Load Specifications
Load data in caliber 7 mm STW with .285 | 139gr | Prvi Partizan SP bullet and 72 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 Winchester StaBALL HD.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 59,393 psi | 89% | 3048 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 59,857 psi | 90% | 3081 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 58,160 psi | 87% | 3146 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 88% | 56,840 psi | 85% | 3081 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 92% | 58,972 psi | 88% | 3150 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,276 psi | 86% | 3110 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,779 psi | 78% | 3068 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,898 psi | 85% | 3081 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 60,321 psi | 90% | 3130 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 59,219 psi | 89% | 3143 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,101 psi | 86% | 3054 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,116 psi | 86% | 3120 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,914 psi | 87% | 3143 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,187 psi | 83% | 3127 fps | 96.3% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 59,872 psi | 90% | 3100 fps | 97.5% |
| Bofors RP15 | <<locked>> | 94% | 58,349 psi | 87% | 3127 fps | 99.7% |
| Bofors RP30 | <<locked>> | 98% | 57,014 psi | 85% | 3127 fps | 99.4% |
| Bofors RP5 | <<locked>> | 92% | 59,219 psi | 89% | 3143 fps | 99.8% |
| Bofors RP7 | <<locked>> | 82% | 57,305 psi | 86% | 3022 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 59,176 psi | 89% | 3143 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 57,305 psi | 86% | 3074 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 59,422 psi | 89% | 3091 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 90% | 58,363 psi | 87% | 3084 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,261 psi | 86% | 3064 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,130 psi | 86% | 2999 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 59,973 psi | 90% | 3261 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 58,291 psi | 87% | 3110 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,304 psi | 56% | 1982 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 59,379 psi | 89% | 3061 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 58,537 psi | 88% | 3041 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 59,930 psi | 90% | 3064 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 58,740 psi | 88% | 3061 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 92% | 57,043 psi | 86% | 3127 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,311 psi | 71% | 2969 fps | 97.7% |
| Lovex S065 | <<locked>> | 84% | 59,582 psi | 89% | 3041 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,986 psi | 87% | 3041 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,869 psi | 85% | 3012 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,913 psi | 85% | 3061 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 48,037 psi | 72% | 2999 fps | 99.4% |
| Norma MRP | <<locked>> | 90% | 59,480 psi | 89% | 3163 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,812 psi | 87% | 3058 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 58,320 psi | 87% | 3150 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 56,739 psi | 85% | 3061 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,985 psi | 85% | 3077 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,276 psi | 57% | 2031 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 60,002 psi | 90% | 3097 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 58,711 psi | 88% | 3127 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,029 psi | 85% | 3189 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,536 psi | 85% | 3140 fps | 98.5% |
| Rottweil R 904 | <<locked>> | 88% | 57,696 psi | 86% | 3051 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 60,046 psi | 90% | 3120 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 57,305 psi | 86% | 3022 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 59,582 psi | 89% | 3041 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,986 psi | 87% | 3041 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 58,668 psi | 88% | 2992 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 59,625 psi | 89% | 3117 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 59,495 psi | 89% | 3041 fps | 98.9% |
| Somchem S365 | <<locked>> | 86% | 59,117 psi | 89% | 3058 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,652 psi | 85% | 3031 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 59,683 psi | 89% | 2979 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 59,509 psi | 89% | 3048 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 60,234 psi | 90% | 3068 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 58,842 psi | 88% | 3051 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 58,972 psi | 88% | 3081 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 58,943 psi | 88% | 3159 fps | 99% |
| Vihtavuori N565 | <<locked>> | 96% | 59,698 psi | 89% | 3143 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 98% | 57,116 psi | 86% | 3143 fps | 98.1% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 58,088 psi | 87% | 3202 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 59,321 psi | 89% | 2995 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,508 psi | 86% | 3077 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,521 psi | 85% | 3140 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,463 psi | 85% | 3022 fps | 99.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 39,334 psi | 59% | 2697 fps | 98.5% |
| Accurate 4350 | <<locked>> | 80% | 52,069 psi | 78% | 2963 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 47,065 psi | 71% | 2946 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 43,381 psi | 65% | 2835 fps | 97.3% |
