Load Specifications
Load data in caliber 7 mm STW with .284 | 170gr | Sierra RN Prohunter bullet and 60 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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>> | 88% | 57,319 psi | 86% | 2776 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 60,220 psi | 90% | 2936 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 86% | 58,363 psi | 87% | 2858 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 57,014 psi | 85% | 2874 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 59,582 psi | 89% | 2904 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,985 psi | 84% | 2959 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 58,407 psi | 88% | 2923 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,711 psi | 88% | 2841 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,943 psi | 87% | 2848 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,464 psi | 86% | 2867 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 59,176 psi | 89% | 2825 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 59,654 psi | 89% | 2900 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 60,278 psi | 90% | 2917 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,725 psi | 87% | 2940 fps | 98.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,345 psi | 80% | 2864 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,276 psi | 86% | 2831 fps | 98.5% |
| Bofors RP15 | <<locked>> | 92% | 60,336 psi | 90% | 2910 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 59,524 psi | 89% | 2920 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 57,464 psi | 86% | 2867 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 57,232 psi | 86% | 2871 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 59,799 psi | 90% | 2864 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 58,827 psi | 88% | 2851 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,682 psi | 88% | 2762 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 58,798 psi | 88% | 2986 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,666 psi | 56% | 1798 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,985 psi | 85% | 2779 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,725 psi | 87% | 2779 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 60,002 psi | 90% | 2841 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 90% | 59,176 psi | 89% | 2913 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,621 psi | 80% | 2851 fps | 99.8% |
| Lovex S070 | <<locked>> | 82% | 59,161 psi | 89% | 2805 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 58,958 psi | 88% | 2795 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,204 psi | 87% | 2835 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,694 psi | 82% | 2871 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,537 psi | 86% | 2884 fps | 100% |
| Norma URP | <<locked>> | 82% | 59,263 psi | 89% | 2822 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,594 psi | 85% | 2877 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 58,218 psi | 87% | 2828 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 59,321 psi | 89% | 2867 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,740 psi | 58% | 1841 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 60,104 psi | 90% | 2979 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 59,364 psi | 89% | 2949 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 86% | 58,842 psi | 88% | 2825 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 57,827 psi | 87% | 2841 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 59,161 psi | 89% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 59,611 psi | 89% | 2759 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,435 psi | 86% | 2835 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,652 psi | 85% | 2766 fps | 99.6% |
| Somchem S365 | <<locked>> | 82% | 57,232 psi | 86% | 2776 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 58,117 psi | 87% | 2808 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,986 psi | 87% | 2795 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,261 psi | 86% | 2818 fps | 97% |
| Vihtavuori N550 | <<locked>> | 82% | 60,031 psi | 90% | 2815 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 57,290 psi | 86% | 2802 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,913 psi | 85% | 2884 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 92% | 57,812 psi | 87% | 2877 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 96% | 59,582 psi | 89% | 2946 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 96% | 56,782 psi | 85% | 2946 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 90% | 59,712 psi | 90% | 2917 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,943 psi | 87% | 2805 fps | 100% |
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% | 43,859 psi | 66% | 2566 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 45,426 psi | 68% | 2690 fps | 97.5% |
| ADI AR 2209 | <<locked>> | 80% | 47,790 psi | 72% | 2690 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 43,076 psi | 65% | 2635 fps | 98% |
| ADI AR 2217 | <<locked>> | 82% | 34,374 psi | 52% | 2441 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 94% | 44,991 psi | 67% | 2749 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 29,428 psi | 44% | 2349 fps | 96.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,998 psi | 82% | 2792 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,747 psi | 72% | 2684 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,845 psi | 66% | 2641 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,525 psi | 64% | 2579 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,840 psi | 55% | 2523 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,298 psi | 72% | 2743 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 46,151 psi | 69% | 2743 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 96% | 45,803 psi | 69% | 2730 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,353 psi | 66% | 2608 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 40,872 psi | 61% | 2582 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 34,432 psi | 52% | 2457 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 43,845 psi | 66% | 2641 fps | 99% |
| Hodgdon H1000 | <<locked>> | 80% | 34,853 psi | 52% | 2457 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 80% | 45,585 psi | 68% | 2635 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,831 psi | 67% | 2618 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,547 psi | 77% | 2667 fps | 100% |
| Hodgdon Retumbo | 66.2 gr | 80% | 35,969 psi | 54% | 2562 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,340 psi | 42% | 1611 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,359 psi | 80% | 2726 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 54,215 psi | 81% | 2730 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,543 psi | 70% | 2625 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 80% | 41,887 psi | 63% | 2618 fps | 97.7% |
| IMR 8133 Enduron | <<locked>> | 88% | 35,534 psi | 53% | 2503 fps | 96% |
| Lovex S070 | <<locked>> | 80% | 55,608 psi | 83% | 2756 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 37,782 psi | 57% | 2451 fps | 99.4% |
| Norma 204 | <<locked>> | 80% | 54,404 psi | 82% | 2779 fps | 99.9% |
| Norma 217 | <<locked>> | 82% | 29,109 psi | 44% | 2352 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 46,499 psi | 70% | 2707 fps | 99.9% |
| Norma URP | <<locked>> | 80% | 55,637 psi | 83% | 2769 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 42,018 psi | 63% | 2631 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 80% | 54,491 psi | 82% | 2779 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,710 psi | 57% | 2510 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,051 psi | 44% | 1647 fps | 100% |
| ReloadSwiss RS 76 | 70.9 gr | 80% | 35,302 psi | 53% | 2539 fps | 98.8% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 37,492 psi | 56% | 2556 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 48,675 psi | 73% | 2667 fps | 99% |
| Rottweil R 905 | <<locked>> | 80% | 47,398 psi | 71% | 2674 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 55,608 psi | 83% | 2756 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 55,767 psi | 84% | 2707 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,065 psi | 71% | 2671 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 49,617 psi | 74% | 2657 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 53,403 psi | 80% | 2723 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,776 psi | 72% | 2651 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 41,785 psi | 63% | 2533 fps | 99% |
| Vihtavuori N170 | <<locked>> | 90% | 49,922 psi | 75% | 2700 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 56,231 psi | 84% | 2766 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 47,224 psi | 71% | 2657 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,137 psi | 69% | 2703 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 80% | 38,508 psi | 58% | 2533 fps | 96.4% |
| Vihtavuori N568 | <<locked>> | 84% | 38,870 psi | 58% | 2575 fps | 95% |
| Vihtavuori N570 | 77.3 gr | 90% | 45,658 psi | 68% | 2753 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,886 psi | 61% | 2638 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,048 psi | 66% | 2585 fps | 99% |
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 60 powders for 7 mm STW loaded with the .284 | 170gr | Sierra RN Prohunter. Hodgdon Retumbo delivers the highest muzzle velocity at 2,986 fps; across all powders the maximum-charge window runs from 1,798 fps to 2,986 fps. ADI AR 2218 gives the best case fill at 100 %, and 60 of the 60 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 170.0 gr projectile in 0.284" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-50 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 7 mm STW with the .284 | 170gr | Sierra RN Prohunter they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.