Load Specifications
Load data in caliber 7 mm STW with .284 | 140gr | Sierra GameKing bullet and 74 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>> | 94% | 59,770 psi | 90% | 3045 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,739 psi | 85% | 3028 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 58,900 psi | 88% | 3150 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 90% | 57,667 psi | 86% | 3084 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 59,727 psi | 90% | 3150 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,896 psi | 81% | 3048 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,385 psi | 73% | 3002 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,653 psi | 86% | 3084 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,842 psi | 88% | 3094 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,188 psi | 86% | 3071 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 94% | 59,843 psi | 90% | 3143 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,363 psi | 86% | 3054 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,130 psi | 86% | 3117 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 58,291 psi | 87% | 3146 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,014 psi | 85% | 3041 fps | 96.6% |
| Bofors RP15 | <<locked>> | 96% | 58,711 psi | 88% | 3127 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,826 psi | 85% | 3117 fps | 99.3% |
| Bofors RP5 | <<locked>> | 94% | 59,843 psi | 90% | 3143 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 58,363 psi | 87% | 3025 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 59,393 psi | 89% | 3136 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 84% | 58,305 psi | 87% | 3081 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,840 psi | 85% | 3035 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 59,161 psi | 89% | 3084 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,972 psi | 87% | 3064 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,870 psi | 87% | 2999 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 60,002 psi | 90% | 3258 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 59,277 psi | 89% | 3114 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,202 psi | 56% | 1955 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,666 psi | 85% | 3009 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 59,843 psi | 90% | 3048 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,087 psi | 86% | 3015 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 59,756 psi | 90% | 3064 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 94% | 57,580 psi | 86% | 3127 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,874 psi | 66% | 2900 fps | 96.6% |
| Lovex S065 | <<locked>> | 84% | 57,043 psi | 86% | 2992 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 59,074 psi | 89% | 3045 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,377 psi | 86% | 3012 fps | 100% |
| Norma 204 | <<locked>> | 86% | 58,015 psi | 87% | 3068 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 44,164 psi | 66% | 2927 fps | 98.7% |
| Norma MRP | <<locked>> | 92% | 60,089 psi | 90% | 3166 fps | 100% |
| Norma URP | <<locked>> | 86% | 58,769 psi | 88% | 3061 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 58,682 psi | 88% | 3150 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 57,667 psi | 86% | 3064 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,261 psi | 86% | 3077 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,985 psi | 57% | 2001 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,971 psi | 85% | 3048 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 59,524 psi | 89% | 3133 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,130 psi | 86% | 3186 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,565 psi | 85% | 3140 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 82% | 60,031 psi | 90% | 3022 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 58,450 psi | 88% | 3051 fps | 99% |
| Rottweil R 905 | <<locked>> | 90% | 56,695 psi | 85% | 3058 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 58,363 psi | 87% | 3025 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,043 psi | 86% | 2992 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 59,074 psi | 89% | 3045 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 59,117 psi | 89% | 2884 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 60,046 psi | 90% | 2999 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 60,104 psi | 90% | 3114 fps | 99.8% |
| Somchem S355 | <<locked>> | 82% | 59,451 psi | 89% | 3015 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 56,492 psi | 85% | 2982 fps | 98.3% |
| Somchem S365 | <<locked>> | 88% | 59,828 psi | 90% | 3064 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,305 psi | 86% | 3031 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 57,014 psi | 85% | 2933 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,681 psi | 85% | 2999 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,898 psi | 85% | 3009 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 86% | 59,582 psi | 89% | 3054 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 59,321 psi | 89% | 3081 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 59,582 psi | 89% | 3163 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 98% | 59,944 psi | 90% | 3140 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,971 psi | 85% | 3136 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,333 psi | 84% | 2949 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 58,305 psi | 87% | 3081 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,304 psi | 84% | 3136 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,246 psi | 86% | 3025 fps | 99.5% |
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% | 37,086 psi | 56% | 2644 fps | 97.8% |
| Accurate 4350 | <<locked>> | 80% | 49,385 psi | 74% | 2910 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 47,311 psi | 71% | 2946 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 41,104 psi | 62% | 2779 fps | 96.5% |
