Load Specifications
Load data in caliber 7 mm STW with .284 | 140gr | Barnes MRX BT bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Winchester StaBALL HD 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>> | 94% | 59,538 psi | 89% | 3045 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,304 psi | 84% | 3025 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 58,813 psi | 88% | 3150 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 82% | 60,234 psi | 90% | 3038 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 57,711 psi | 87% | 3087 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 59,901 psi | 90% | 3156 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,867 psi | 81% | 3048 fps | 98.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,182 psi | 72% | 3002 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,624 psi | 86% | 3087 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,943 psi | 88% | 3097 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,174 psi | 86% | 3074 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 59,901 psi | 90% | 3146 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,217 psi | 86% | 3054 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,203 psi | 86% | 3117 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 58,233 psi | 87% | 3143 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,000 psi | 85% | 3045 fps | 96.7% |
| Bofors RP15 | <<locked>> | 96% | 58,755 psi | 88% | 3130 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,884 psi | 85% | 3117 fps | 99.3% |
| Bofors RP5 | <<locked>> | 94% | 59,901 psi | 90% | 3146 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 58,175 psi | 87% | 3025 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 59,698 psi | 89% | 3143 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 84% | 58,088 psi | 87% | 3081 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,782 psi | 85% | 3038 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 59,321 psi | 89% | 3087 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 58,102 psi | 87% | 3071 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,667 psi | 86% | 3002 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 60,031 psi | 90% | 3258 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 59,437 psi | 89% | 3120 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,130 psi | 56% | 1962 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 60,336 psi | 90% | 3068 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 59,828 psi | 90% | 3054 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 56,782 psi | 85% | 3015 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 59,698 psi | 89% | 3068 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 94% | 57,537 psi | 86% | 3130 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,642 psi | 65% | 2894 fps | 96.6% |
| Lovex S065 | <<locked>> | 84% | 56,826 psi | 85% | 2992 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,769 psi | 88% | 3041 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,884 psi | 85% | 3009 fps | 100% |
| Norma 204 | <<locked>> | 86% | 58,015 psi | 87% | 3071 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 43,903 psi | 66% | 2920 fps | 98.7% |
| Norma MRP | <<locked>> | 92% | 60,075 psi | 90% | 3166 fps | 100% |
| Norma URP | <<locked>> | 86% | 58,566 psi | 88% | 3061 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 58,827 psi | 88% | 3153 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 57,609 psi | 86% | 3068 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,406 psi | 86% | 3081 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,869 psi | 57% | 2005 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,608 psi | 85% | 3045 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 59,495 psi | 89% | 3136 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,188 psi | 86% | 3189 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,449 psi | 85% | 3136 fps | 98.4% |
| Rottweil R 903 | <<locked>> | 82% | 59,727 psi | 90% | 3022 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 58,465 psi | 88% | 3054 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 56,623 psi | 85% | 3061 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 58,175 psi | 87% | 3025 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,826 psi | 85% | 2992 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,769 psi | 88% | 3041 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,929 psi | 88% | 2887 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 59,785 psi | 90% | 2999 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 60,263 psi | 90% | 3117 fps | 99.8% |
| Somchem S355 | <<locked>> | 82% | 59,277 psi | 89% | 3015 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 56,449 psi | 85% | 2982 fps | 98.4% |
| Somchem S365 | <<locked>> | 88% | 59,538 psi | 89% | 3061 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,072 psi | 86% | 3031 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 56,869 psi | 85% | 2933 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,507 psi | 85% | 2999 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,898 psi | 85% | 3012 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 59,495 psi | 89% | 3054 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 59,074 psi | 89% | 3081 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 59,698 psi | 89% | 3166 fps | 99% |
| Vihtavuori N565 | <<locked>> | 98% | 59,698 psi | 89% | 3140 fps | 99.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,217 psi | 86% | 3143 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,260 psi | 84% | 2949 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 58,320 psi | 87% | 3084 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,028 psi | 84% | 3133 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,290 psi | 86% | 3028 fps | 99.6% |
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% | 36,477 psi | 55% | 2631 fps | 97.7% |
| Accurate 4350 | <<locked>> | 80% | 48,979 psi | 73% | 2907 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 47,239 psi | 71% | 2946 fps | 96% |
