Load Specifications
Load data in caliber 7 mm STW with .284 | 145gr | Speer Grand Slam 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% | 59,393 psi | 89% | 2995 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 60,002 psi | 90% | 3025 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 58,363 psi | 87% | 3100 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 88% | 57,130 psi | 86% | 3035 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 59,277 psi | 89% | 3104 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,377 psi | 86% | 3064 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,924 psi | 78% | 3022 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,174 psi | 86% | 3028 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 60,278 psi | 90% | 3074 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 59,524 psi | 89% | 3094 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,058 psi | 86% | 3002 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,043 psi | 86% | 3068 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 58,030 psi | 87% | 3094 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,216 psi | 83% | 3081 fps | 96.6% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 59,973 psi | 90% | 3051 fps | 97.7% |
| Bofors RP15 | <<locked>> | 94% | 58,436 psi | 88% | 3077 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 57,072 psi | 86% | 3077 fps | 99.5% |
| Bofors RP5 | <<locked>> | 92% | 59,524 psi | 89% | 3094 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 57,276 psi | 86% | 2969 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 59,277 psi | 89% | 3091 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 57,450 psi | 86% | 3025 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 59,712 psi | 90% | 3038 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 58,624 psi | 88% | 3035 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,450 psi | 86% | 3018 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,232 psi | 86% | 2946 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 60,089 psi | 90% | 3212 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 58,523 psi | 88% | 3061 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,376 psi | 56% | 1936 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 59,596 psi | 89% | 3012 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 58,726 psi | 88% | 2989 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% | 57,377 psi | 86% | 3081 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,355 psi | 71% | 2927 fps | 98% |
| Lovex S065 | <<locked>> | 84% | 59,843 psi | 90% | 2989 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 58,059 psi | 87% | 2989 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,087 psi | 86% | 2966 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,174 psi | 86% | 3012 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 48,124 psi | 72% | 2956 fps | 99.6% |
| Norma MRP | <<locked>> | 90% | 59,596 psi | 89% | 3114 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,928 psi | 87% | 3005 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 58,537 psi | 88% | 3104 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 57,000 psi | 85% | 3012 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,130 psi | 86% | 3031 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,363 psi | 57% | 1985 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 60,350 psi | 90% | 3048 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 58,871 psi | 88% | 3077 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,101 psi | 86% | 3140 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,478 psi | 85% | 3094 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 88% | 57,740 psi | 87% | 3002 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 90% | 60,205 psi | 90% | 3071 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 57,276 psi | 86% | 2969 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 59,843 psi | 90% | 2989 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 58,059 psi | 87% | 2989 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 59,030 psi | 88% | 2943 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 59,770 psi | 90% | 3064 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 59,582 psi | 89% | 2992 fps | 99.1% |
| Somchem S365 | <<locked>> | 86% | 59,306 psi | 89% | 3009 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,768 psi | 85% | 2982 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 59,901 psi | 90% | 2927 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 59,640 psi | 89% | 2995 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 60,365 psi | 90% | 3018 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 58,813 psi | 88% | 2999 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 59,306 psi | 89% | 3035 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 59,059 psi | 89% | 3114 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 96% | 59,785 psi | 90% | 3097 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 57,159 psi | 86% | 3097 fps | 98.3% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 58,233 psi | 87% | 3156 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 59,466 psi | 89% | 2946 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,653 psi | 86% | 3028 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,463 psi | 85% | 3087 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,724 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% | 39,494 psi | 59% | 2657 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 52,257 psi | 78% | 2913 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 43,918 psi | 66% | 2835 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 43,526 psi | 65% | 2792 fps | 97.7% |
| ADI AR 2213 | <<locked>> | 82% | 41,785 psi | 63% | 2782 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 88% | 38,072 psi | 57% | 2690 fps | 95% |
| ADI AR 2225 | <<locked>> | 86% | 32,343 psi | 48% | 2585 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,009 psi | 75% | 2920 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,424 psi | 65% | 2782 fps | 97.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,508 psi | 59% | 2726 fps | 96.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,189 psi | 57% | 2684 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,996 psi | 49% | 2598 fps | 97.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,844 psi | 64% | 2838 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 50,966 psi | 76% | 3009 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 49,588 psi | 74% | 2874 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 36,695 psi | 55% | 2661 fps | 95.4% |
| Bofors RP30 | <<locked>> | 86% | 37,666 psi | 56% | 2703 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 39,508 psi | 59% | 2726 fps | 96.6% |
| Bofors RP7 | <<locked>> | 80% | 53,882 psi | 81% | 2913 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 38,754 psi | 58% | 2710 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 53,766 psi | 81% | 2966 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 55,956 psi | 84% | 2979 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 41,481 psi | 62% | 2723 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 82% | 43,729 psi | 66% | 2769 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,978 psi | 70% | 2792 fps | 100% |
| Hodgdon Retumbo | 69.3 gr | 82% | 34,490 psi | 52% | 2680 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 54,215 psi | 81% | 2995 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,108 psi | 42% | 1739 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,284 psi | 74% | 2848 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 55,085 psi | 83% | 2936 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 49,443 psi | 74% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,888 psi | 64% | 2726 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 82% | 40,277 psi | 60% | 2756 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 94% | 38,508 psi | 58% | 2740 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 52,808 psi | 79% | 2884 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,198 psi | 77% | 2877 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 34,011 psi | 51% | 2533 fps | 97.3% |
| Norma 204 | <<locked>> | 80% | 49,763 psi | 75% | 2890 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 33,750 psi | 51% | 2641 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 41,800 psi | 63% | 2799 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 50,850 psi | 76% | 2897 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 40,205 psi | 60% | 2766 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 49,763 psi | 75% | 2894 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 33,547 psi | 50% | 2575 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,732 psi | 43% | 1778 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,620 psi | 79% | 2936 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,821 psi | 76% | 2953 fps | 100% |
| ReloadSwiss RS 76 | 74.2 gr | 82% | 33,823 psi | 51% | 2654 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 44,860 psi | 67% | 2884 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 44,585 psi | 67% | 2766 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 80% | 42,931 psi | 64% | 2769 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 80% | 53,882 psi | 81% | 2913 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,808 psi | 79% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,198 psi | 77% | 2877 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,721 psi | 78% | 2835 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,583 psi | 64% | 2766 fps | 97.6% |
| Somchem S361 | <<locked>> | 80% | 45,484 psi | 68% | 2753 fps | 96.5% |
| Somchem S365 | <<locked>> | 80% | 48,443 psi | 73% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,555 psi | 65% | 2749 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 80% | 56,115 psi | 84% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 52,214 psi | 78% | 2887 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,782 psi | 57% | 2618 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 80% | 51,677 psi | 77% | 2894 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,511 psi | 64% | 2762 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,669 psi | 62% | 2789 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 86% | 42,293 psi | 63% | 2782 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 92% | 45,934 psi | 69% | 2897 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 98% | 54,012 psi | 81% | 3084 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,822 psi | 78% | 2841 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,969 psi | 81% | 2969 fps | 99.9% |
| Winchester StaBALL HD | 69.4 gr | 80% | 35,273 psi | 53% | 2717 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,972 psi | 60% | 2674 fps | 96.8% |
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 Grand Slam. Hodgdon Retumbo delivers the highest muzzle velocity at 3,212 fps; across all powders the maximum-charge window runs from 1,936 fps to 3,212 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 1:13.0 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 Grand Slam 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.