| ADI AR 2213 | <<locked>> | 84% | 42,090 psi | 63% | 2825 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 92% | 40,886 psi | 61% | 2789 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 88% | 32,300 psi | 48% | 2615 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,123 psi | 71% | 2917 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,824 psi | 82% | 3035 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,089 psi | 62% | 2772 fps | 96.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,956 psi | 55% | 2707 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,665 psi | 53% | 2674 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,966 psi | 46% | 2575 fps | 96.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,639 psi | 59% | 2818 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,577 psi | 80% | 2982 fps | 95.8% |
| Bofors RP15 | <<locked>> | 84% | 39,363 psi | 59% | 2762 fps | 95.9% |
| Bofors RP30 | <<locked>> | 90% | 40,263 psi | 60% | 2802 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 36,956 psi | 55% | 2707 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 51,401 psi | 77% | 2913 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 39,088 psi | 59% | 2753 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 50,894 psi | 76% | 2959 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 53,171 psi | 80% | 2976 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 45,005 psi | 67% | 2835 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 44,092 psi | 66% | 2815 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,483 psi | 67% | 2792 fps | 100% |
| Hodgdon Retumbo | 70.6 gr | 86% | 36,999 psi | 55% | 2789 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 51,111 psi | 77% | 2986 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,862 psi | 42% | 1755 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,876 psi | 70% | 2841 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,678 psi | 79% | 2933 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 46,818 psi | 70% | 2851 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 43,453 psi | 65% | 2772 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 84% | 40,640 psi | 61% | 2805 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,944 psi | 61% | 2835 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 50,372 psi | 76% | 2884 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 48,718 psi | 73% | 2874 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 31,937 psi | 48% | 2516 fps | 96% |
| Norma 204 | <<locked>> | 80% | 47,123 psi | 71% | 2881 fps | 97.9% |
| Norma 217 | <<locked>> | 94% | 35,853 psi | 54% | 2736 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 39,030 psi | 59% | 2782 fps | 97.4% |
| Norma URP | <<locked>> | 80% | 48,167 psi | 72% | 2894 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 40,495 psi | 61% | 2812 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 47,050 psi | 71% | 2887 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 36,289 psi | 54% | 2684 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,471 psi | 43% | 1795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,414 psi | 74% | 2927 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,761 psi | 72% | 2949 fps | 100% |
| ReloadSwiss RS 76 | 73.8 gr | 84% | 33,866 psi | 51% | 2690 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,701 psi | 67% | 2923 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 56,275 psi | 84% | 2969 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 42,293 psi | 63% | 2759 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 40,466 psi | 61% | 2756 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 80% | 51,401 psi | 77% | 2913 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,372 psi | 76% | 2884 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 48,718 psi | 73% | 2874 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 55,666 psi | 83% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,356 psi | 74% | 2831 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,132 psi | 60% | 2749 fps | 96.3% |
| Somchem S355 | <<locked>> | 80% | 55,811 psi | 84% | 2963 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 43,221 psi | 65% | 2743 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 45,498 psi | 68% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,031 psi | 62% | 2740 fps | 97.5% |
| Vihtavuori N150 | <<locked>> | 80% | 53,519 psi | 80% | 2884 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,588 psi | 74% | 2887 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,607 psi | 53% | 2605 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 48,936 psi | 73% | 2887 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,885 psi | 60% | 2749 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 45,020 psi | 67% | 2904 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 88% | 42,424 psi | 64% | 2825 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 94% | 45,803 psi | 69% | 2936 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,994 psi | 73% | 2841 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,068 psi | 77% | 2963 fps | 99.6% |
| Winchester StaBALL HD | 67.4 gr | 80% | 32,111 psi | 48% | 2690 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,594 psi | 56% | 2661 fps | 95.4% |
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 79 powders for 7 mm STW loaded with the .284 | 140gr | Sierra GameKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,258 fps; across all powders the maximum-charge window runs from 1,955 fps to 3,258 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 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 140.0 gr projectile in 0.284" calls for a 1:10.0 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 .284 | 140gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-33, 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.