Load Specifications
Load data in caliber 7 mm STW with .284 | 151gr | Warner Tool Co. Flat Line bullet and 74 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 56,579 psi | 85% | 2907 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,348 psi | 86% | 2936 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 59,524 psi | 89% | 3068 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 90% | 58,407 psi | 88% | 2999 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 56,304 psi | 84% | 3005 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,317 psi | 81% | 2966 fps | 99.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,921 psi | 73% | 2927 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 58,479 psi | 88% | 2992 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 59,625 psi | 89% | 2999 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,928 psi | 87% | 2986 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,550 psi | 85% | 2999 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 58,073 psi | 87% | 2966 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,783 psi | 87% | 3031 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 59,176 psi | 89% | 3061 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,522 psi | 86% | 2959 fps | 97.2% |
| Bofors RP15 | <<locked>> | 96% | 59,408 psi | 89% | 3038 fps | 99.9% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,595 psi | 86% | 3038 fps | 99.6% |
| Bofors RP5 | <<locked>> | 92% | 56,550 psi | 85% | 2999 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 58,972 psi | 88% | 2936 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 60,336 psi | 90% | 3054 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 84% | 59,045 psi | 89% | 2992 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,522 psi | 86% | 2949 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 92% | 59,930 psi | 90% | 2999 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 58,711 psi | 88% | 2982 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 58,508 psi | 88% | 2910 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,768 psi | 85% | 3110 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 60,075 psi | 90% | 3031 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,391 psi | 56% | 1880 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,246 psi | 86% | 2920 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,739 psi | 85% | 2904 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,740 psi | 87% | 2927 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 60,278 psi | 90% | 2976 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 94% | 58,276 psi | 87% | 3041 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,483 psi | 67% | 2828 fps | 97.4% |
| Lovex S065 | <<locked>> | 84% | 57,667 psi | 86% | 2904 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 59,698 psi | 89% | 2953 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 58,059 psi | 87% | 2927 fps | 100% |
| Norma 204 | <<locked>> | 86% | 58,653 psi | 88% | 2979 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 44,831 psi | 67% | 2858 fps | 99.3% |
| Norma MRP | <<locked>> | 90% | 56,565 psi | 85% | 3018 fps | 100% |
| Norma URP | <<locked>> | 86% | 59,451 psi | 89% | 2969 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 59,669 psi | 89% | 3068 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 86% | 58,320 psi | 87% | 2976 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,928 psi | 87% | 2992 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,247 psi | 57% | 1923 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,609 psi | 86% | 2959 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 60,205 psi | 90% | 3045 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,870 psi | 87% | 3104 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 57,305 psi | 86% | 3061 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 90% | 59,306 psi | 89% | 2969 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 90% | 57,421 psi | 86% | 2972 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 58,972 psi | 88% | 2936 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,667 psi | 86% | 2904 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 59,698 psi | 89% | 2953 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 59,828 psi | 90% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,840 psi | 85% | 2858 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,985 psi | 85% | 2972 fps | 99.8% |
| Somchem S355 | <<locked>> | 82% | 60,191 psi | 90% | 2923 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 57,159 psi | 86% | 2900 fps | 98.8% |
| Somchem S365 | <<locked>> | 86% | 56,492 psi | 85% | 2920 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,856 psi | 87% | 2943 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,798 psi | 87% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,217 psi | 86% | 2907 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,667 psi | 86% | 2927 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 56,623 psi | 85% | 2913 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 60,176 psi | 90% | 2992 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 60,365 psi | 90% | 3081 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 96% | 56,579 psi | 85% | 2999 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,653 psi | 86% | 3058 fps | 98.4% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 54,505 psi | 82% | 3048 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,029 psi | 85% | 2861 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 59,045 psi | 89% | 2992 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 57,043 psi | 86% | 3051 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 58,030 psi | 87% | 2943 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% | 37,681 psi | 56% | 2575 fps | 98.5% |
| Accurate 4350 | <<locked>> | 80% | 50,082 psi | 75% | 2825 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 44,730 psi | 67% | 2808 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 41,698 psi | 63% | 2707 fps | 97.3% |
