Load Specifications
Load data in caliber 7 mm STW with .284 | 145gr | Prvi Partizan SP bullet and 73 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 59,451 psi | 89% | 2999 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 60,017 psi | 90% | 3025 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 58,146 psi | 87% | 3097 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 88% | 56,884 psi | 85% | 3031 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 59,059 psi | 89% | 3100 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,392 psi | 86% | 3064 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,750 psi | 78% | 3018 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 57,072 psi | 86% | 3025 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,913 psi | 85% | 3025 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 60,278 psi | 90% | 3074 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 59,292 psi | 89% | 3091 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,087 psi | 86% | 3005 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,072 psi | 86% | 3068 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,812 psi | 87% | 3091 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,998 psi | 82% | 3077 fps | 96.6% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 59,799 psi | 90% | 3051 fps | 97.7% |
| Bofors RP15 | <<locked>> | 94% | 58,421 psi | 88% | 3077 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 56,855 psi | 85% | 3074 fps | 99.5% |
| Bofors RP5 | <<locked>> | 92% | 59,292 psi | 89% | 3091 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 57,276 psi | 86% | 2969 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 59,059 psi | 89% | 3087 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 57,450 psi | 86% | 3025 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 59,495 psi | 89% | 3035 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 58,392 psi | 88% | 3031 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,246 psi | 86% | 3015 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,232 psi | 86% | 2946 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 59,828 psi | 90% | 3209 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 58,276 psi | 87% | 3054 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,463 psi | 56% | 1939 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 59,379 psi | 89% | 3009 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 58,726 psi | 88% | 2992 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 60,118 psi | 90% | 3015 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 58,885 psi | 88% | 3012 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 92% | 57,145 psi | 86% | 3077 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,152 psi | 71% | 2923 fps | 98% |
| Lovex S065 | <<locked>> | 84% | 59,611 psi | 89% | 2989 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 58,073 psi | 87% | 2986 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,826 psi | 85% | 2959 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,927 psi | 85% | 3012 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 47,906 psi | 72% | 2949 fps | 99.6% |
| Norma MRP | <<locked>> | 90% | 59,582 psi | 89% | 3114 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,885 psi | 87% | 3005 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 58,276 psi | 87% | 3100 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 56,753 psi | 85% | 3009 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,869 psi | 85% | 3025 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,290 psi | 57% | 1982 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 60,118 psi | 90% | 3048 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 58,653 psi | 88% | 3074 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,913 psi | 85% | 3136 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,507 psi | 85% | 3094 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 88% | 57,725 psi | 87% | 2999 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 90% | 59,959 psi | 90% | 3064 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 57,276 psi | 86% | 2969 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 59,611 psi | 89% | 2989 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 58,073 psi | 87% | 2986 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 58,813 psi | 88% | 2943 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 59,524 psi | 89% | 3064 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 59,350 psi | 89% | 2989 fps | 99% |
| Somchem S365 | <<locked>> | 86% | 59,059 psi | 89% | 3005 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,565 psi | 85% | 2979 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 59,640 psi | 89% | 2923 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 59,654 psi | 89% | 2995 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 60,162 psi | 90% | 3015 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 58,813 psi | 88% | 2999 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 59,045 psi | 89% | 3031 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 59,074 psi | 89% | 3114 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 96% | 59,596 psi | 89% | 3094 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 56,913 psi | 85% | 3094 fps | 98.3% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,986 psi | 87% | 3150 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 59,263 psi | 89% | 2943 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,450 psi | 86% | 3025 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,405 psi | 85% | 3087 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,492 psi | 85% | 2972 fps | 99.7% |
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% | 39,436 psi | 59% | 2657 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 52,228 psi | 78% | 2913 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 43,714 psi | 66% | 2831 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 43,323 psi | 65% | 2785 fps | 97.6% |
