Load Specifications
Load data in caliber 7 mm STW with .284 | 135gr | Atomic 29 HP bullet and 74 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Alliant Reloder-26 and Hodgdon Retumbo.
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% | 59,030 psi | 88% | 3077 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 59,814 psi | 90% | 3114 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,711 psi | 87% | 3173 fps | 98% |
| ADI AR 2208 | <<locked>> | 82% | 59,596 psi | 89% | 3068 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 56,782 psi | 85% | 3114 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 94% | 58,624 psi | 88% | 3179 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,852 psi | 79% | 3068 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,572 psi | 71% | 3025 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,594 psi | 85% | 3114 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,972 psi | 87% | 3127 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 60,046 psi | 90% | 3156 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 58,798 psi | 88% | 3169 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 60,162 psi | 90% | 3136 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 60,104 psi | 90% | 3202 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,014 psi | 85% | 3173 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 59,944 psi | 90% | 3127 fps | 96.9% |
| Bofors RP15 | <<locked>> | 96% | 57,928 psi | 87% | 3156 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,796 psi | 84% | 3143 fps | 99% |
| Bofors RP5 | <<locked>> | 94% | 58,798 psi | 88% | 3169 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 57,740 psi | 87% | 3058 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,450 psi | 88% | 3159 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 84% | 57,290 psi | 86% | 3107 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 59,799 psi | 90% | 3127 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 58,465 psi | 88% | 3114 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,261 psi | 86% | 3094 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,087 psi | 86% | 3035 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,885 psi | 88% | 3284 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 58,508 psi | 88% | 3146 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,202 psi | 56% | 1991 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 59,524 psi | 89% | 3094 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 59,016 psi | 88% | 3081 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 60,046 psi | 90% | 3104 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,914 psi | 88% | 3091 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 56,521 psi | 85% | 3153 fps | 98.7% |
| Lovex S065 | <<locked>> | 86% | 59,799 psi | 90% | 3074 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,146 psi | 87% | 3074 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 59,959 psi | 90% | 3091 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,188 psi | 86% | 3097 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 43,294 psi | 65% | 2946 fps | 98.3% |
| Norma MRP | <<locked>> | 92% | 58,914 psi | 88% | 3192 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,754 psi | 87% | 3091 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,667 psi | 86% | 3176 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 56,840 psi | 85% | 3097 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,231 psi | 84% | 3100 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,971 psi | 57% | 2037 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 60,046 psi | 90% | 3133 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 58,479 psi | 88% | 3163 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,956 psi | 84% | 3209 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,288 psi | 83% | 3156 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 82% | 59,335 psi | 89% | 3058 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 57,653 psi | 86% | 3081 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 92% | 59,828 psi | 90% | 3150 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 84% | 57,740 psi | 87% | 3058 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 59,799 psi | 90% | 3074 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,146 psi | 87% | 3074 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,407 psi | 88% | 2920 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 59,146 psi | 89% | 3028 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 59,393 psi | 89% | 3146 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 58,610 psi | 88% | 3051 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 59,582 psi | 89% | 3068 fps | 98.5% |
| Somchem S365 | <<locked>> | 88% | 58,653 psi | 88% | 3094 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 60,336 psi | 90% | 3117 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 60,133 psi | 90% | 3018 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 59,611 psi | 89% | 3084 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 59,901 psi | 90% | 3094 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 58,784 psi | 88% | 3087 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 58,334 psi | 87% | 3114 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 58,494 psi | 88% | 3186 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 98% | 58,914 psi | 88% | 3166 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,101 psi | 84% | 3163 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 59,524 psi | 89% | 3035 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,508 psi | 86% | 3114 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 59,263 psi | 89% | 3225 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,492 psi | 85% | 3054 fps | 99.3% |
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% | 36,390 psi | 55% | 2664 fps | 97.3% |
| Accurate 4350 | <<locked>> | 80% | 48,501 psi | 73% | 2940 fps | 100% |
