Load Specifications
Load data in caliber 7 mm STW with .284 | 150gr | Sierra GameKing bullet and 71 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 IMR 7828 SSC.
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% | 60,321 psi | 90% | 2969 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,942 psi | 85% | 2940 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 59,364 psi | 89% | 3077 fps | 99% |
| ADI AR 2209 | <<locked>> | 88% | 57,870 psi | 87% | 3005 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 60,002 psi | 90% | 3071 fps | 99.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 58,479 psi | 88% | 3041 fps | 99.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,808 psi | 79% | 2999 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,870 psi | 87% | 2995 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,406 psi | 86% | 2992 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 60,234 psi | 90% | 3064 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,943 psi | 87% | 2972 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 58,117 psi | 87% | 3041 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 59,176 psi | 89% | 3068 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,115 psi | 84% | 3061 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,971 psi | 85% | 2969 fps | 97.4% |
| Bofors RP15 | <<locked>> | 94% | 59,350 psi | 89% | 3051 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 57,928 psi | 87% | 3051 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 60,234 psi | 90% | 3064 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 58,030 psi | 87% | 2940 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 60,147 psi | 90% | 3064 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 58,363 psi | 87% | 2995 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 60,336 psi | 90% | 3009 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 59,219 psi | 89% | 3005 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 58,276 psi | 87% | 2989 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,160 psi | 87% | 2917 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 57,116 psi | 86% | 3123 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 59,408 psi | 89% | 3035 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,536 psi | 56% | 1909 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 60,263 psi | 90% | 2979 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 59,451 psi | 89% | 2959 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,203 psi | 86% | 2933 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 59,582 psi | 89% | 2986 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 92% | 58,102 psi | 87% | 3051 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,385 psi | 73% | 2907 fps | 98.5% |
| Lovex S065 | <<locked>> | 82% | 56,869 psi | 85% | 2907 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 58,900 psi | 88% | 2959 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,943 psi | 87% | 2936 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,885 psi | 87% | 2982 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 48,994 psi | 73% | 2933 fps | 99.8% |
| Norma MRP | <<locked>> | 88% | 56,565 psi | 85% | 3025 fps | 100% |
| Norma URP | <<locked>> | 84% | 58,798 psi | 88% | 2976 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 59,640 psi | 89% | 3077 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 57,725 psi | 87% | 2982 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 58,059 psi | 87% | 3002 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,377 psi | 58% | 1952 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,985 psi | 85% | 2959 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 59,756 psi | 90% | 3045 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 58,175 psi | 87% | 3117 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,609 psi | 86% | 3074 fps | 99% |
| Rottweil R 904 | <<locked>> | 88% | 58,421 psi | 88% | 2969 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 88% | 57,014 psi | 85% | 2982 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 58,030 psi | 87% | 2940 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,869 psi | 85% | 2907 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 58,900 psi | 88% | 2959 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 59,567 psi | 89% | 2913 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,608 psi | 85% | 2979 fps | 99.8% |
| Somchem S361 | <<locked>> | 86% | 56,420 psi | 85% | 2904 fps | 98.9% |
| Somchem S365 | <<locked>> | 86% | 60,118 psi | 90% | 2976 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,522 psi | 86% | 2953 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 60,321 psi | 90% | 2963 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,290 psi | 86% | 2936 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 59,741 psi | 90% | 2972 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 60,147 psi | 90% | 3005 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 60,046 psi | 90% | 3087 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 94% | 56,666 psi | 85% | 3009 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 98% | 58,131 psi | 87% | 3074 fps | 98.7% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 59,306 psi | 89% | 3136 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 60,249 psi | 90% | 2913 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 58,363 psi | 87% | 2995 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,725 psi | 87% | 3061 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,580 psi | 86% | 2949 fps | 99.8% |
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% | 40,147 psi | 60% | 2638 fps | 99.1% |
| Accurate 4350 | <<locked>> | 80% | 53,113 psi | 80% | 2884 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 44,628 psi | 67% | 2815 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 44,222 psi | 66% | 2766 fps | 98.1% |
