Load Specifications
Load data in caliber 7 mm STW with .284 | 145gr | Speer Boat-Tail 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 59,219 psi | 89% | 2995 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 59,828 psi | 90% | 3025 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 58,218 psi | 87% | 3100 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 88% | 56,942 psi | 85% | 3035 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 59,103 psi | 89% | 3104 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,246 psi | 86% | 3064 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,793 psi | 78% | 3022 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,971 psi | 85% | 3028 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 60,104 psi | 90% | 3074 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 59,364 psi | 89% | 3094 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,884 psi | 85% | 3002 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,869 psi | 85% | 3068 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,856 psi | 87% | 3091 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,868 psi | 82% | 3077 fps | 96.6% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 59,886 psi | 90% | 3054 fps | 97.7% |
| Bofors RP15 | <<locked>> | 94% | 58,276 psi | 87% | 3077 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 56,927 psi | 85% | 3074 fps | 99.5% |
| Bofors RP5 | <<locked>> | 92% | 59,364 psi | 89% | 3094 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 57,319 psi | 86% | 2969 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 59,132 psi | 89% | 3091 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 57,246 psi | 86% | 3022 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 59,567 psi | 89% | 3038 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 58,465 psi | 88% | 3035 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,290 psi | 86% | 3015 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,029 psi | 85% | 2946 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 59,901 psi | 90% | 3209 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 58,334 psi | 87% | 3058 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,318 psi | 56% | 1936 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 59,422 psi | 89% | 3012 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 58,552 psi | 88% | 2989 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 59,959 psi | 90% | 3012 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 58,726 psi | 88% | 3012 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 92% | 57,203 psi | 86% | 3077 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,224 psi | 71% | 2927 fps | 98% |
| Lovex S065 | <<locked>> | 84% | 59,640 psi | 89% | 2989 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,870 psi | 87% | 2986 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,913 psi | 85% | 2963 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,985 psi | 85% | 3012 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 47,979 psi | 72% | 2953 fps | 99.6% |
| Norma MRP | <<locked>> | 90% | 59,422 psi | 89% | 3114 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,725 psi | 87% | 3005 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 58,349 psi | 87% | 3100 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 56,811 psi | 85% | 3009 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,956 psi | 85% | 3031 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,319 psi | 57% | 1982 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 60,147 psi | 90% | 3048 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 58,682 psi | 88% | 3074 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,971 psi | 85% | 3140 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,333 psi | 84% | 3094 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 88% | 57,566 psi | 86% | 2999 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 90% | 60,017 psi | 90% | 3068 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 57,319 psi | 86% | 2969 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 59,640 psi | 89% | 2989 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,870 psi | 87% | 2986 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 58,842 psi | 88% | 2943 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 59,596 psi | 89% | 3064 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 59,451 psi | 89% | 2989 fps | 99.1% |
| Somchem S365 | <<locked>> | 86% | 59,088 psi | 89% | 3005 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,594 psi | 85% | 2979 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 59,727 psi | 90% | 2927 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 59,451 psi | 89% | 2995 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 60,205 psi | 90% | 3018 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 58,653 psi | 88% | 2999 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 59,117 psi | 89% | 3035 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 58,900 psi | 88% | 3110 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 96% | 59,654 psi | 89% | 3097 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 56,971 psi | 85% | 3097 fps | 98.3% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 58,073 psi | 87% | 3156 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 59,306 psi | 89% | 2943 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,479 psi | 86% | 3025 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,275 psi | 84% | 3084 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,565 psi | 85% | 2976 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% | 39,465 psi | 59% | 2657 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 52,286 psi | 78% | 2917 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 43,743 psi | 66% | 2831 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 43,381 psi | 65% | 2789 fps | 97.6% |
| ADI AR 2213 | <<locked>> | 82% | 41,626 psi | 62% | 2779 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 90% | 40,509 psi | 61% | 2746 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 86% | 32,213 psi | 48% | 2582 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,806 psi | 75% | 2917 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,439 psi | 65% | 2785 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,363 psi | 59% | 2726 fps | 96.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,029 psi | 57% | 2680 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,866 psi | 49% | 2595 fps | 97.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,699 psi | 64% | 2838 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 50,807 psi | 76% | 3005 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 49,472 psi | 74% | 2874 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 36,535 psi | 55% | 2657 fps | 95.4% |
| Bofors RP30 | <<locked>> | 86% | 37,521 psi | 56% | 2700 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 39,363 psi | 59% | 2726 fps | 96.6% |
| Bofors RP7 | <<locked>> | 80% | 53,679 psi | 80% | 2913 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 38,609 psi | 58% | 2707 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 53,563 psi | 80% | 2963 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 55,796 psi | 84% | 2979 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 41,321 psi | 62% | 2723 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 82% | 43,569 psi | 65% | 2769 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,978 psi | 70% | 2795 fps | 100% |
| Hodgdon Retumbo | 69.1 gr | 82% | 34,330 psi | 51% | 2677 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 54,273 psi | 81% | 2995 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,036 psi | 42% | 1736 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,095 psi | 74% | 2844 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 55,114 psi | 83% | 2936 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,284 psi | 74% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,714 psi | 64% | 2723 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 82% | 40,132 psi | 60% | 2756 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 94% | 38,363 psi | 57% | 2736 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 52,649 psi | 79% | 2884 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,024 psi | 76% | 2877 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 33,866 psi | 51% | 2530 fps | 97.2% |
| Norma 204 | <<locked>> | 80% | 49,617 psi | 74% | 2887 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 33,605 psi | 50% | 2638 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 41,611 psi | 62% | 2799 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 50,662 psi | 76% | 2894 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 40,045 psi | 60% | 2762 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 49,617 psi | 74% | 2894 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 33,402 psi | 50% | 2575 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,660 psi | 43% | 1778 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,431 psi | 79% | 2933 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,647 psi | 76% | 2953 fps | 100% |
| ReloadSwiss RS 76 | 74 gr | 82% | 33,692 psi | 51% | 2654 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 44,730 psi | 67% | 2881 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 44,425 psi | 67% | 2766 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 80% | 42,946 psi | 64% | 2772 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 80% | 53,679 psi | 80% | 2913 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,649 psi | 79% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,024 psi | 76% | 2877 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,561 psi | 77% | 2831 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,598 psi | 64% | 2766 fps | 97.6% |
| Somchem S361 | <<locked>> | 80% | 45,324 psi | 68% | 2753 fps | 96.4% |
| Somchem S365 | <<locked>> | 80% | 48,211 psi | 72% | 2848 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,395 psi | 65% | 2749 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 80% | 55,912 psi | 84% | 2874 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 52,243 psi | 78% | 2890 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,797 psi | 57% | 2621 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 80% | 51,503 psi | 77% | 2890 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,351 psi | 63% | 2759 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,495 psi | 62% | 2789 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 86% | 42,134 psi | 63% | 2782 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 92% | 45,759 psi | 69% | 2894 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 98% | 53,809 psi | 81% | 3084 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,648 psi | 77% | 2841 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,795 psi | 81% | 2966 fps | 99.9% |
| Winchester StaBALL HD | 69.2 gr | 80% | 35,099 psi | 53% | 2713 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,842 psi | 60% | 2674 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 78 powders for 7 mm STW loaded with the .284 | 145gr | Speer Boat-Tail. Hodgdon Retumbo delivers the highest muzzle velocity at 3,209 fps; across all powders the maximum-charge window runs from 1,936 fps to 3,209 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 145.0 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 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 | 145gr | Speer Boat-Tail 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.