| ADI AR 2208 | <<locked>> | 80% | 56,579 psi | 85% | 2986 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 40,756 psi | 61% | 2776 fps | 96.4% |
| ADI AR 2213 | <<locked>> | 84% | 41,989 psi | 63% | 2828 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 92% | 40,611 psi | 61% | 2785 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 90% | 34,171 psi | 51% | 2674 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,891 psi | 70% | 2913 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,694 psi | 82% | 3035 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,843 psi | 61% | 2769 fps | 96.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,637 psi | 55% | 2700 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,201 psi | 53% | 2661 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,429 psi | 46% | 2562 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,392 psi | 59% | 2812 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,548 psi | 80% | 2986 fps | 95.9% |
| Bofors RP15 | <<locked>> | 84% | 39,030 psi | 59% | 2756 fps | 95.8% |
| Bofors RP30 | <<locked>> | 90% | 39,914 psi | 60% | 2795 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 36,637 psi | 55% | 2700 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 51,039 psi | 77% | 2910 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 38,653 psi | 58% | 2746 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 50,676 psi | 76% | 2959 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 53,127 psi | 80% | 2976 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 84% | 44,759 psi | 67% | 2835 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 44,034 psi | 66% | 2818 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,135 psi | 66% | 2789 fps | 100% |
| Hodgdon Retumbo | 71.8 gr | 86% | 36,579 psi | 55% | 2779 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 51,039 psi | 77% | 2986 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,760 psi | 42% | 1759 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,572 psi | 70% | 2841 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,663 psi | 79% | 2940 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 46,340 psi | 69% | 2844 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 43,265 psi | 65% | 2772 fps | 95.5% |
| IMR 7828 SSC | 70.1 gr | 84% | 40,350 psi | 60% | 2802 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,669 psi | 61% | 2828 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 49,922 psi | 75% | 2881 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 48,269 psi | 72% | 2871 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 31,198 psi | 47% | 2500 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 46,905 psi | 70% | 2877 fps | 97.9% |
| Norma 217 | <<locked>> | 94% | 35,331 psi | 53% | 2720 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 38,653 psi | 58% | 2772 fps | 97.3% |
| Norma URP | <<locked>> | 80% | 47,776 psi | 72% | 2890 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 40,118 psi | 60% | 2805 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 46,804 psi | 70% | 2887 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 35,926 psi | 54% | 2674 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,326 psi | 42% | 1798 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,066 psi | 74% | 2927 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,572 psi | 71% | 2946 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 33,417 psi | 50% | 2680 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,367 psi | 67% | 2917 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 55,796 psi | 84% | 2966 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 41,959 psi | 63% | 2753 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 80% | 40,176 psi | 60% | 2753 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 80% | 51,039 psi | 77% | 2910 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,922 psi | 75% | 2881 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 48,269 psi | 72% | 2871 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 55,506 psi | 83% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,936 psi | 73% | 2828 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,842 psi | 60% | 2749 fps | 96.3% |
| Somchem S355 | <<locked>> | 80% | 55,419 psi | 83% | 2963 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 42,844 psi | 64% | 2740 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 45,063 psi | 68% | 2844 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,611 psi | 61% | 2733 fps | 97.4% |
| Vihtavuori N150 | <<locked>> | 80% | 53,113 psi | 80% | 2881 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,414 psi | 74% | 2890 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,259 psi | 53% | 2598 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 48,675 psi | 73% | 2887 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,436 psi | 59% | 2746 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 44,686 psi | 67% | 2897 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 88% | 42,003 psi | 63% | 2818 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 94% | 45,571 psi | 68% | 2930 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,747 psi | 73% | 2841 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,894 psi | 76% | 2963 fps | 99.6% |
| Winchester StaBALL HD | 68.6 gr | 80% | 31,749 psi | 48% | 2677 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,260 psi | 56% | 2654 fps | 95.3% |
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 80 powders for 7 mm STW loaded with the .284 | 140gr | Barnes MRX BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,258 fps; across all powders the maximum-charge window runs from 1,962 fps to 3,258 fps. ADI AR 2217 gives the best case fill at 100 %, and 80 of the 80 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 1:11.5 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, Winchester StaBALL HD, IMR 7828 SSC rank at the top here: for 7 mm STW with the .284 | 140gr | Barnes MRX BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, 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.