| ADI AR 2213 | <<locked>> | 82% | 39,914 psi | 60% | 2694 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 90% | 38,769 psi | 58% | 2661 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 88% | 32,866 psi | 49% | 2562 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,906 psi | 72% | 2831 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 55,651 psi | 83% | 2946 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,655 psi | 62% | 2697 fps | 97.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,579 psi | 56% | 2641 fps | 96.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,187 psi | 54% | 2598 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,459 psi | 47% | 2516 fps | 97.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,335 psi | 60% | 2749 fps | 99.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 50,778 psi | 76% | 2844 fps | 95.6% |
| Bofors RP15 | <<locked>> | 82% | 37,478 psi | 56% | 2635 fps | 95.9% |
| Bofors RP30 | <<locked>> | 88% | 38,145 psi | 57% | 2674 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 37,579 psi | 56% | 2641 fps | 96.1% |
| Bofors RP7 | <<locked>> | 80% | 51,938 psi | 78% | 2825 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 36,970 psi | 55% | 2621 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 51,488 psi | 77% | 2877 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 53,911 psi | 81% | 2890 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 82% | 42,540 psi | 64% | 2697 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 82% | 41,829 psi | 63% | 2684 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,208 psi | 68% | 2713 fps | 100% |
| Hodgdon Retumbo | 66.3 gr | 84% | 35,085 psi | 53% | 2657 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 51,735 psi | 78% | 2904 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,021 psi | 42% | 1683 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,456 psi | 71% | 2762 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,432 psi | 80% | 2851 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 47,456 psi | 71% | 2769 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,292 psi | 62% | 2641 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 84% | 41,133 psi | 62% | 2733 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 96% | 38,740 psi | 58% | 2707 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 50,865 psi | 76% | 2799 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,298 psi | 74% | 2792 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 32,460 psi | 49% | 2454 fps | 96.9% |
| Norma 204 | <<locked>> | 80% | 47,718 psi | 72% | 2799 fps | 98.5% |
| Norma 217 | <<locked>> | 92% | 33,953 psi | 51% | 2612 fps | 96% |
| Norma MRP | <<locked>> | 80% | 39,523 psi | 59% | 2707 fps | 98.1% |
| Norma URP | <<locked>> | 80% | 48,791 psi | 73% | 2812 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 38,159 psi | 57% | 2674 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 47,659 psi | 71% | 2808 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 34,113 psi | 51% | 2552 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,660 psi | 43% | 1722 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,154 psi | 75% | 2844 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,443 psi | 73% | 2867 fps | 100% |
| ReloadSwiss RS 76 | 69.3 gr | 82% | 32,010 psi | 48% | 2562 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 41,800 psi | 63% | 2782 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 42,815 psi | 64% | 2680 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 80% | 41,046 psi | 62% | 2684 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 80% | 51,938 psi | 78% | 2825 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,865 psi | 76% | 2799 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,298 psi | 74% | 2792 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 56,202 psi | 84% | 2746 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,806 psi | 75% | 2746 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,712 psi | 61% | 2680 fps | 97.2% |
| Somchem S355 | <<locked>> | 80% | 56,376 psi | 85% | 2871 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 43,685 psi | 65% | 2667 fps | 96% |
| Somchem S365 | <<locked>> | 80% | 46,209 psi | 69% | 2769 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,684 psi | 62% | 2667 fps | 98.2% |
| Vihtavuori N150 | <<locked>> | 80% | 54,099 psi | 81% | 2792 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,227 psi | 75% | 2802 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,172 psi | 54% | 2539 fps | 96.2% |
| Vihtavuori N550 | <<locked>> | 80% | 49,690 psi | 74% | 2808 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,654 psi | 61% | 2680 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 42,540 psi | 64% | 2762 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 86% | 40,059 psi | 60% | 2694 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 94% | 46,456 psi | 70% | 2867 fps | 96% |
| Vihtavuori N570 | <<locked>> | 98% | 50,778 psi | 76% | 2982 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,588 psi | 74% | 2759 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,735 psi | 78% | 2877 fps | 99.8% |
| Winchester StaBALL HD | 64.8 gr | 80% | 32,822 psi | 49% | 2628 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,087 psi | 57% | 2589 fps | 96.2% |
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 79 powders for 7 mm STW loaded with the .284 | 151gr | Warner Tool Co. Flat Line. Hodgdon Retumbo delivers the highest muzzle velocity at 3,110 fps; across all powders the maximum-charge window runs from 1,880 fps to 3,110 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 151.0 gr projectile in 0.284" calls for a 1:8.5 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, ReloadSwiss RS 76, Winchester StaBALL HD rank at the top here: for 7 mm STW with the .284 | 151gr | Warner Tool Co. Flat Line 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.