| ADI AR 2213 | <<locked>> | 82% | 41,582 psi | 62% | 2776 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 90% | 40,625 psi | 61% | 2749 fps | 96% |
| ADI AR 2225 | <<locked>> | 86% | 32,213 psi | 48% | 2579 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,801 psi | 66% | 2789 fps | 97.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,734 psi | 75% | 2913 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,395 psi | 65% | 2782 fps | 97.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,320 psi | 59% | 2723 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,985 psi | 57% | 2680 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,837 psi | 49% | 2592 fps | 97.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,656 psi | 64% | 2835 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 50,995 psi | 76% | 3005 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 49,443 psi | 74% | 2871 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 36,666 psi | 55% | 2657 fps | 95.4% |
| Bofors RP30 | <<locked>> | 86% | 37,492 psi | 56% | 2700 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 39,320 psi | 59% | 2723 fps | 96.5% |
| Bofors RP7 | <<locked>> | 80% | 53,867 psi | 81% | 2913 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 38,580 psi | 58% | 2703 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 53,534 psi | 80% | 2963 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 55,753 psi | 84% | 2976 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 41,452 psi | 62% | 2723 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 82% | 43,540 psi | 65% | 2766 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,949 psi | 70% | 2792 fps | 100% |
| Hodgdon Retumbo | 69.1 gr | 82% | 34,301 psi | 51% | 2674 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 54,244 psi | 81% | 2995 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,021 psi | 42% | 1736 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,052 psi | 74% | 2841 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 55,085 psi | 83% | 2933 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,429 psi | 74% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,699 psi | 64% | 2720 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 82% | 40,263 psi | 60% | 2756 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 94% | 38,348 psi | 57% | 2733 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 52,591 psi | 79% | 2881 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,169 psi | 77% | 2877 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 33,837 psi | 51% | 2530 fps | 97.2% |
| Norma 204 | <<locked>> | 80% | 49,763 psi | 75% | 2890 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 33,576 psi | 50% | 2635 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 41,568 psi | 62% | 2795 fps | 98.4% |
| Norma URP | <<locked>> | 80% | 50,807 psi | 76% | 2897 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 40,176 psi | 60% | 2766 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 49,763 psi | 75% | 2894 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 33,388 psi | 50% | 2572 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,645 psi | 43% | 1775 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,373 psi | 79% | 2933 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,792 psi | 76% | 2956 fps | 100% |
| ReloadSwiss RS 76 | 74 gr | 82% | 33,663 psi | 50% | 2651 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 44,686 psi | 67% | 2881 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 44,353 psi | 66% | 2762 fps | 96.8% |
| Rottweil R 905 | <<locked>> | 80% | 42,888 psi | 64% | 2769 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 80% | 53,867 psi | 81% | 2913 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,591 psi | 79% | 2881 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,169 psi | 77% | 2877 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,517 psi | 77% | 2831 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,554 psi | 64% | 2762 fps | 97.5% |
| Somchem S361 | <<locked>> | 80% | 45,469 psi | 68% | 2753 fps | 96.4% |
| Somchem S365 | <<locked>> | 80% | 48,167 psi | 72% | 2848 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,366 psi | 65% | 2746 fps | 98.4% |
| Vihtavuori N150 | <<locked>> | 80% | 56,086 psi | 84% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 52,185 psi | 78% | 2887 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,782 psi | 57% | 2618 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 80% | 51,648 psi | 77% | 2890 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,496 psi | 64% | 2762 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,437 psi | 62% | 2785 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 86% | 42,264 psi | 63% | 2782 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 92% | 45,701 psi | 69% | 2890 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 98% | 54,012 psi | 81% | 3084 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,605 psi | 77% | 2838 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,766 psi | 81% | 2966 fps | 99.9% |
| Winchester StaBALL HD | 69.3 gr | 80% | 35,244 psi | 53% | 2717 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,798 psi | 60% | 2671 fps | 96.7% |
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 73 powders for 7 mm STW loaded with the .284 | 145gr | Prvi Partizan SP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,209 fps; across all powders the maximum-charge window runs from 1,939 fps to 3,209 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 145.0 gr projectile in 0.284" calls for a 1:13.0 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, Winchester StaBALL HD rank at the top here: for 7 mm STW with the .284 | 145gr | Prvi Partizan SP 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.