| Accurate MAGPRO | 75.4 gr | 86% | 46,615 psi | 70% | 2969 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 56,014 psi | 84% | 3018 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 40,379 psi | 61% | 2802 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 86% | 44,498 psi | 67% | 2917 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 94% | 42,960 psi | 64% | 2871 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 90% | 33,982 psi | 51% | 2697 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,311 psi | 69% | 2946 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,012 psi | 81% | 3068 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,364 psi | 61% | 2792 fps | 95.9% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,928 psi | 58% | 2792 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,954 psi | 52% | 2694 fps | 99.6% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,371 psi | 46% | 2589 fps | 95.4% |
| Alliant Reloder-26 | 70.9 gr | 80% | 38,885 psi | 58% | 2841 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,968 psi | 79% | 3009 fps | 95.2% |
| Bofors RP15 | <<locked>> | 84% | 38,754 psi | 58% | 2785 fps | 95.2% |
| Bofors RP30 | <<locked>> | 92% | 42,264 psi | 63% | 2884 fps | 95.9% |
| Bofors RP5 | <<locked>> | 82% | 38,928 psi | 58% | 2792 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 50,676 psi | 76% | 2940 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 41,104 psi | 62% | 2835 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 50,227 psi | 75% | 2992 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 52,562 psi | 79% | 3005 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 84% | 44,179 psi | 66% | 2858 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 46,630 psi | 70% | 2907 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,743 psi | 66% | 2822 fps | 100% |
| Hodgdon Retumbo | 71.3 gr | 86% | 36,376 psi | 55% | 2805 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 50,256 psi | 75% | 3012 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,789 psi | 42% | 1785 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,195 psi | 69% | 2867 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,170 psi | 78% | 2969 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 46,021 psi | 69% | 2881 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,745 psi | 69% | 2858 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 86% | 42,786 psi | 64% | 2890 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 49,661 psi | 74% | 2913 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 48,008 psi | 72% | 2904 fps | 99.2% |
| Lovex S071 | <<locked>> | 80% | 31,357 psi | 47% | 2536 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 46,499 psi | 70% | 2907 fps | 97.5% |
| Norma 217 | <<locked>> | 94% | 35,056 psi | 53% | 2749 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 38,174 psi | 57% | 2799 fps | 96.7% |
| Norma URP | <<locked>> | 80% | 47,384 psi | 71% | 2923 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 42,830 psi | 64% | 2900 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 46,398 psi | 70% | 2917 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 84% | 35,621 psi | 53% | 2700 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,369 psi | 43% | 1827 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,689 psi | 73% | 2959 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,804 psi | 70% | 2972 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 35,781 psi | 54% | 2779 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 47,166 psi | 71% | 3009 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 55,419 psi | 83% | 3002 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 41,626 psi | 62% | 2779 fps | 95% |
| Rottweil R 905 | <<locked>> | 80% | 39,726 psi | 60% | 2779 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 50,676 psi | 76% | 2940 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,661 psi | 74% | 2913 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 48,008 psi | 72% | 2904 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 55,013 psi | 82% | 2877 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,718 psi | 73% | 2861 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,392 psi | 59% | 2772 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 55,027 psi | 82% | 2999 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 45,556 psi | 68% | 2825 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 44,672 psi | 67% | 2877 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,480 psi | 61% | 2762 fps | 97% |
| Vihtavuori N150 | <<locked>> | 80% | 52,750 psi | 79% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,776 psi | 73% | 2917 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 37,507 psi | 56% | 2684 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 48,327 psi | 72% | 2920 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,291 psi | 59% | 2779 fps | 99.5% |
| Vihtavuori N560 | <<locked>> | 84% | 44,063 psi | 66% | 2920 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 90% | 44,628 psi | 67% | 2907 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 96% | 48,312 psi | 72% | 3022 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,312 psi | 72% | 2871 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,227 psi | 75% | 2992 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 31,328 psi | 47% | 2710 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,639 psi | 59% | 2743 fps | 95.7% |
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 79 powders for 7 mm STW loaded with the .284 | 135gr | Atomic 29 HP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,284 fps; across all powders the maximum-charge window runs from 1,991 fps to 3,284 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 135.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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. Accurate MAGPRO, Alliant Reloder-26, Hodgdon Retumbo rank at the top here: for 7 mm STW with the .284 | 135gr | Atomic 29 HP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 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.