| ADI AR 2213 | <<locked>> | 82% | 41,553 psi | 62% | 2822 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 90% | 40,524 psi | 61% | 2792 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 86% | 32,169 psi | 48% | 2618 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,676 psi | 74% | 2966 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,265 psi | 65% | 2825 fps | 97.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,334 psi | 59% | 2766 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,913 psi | 57% | 2723 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,866 psi | 49% | 2635 fps | 97.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,641 psi | 64% | 2881 fps | 99.8% |
| Alliant Reloder-33 | <<locked>> | 98% | 50,995 psi | 76% | 3051 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 52,750 psi | 79% | 2979 fps | 95.8% |
| Bofors RP15 | <<locked>> | 82% | 39,131 psi | 59% | 2759 fps | 95.9% |
| Bofors RP30 | <<locked>> | 88% | 40,190 psi | 60% | 2805 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 39,334 psi | 59% | 2766 fps | 96.2% |
| Bofors RP7 | <<locked>> | 80% | 53,780 psi | 81% | 2966 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 38,566 psi | 58% | 2746 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 53,505 psi | 80% | 3012 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 55,767 psi | 84% | 3028 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 82% | 44,324 psi | 66% | 2831 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 82% | 43,468 psi | 65% | 2812 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,876 psi | 70% | 2841 fps | 100% |
| Hodgdon Retumbo | 72.8 gr | 84% | 36,825 psi | 55% | 2789 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 54,114 psi | 81% | 3045 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,963 psi | 42% | 1778 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,139 psi | 74% | 2894 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,969 psi | 82% | 2989 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,298 psi | 74% | 2904 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,743 psi | 64% | 2769 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 82% | 40,219 psi | 60% | 2802 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 96% | 41,104 psi | 62% | 2841 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 52,518 psi | 79% | 2933 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,082 psi | 77% | 2930 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 33,866 psi | 51% | 2569 fps | 96.9% |
| Norma 204 | <<locked>> | 80% | 49,705 psi | 75% | 2940 fps | 98.6% |
| Norma 217 | <<locked>> | 90% | 33,634 psi | 50% | 2674 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 41,495 psi | 62% | 2838 fps | 98.1% |
| Norma URP | <<locked>> | 80% | 50,720 psi | 76% | 2946 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 40,045 psi | 60% | 2805 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 49,705 psi | 75% | 2943 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 82% | 36,013 psi | 54% | 2680 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,718 psi | 43% | 1821 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,272 psi | 78% | 2982 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,633 psi | 76% | 3002 fps | 100% |
| ReloadSwiss RS 76 | 76 gr | 82% | 33,591 psi | 50% | 2687 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 44,744 psi | 67% | 2923 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 44,440 psi | 67% | 2812 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 80% | 42,786 psi | 64% | 2815 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 80% | 53,780 psi | 81% | 2966 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,518 psi | 79% | 2933 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,082 psi | 77% | 2930 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,561 psi | 77% | 2884 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,453 psi | 64% | 2808 fps | 97.2% |
| Somchem S361 | <<locked>> | 80% | 45,324 psi | 68% | 2795 fps | 96.1% |
| Somchem S365 | <<locked>> | 80% | 48,225 psi | 72% | 2900 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,366 psi | 65% | 2795 fps | 98.2% |
| Vihtavuori N150 | <<locked>> | 80% | 55,956 psi | 84% | 2930 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 52,040 psi | 78% | 2936 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,637 psi | 56% | 2657 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 80% | 51,430 psi | 77% | 2940 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,409 psi | 64% | 2808 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 44,469 psi | 67% | 2894 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 86% | 42,192 psi | 63% | 2825 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 92% | 45,876 psi | 69% | 2940 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 98% | 53,940 psi | 81% | 3130 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,619 psi | 77% | 2887 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,722 psi | 81% | 3015 fps | 99.9% |
| Winchester StaBALL HD | 71.2 gr | 80% | 35,157 psi | 53% | 2756 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,769 psi | 60% | 2713 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 78 powders for 7 mm STW loaded with the .285 | 139gr | Prvi Partizan SP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,261 fps; across all powders the maximum-charge window runs from 1,982 fps to 3,261 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 139.0 gr projectile in 0.285" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, ADI AR 2225 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, Winchester StaBALL HD rank at the top here: for 7 mm STW with the .285 | 139gr | Prvi Partizan SP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, IMR 7977 Enduron burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.