3481 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 60,234 psi | 90% | 3543 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 92% | 59,001 psi | 88% | 3615 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,182 psi | 74% | 3425 fps | 98% |
| Lovex S065 | <<locked>> | 82% | 56,797 psi | 85% | 3461 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 58,972 psi | 88% | 3517 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 58,175 psi | 87% | 3478 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,363 psi | 87% | 3543 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 50,038 psi | 75% | 3458 fps | 99.6% |
| Norma MRP | <<locked>> | 88% | 57,159 psi | 86% | 3579 fps | 100% |
| Norma URP | <<locked>> | 84% | 58,972 psi | 88% | 3537 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,144 psi | 84% | 3563 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 84% | 58,175 psi | 87% | 3537 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 59,466 psi | 89% | 3553 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,116 psi | 57% | 2405 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,232 psi | 86% | 3510 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,072 psi | 84% | 3543 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 60,249 psi | 90% | 3681 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 59,770 psi | 90% | 3632 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 88% | 58,871 psi | 88% | 3527 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 88% | 57,377 psi | 86% | 3537 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 82% | 57,972 psi | 87% | 3497 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,797 psi | 85% | 3461 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 58,972 psi | 88% | 3517 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 59,698 psi | 89% | 3461 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,014 psi | 85% | 3530 fps | 99.6% |
| Somchem S361 | <<locked>> | 86% | 56,884 psi | 85% | 3442 fps | 98.5% |
| Somchem S365 | <<locked>> | 84% | 56,333 psi | 84% | 3474 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,798 psi | 87% | 3497 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 82% | 56,637 psi | 85% | 3461 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,914 psi | 87% | 3481 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 59,843 psi | 90% | 3524 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,449 psi | 85% | 3501 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,652 psi | 85% | 3576 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 94% | 57,580 psi | 86% | 3556 fps | 98.9% |
| Vihtavuori N568 | <<locked>> | 98% | 59,828 psi | 90% | 3632 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,710 psi | 85% | 3402 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 58,726 psi | 88% | 3563 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 59,059 psi | 89% | 3619 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 58,204 psi | 87% | 3497 fps | 99.7% |
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% | 39,624 psi | 59% | 3110 fps | 98.4% |
| Accurate 4350 | <<locked>> | 80% | 52,765 psi | 79% | 3425 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 44,773 psi | 67% | 3320 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 44,063 psi | 66% | 3278 fps | 97.2% |
| ADI AR 2213 | <<locked>> | 82% | 42,424 psi | 64% | 3261 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 90% | 41,510 psi | 62% | 3225 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 86% | 32,677 psi | 49% | 3015 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,560 psi | 76% | 3435 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,961 psi | 66% | 3264 fps | 97.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,856 psi | 60% | 3189 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,508 psi | 58% | 3143 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,214 psi | 50% | 3035 fps | 97.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,729 psi | 66% | 3320 fps | 99.8% |
| Alliant Reloder-33 | <<locked>> | 98% | 53,925 psi | 81% | 3530 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 50,604 psi | 76% | 3373 fps | 95.2% |
| Bofors RP15 | <<locked>> | 82% | 39,755 psi | 60% | 3186 fps | 95.8% |
| Bofors RP30 | <<locked>> | 88% | 41,191 psi | 62% | 3232 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 39,856 psi | 60% | 3189 fps | 96% |
| Bofors RP7 | <<locked>> | 80% | 54,389 psi | 82% | 3432 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 39,407 psi | 59% | 3176 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 54,534 psi | 82% | 3488 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 82% | 45,136 psi | 68% | 3271 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 82% | 44,367 psi | 67% | 3251 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,514 psi | 71% | 3287 fps | 100% |
| Hodgdon Retumbo | 88.7 gr | 84% | 37,449 psi | 56% | 3215 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 55,753 psi | 84% | 3520 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,818 psi | 42% | 2116 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,821 psi | 75% | 3350 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 55,753 psi | 84% | 3461 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,966 psi | 75% | 3356 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,294 psi | 65% | 3202 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 82% | 40,886 psi | 61% | 3232 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 96% | 42,525 psi | 64% | 3274 fps | 96.1% |
| Lovex S065 | <<locked>> | 80% | 53,185 psi | 80% | 3396 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,605 psi | 77% | 3386 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 33,852 psi | 51% | 2956 fps | 96.4% |
| Norma 204 | <<locked>> | 80% | 50,676 psi | 76% | 3402 fps | 98.6% |
| Norma 217 | <<locked>> | 90% | 34,403 psi | 52% | 3077 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 42,438 psi | 64% | 3278 fps | 98.1% |
| Norma URP | <<locked>> | 80% | 51,416 psi | 77% | 3409 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 40,901 psi | 61% | 3241 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 50,662 psi | 76% | 3406 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 82% | 36,782 psi | 55% | 3087 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,514 psi | 43% | 2169 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,243 psi | 80% | 3445 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,011 psi | 78% | 3474 fps | 100% |
| ReloadSwiss RS 76 | 92.7 gr | 82% | 34,374 psi | 52% | 3097 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 46,717 psi | 70% | 3373 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 44,933 psi | 67% | 3251 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 80% | 43,381 psi | 65% | 3251 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 80% | 54,389 psi | 82% | 3432 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,185 psi | 80% | 3396 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,605 psi | 77% | 3386 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,156 psi | 78% | 3333 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,047 psi | 65% | 3248 fps | 97.1% |
| Somchem S361 | <<locked>> | 80% | 46,122 psi | 69% | 3232 fps | 96.2% |
| Somchem S365 | <<locked>> | 80% | 48,994 psi | 73% | 3353 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,816 psi | 66% | 3225 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 80% | 52,866 psi | 79% | 3399 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,101 psi | 57% | 3071 fps | 96.2% |
| Vihtavuori N550 | <<locked>> | 80% | 52,243 psi | 78% | 3399 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,844 psi | 64% | 3241 fps | 99.9% |
| Vihtavuori N560 | 89.9 gr | 82% | 45,556 psi | 68% | 3346 fps | 96% |
| Vihtavuori N565 | <<locked>> | 86% | 43,207 psi | 65% | 3258 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 92% | 47,674 psi | 71% | 3392 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,707 psi | 79% | 3337 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,708 psi | 82% | 3491 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,114 psi | 54% | 3176 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,335 psi | 60% | 3133 fps | 96.3% |
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 69 powders for 7.21 Firebird loaded with the .284 | 110gr | Barnes TTSX FB. Hodgdon Retumbo delivers the highest muzzle velocity at 3,694 fps; across all powders the maximum-charge window runs from 2,352 fps to 3,694 fps. ADI AR 2217 gives the best case fill at 100 %, and 69 of the 69 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 110.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-33 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, ReloadSwiss RS 76, Vihtavuori N560 rank at the top here: for 7.21 Firebird with the .284 | 110gr | Barnes TTSX FB 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.