| ADI AR 2213 | <<locked>> | 80% | 39,450 psi | 59% | 2694 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 88% | 38,638 psi | 58% | 2671 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 84% | 30,705 psi | 46% | 2507 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,778 psi | 76% | 2890 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,106 psi | 66% | 2759 fps | 98.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,030 psi | 60% | 2703 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,870 psi | 58% | 2661 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,605 psi | 50% | 2579 fps | 98.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,627 psi | 65% | 2815 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 48,153 psi | 72% | 2920 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 50,227 psi | 75% | 2851 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 37,318 psi | 56% | 2641 fps | 96% |
| Bofors RP30 | <<locked>> | 86% | 38,305 psi | 57% | 2684 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 40,030 psi | 60% | 2703 fps | 97.1% |
| Bofors RP7 | <<locked>> | 80% | 54,534 psi | 82% | 2884 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 36,666 psi | 55% | 2625 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 54,607 psi | 82% | 2940 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 56,521 psi | 85% | 2949 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 42,163 psi | 63% | 2703 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,307 psi | 62% | 2684 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,674 psi | 71% | 2766 fps | 100% |
| Hodgdon Retumbo | 68.7 gr | 82% | 35,128 psi | 53% | 2667 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 55,230 psi | 83% | 2972 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,021 psi | 42% | 1706 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,922 psi | 75% | 2818 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 55,753 psi | 84% | 2907 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 50,198 psi | 75% | 2825 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,468 psi | 65% | 2700 fps | 96.4% |
| IMR 7828 SSC | 66.9 gr | 80% | 38,203 psi | 57% | 2674 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 94% | 39,276 psi | 59% | 2723 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 53,476 psi | 80% | 2854 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,895 psi | 78% | 2851 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 34,577 psi | 52% | 2513 fps | 97.8% |
| Norma 204 | <<locked>> | 80% | 50,546 psi | 76% | 2864 fps | 99.1% |
| Norma 217 | <<locked>> | 88% | 32,155 psi | 48% | 2566 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 42,409 psi | 64% | 2776 fps | 98.8% |
| Norma URP | <<locked>> | 80% | 51,605 psi | 77% | 2867 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,971 psi | 57% | 2680 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 50,575 psi | 76% | 2867 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,084 psi | 51% | 2556 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,819 psi | 43% | 1749 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,287 psi | 80% | 2907 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,779 psi | 78% | 2930 fps | 100% |
| ReloadSwiss RS 76 | 71.7 gr | 80% | 31,966 psi | 48% | 2569 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 42,337 psi | 63% | 2799 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 45,223 psi | 68% | 2743 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 80% | 43,598 psi | 65% | 2746 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 80% | 54,534 psi | 82% | 2884 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,476 psi | 80% | 2854 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,895 psi | 78% | 2851 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,431 psi | 79% | 2805 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,294 psi | 65% | 2743 fps | 98% |
| Somchem S361 | <<locked>> | 80% | 46,180 psi | 69% | 2730 fps | 97% |
| Somchem S365 | <<locked>> | 80% | 49,226 psi | 74% | 2822 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,063 psi | 66% | 2726 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 80% | 52,997 psi | 79% | 2861 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,406 psi | 58% | 2598 fps | 97.2% |
| Vihtavuori N550 | <<locked>> | 80% | 52,431 psi | 79% | 2864 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,250 psi | 65% | 2736 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,250 psi | 63% | 2766 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 84% | 40,118 psi | 60% | 2700 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 90% | 43,497 psi | 65% | 2812 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 96% | 51,169 psi | 77% | 2995 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,460 psi | 79% | 2808 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,607 psi | 82% | 2940 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,201 psi | 54% | 2700 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,480 psi | 61% | 2651 fps | 97.2% |
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 71 powders for 7 mm STW loaded with the .284 | 150gr | Sierra GameKing. Vihtavuori N570 delivers the highest muzzle velocity at 3,136 fps; across all powders the maximum-charge window runs from 1,909 fps to 3,136 fps. ADI AR 2217 gives the best case fill at 100 %, and 71 of the 71 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 150.0 gr projectile in 0.284" calls for a 1:12.0 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, IMR 7828 SSC rank at the top here: for 7 mm STW with the .284 | 150gr | Sierra GameKing 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.