Load Specifications
Load data in caliber 7 mm STW with .284 | 160gr | Barnes MRX BT bullet and 71 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 Vihtavuori N560.
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>> | 90% | 56,913 psi | 85% | 2848 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,392 psi | 86% | 2867 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 60,307 psi | 90% | 3012 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 88% | 58,842 psi | 88% | 2940 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 57,246 psi | 86% | 2953 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 59,625 psi | 89% | 2982 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,982 psi | 78% | 2956 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,853 psi | 81% | 2940 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,972 psi | 88% | 2930 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 58,291 psi | 87% | 2930 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,479 psi | 86% | 2946 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 58,958 psi | 88% | 2904 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 59,480 psi | 89% | 2979 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 60,118 psi | 90% | 2995 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,450 psi | 86% | 3009 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,885 psi | 87% | 2913 fps | 98.1% |
| Bofors RP15 | <<locked>> | 92% | 56,637 psi | 85% | 2933 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 58,900 psi | 88% | 2989 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 57,479 psi | 86% | 2946 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 58,755 psi | 88% | 2874 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 57,232 psi | 86% | 2949 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 59,117 psi | 89% | 2927 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 60,234 psi | 90% | 2946 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 90% | 59,292 psi | 89% | 2930 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,885 psi | 88% | 2848 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 58,320 psi | 87% | 3061 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,463 psi | 56% | 1850 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,377 psi | 86% | 2861 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 60,118 psi | 90% | 2890 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,783 psi | 87% | 2861 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,826 psi | 85% | 2867 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 92% | 59,321 psi | 89% | 2992 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,182 psi | 74% | 2851 fps | 99% |
| Lovex S065 | <<locked>> | 82% | 57,493 psi | 86% | 2838 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 59,451 psi | 89% | 2890 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 58,595 psi | 88% | 2871 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,943 psi | 88% | 2923 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 49,937 psi | 75% | 2877 fps | 100% |
| Norma MRP | <<locked>> | 88% | 57,609 psi | 86% | 2963 fps | 100% |
| Norma URP | <<locked>> | 84% | 59,480 psi | 89% | 2904 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,434 psi | 85% | 2953 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 58,755 psi | 88% | 2917 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 59,132 psi | 89% | 2943 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,305 psi | 57% | 1890 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,943 psi | 87% | 2894 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,753 psi | 85% | 2923 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 59,683 psi | 89% | 3054 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 58,885 psi | 88% | 3018 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 88% | 59,480 psi | 89% | 2910 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 88% | 57,841 psi | 87% | 2920 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 58,755 psi | 88% | 2874 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,493 psi | 86% | 2838 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 59,451 psi | 89% | 2890 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 60,147 psi | 90% | 2844 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,435 psi | 86% | 2913 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 57,217 psi | 86% | 2848 fps | 99.3% |
| Somchem S365 | <<locked>> | 84% | 57,087 psi | 86% | 2854 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 58,247 psi | 87% | 2890 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,305 psi | 86% | 2844 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 58,247 psi | 87% | 2874 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,145 psi | 86% | 2887 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 82% | 56,565 psi | 85% | 2848 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,116 psi | 86% | 2884 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,130 psi | 86% | 2966 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 94% | 57,696 psi | 86% | 2953 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 98% | 59,335 psi | 89% | 3018 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 98% | 56,405 psi | 85% | 3015 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,058 psi | 86% | 2795 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 59,335 psi | 89% | 2930 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 59,277 psi | 89% | 2995 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 58,247 psi | 87% | 2887 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% | 40,350 psi | 60% | 2572 fps | 99.5% |
| Accurate 4350 | <<locked>> | 80% | 53,650 psi | 80% | 2815 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,090 psi | 63% | 2694 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 44,686 psi | 67% | 2707 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 80% | 40,016 psi | 60% | 2641 fps | 96.4% |
| ADI AR 2217 | <<locked>> | 86% | 36,477 psi | 55% | 2556 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 98% | 48,138 psi | 72% | 2877 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 84% | 30,937 psi | 46% | 2454 fps | 96.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,634 psi | 77% | 2822 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,701 psi | 67% | 2700 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,567 psi | 61% | 2648 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,378 psi | 59% | 2598 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,794 psi | 51% | 2520 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,251 psi | 66% | 2753 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 49,124 psi | 74% | 2871 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,659 psi | 71% | 2740 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 37,739 psi | 57% | 2582 fps | 96.8% |
| Bofors RP30 | <<locked>> | 84% | 36,143 psi | 54% | 2566 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 40,567 psi | 61% | 2648 fps | 97.9% |
| Bofors RP7 | <<locked>> | 80% | 55,158 psi | 83% | 2818 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 34,548 psi | 52% | 2510 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 55,245 psi | 83% | 2871 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 42,583 psi | 64% | 2644 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,858 psi | 63% | 2631 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,269 psi | 72% | 2697 fps | 100% |
| Hodgdon Retumbo | 66.4 gr | 80% | 33,083 psi | 50% | 2549 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,992 psi | 42% | 1654 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,415 psi | 76% | 2753 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 56,507 psi | 85% | 2841 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 50,792 psi | 76% | 2759 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,816 psi | 66% | 2644 fps | 97.1% |
| IMR 7828 SSC | <<locked>> | 80% | 38,725 psi | 58% | 2621 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,028 psi | 56% | 2605 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 54,012 psi | 81% | 2785 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,431 psi | 79% | 2785 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,577 psi | 52% | 2448 fps | 98.3% |
| Norma 204 | <<locked>> | 80% | 51,358 psi | 77% | 2805 fps | 99.5% |
| Norma 217 | <<locked>> | 86% | 30,182 psi | 45% | 2448 fps | 95% |
| Norma MRP | <<locked>> | 80% | 43,105 psi | 65% | 2720 fps | 99.3% |
| Norma URP | <<locked>> | 80% | 52,257 psi | 78% | 2802 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,566 psi | 58% | 2628 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 80% | 51,358 psi | 77% | 2805 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,534 psi | 52% | 2507 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,790 psi | 43% | 1696 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 54,099 psi | 81% | 2841 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,634 psi | 79% | 2864 fps | 100% |
| ReloadSwiss RS 76 | 71 gr | 80% | 32,140 psi | 48% | 2516 fps | 96.7% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 39,856 psi | 60% | 2677 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 45,774 psi | 69% | 2687 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 80% | 44,179 psi | 66% | 2687 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 80% | 55,158 psi | 83% | 2818 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,012 psi | 81% | 2785 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,431 psi | 79% | 2785 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,721 psi | 79% | 2740 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,845 psi | 66% | 2684 fps | 98.6% |
| Somchem S361 | <<locked>> | 80% | 46,586 psi | 70% | 2671 fps | 97.6% |
| Somchem S365 | <<locked>> | 80% | 49,734 psi | 75% | 2753 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,527 psi | 67% | 2664 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 53,708 psi | 81% | 2792 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,827 psi | 58% | 2543 fps | 97.9% |
| Vihtavuori N170 | <<locked>> | 94% | 53,374 psi | 80% | 2828 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 52,910 psi | 79% | 2795 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,656 psi | 65% | 2674 fps | 100% |
| Vihtavuori N560 | 68.9 gr | 80% | 42,931 psi | 64% | 2710 fps | 96.8% |
| Vihtavuori N565 | <<locked>> | 82% | 37,840 psi | 57% | 2582 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 88% | 40,973 psi | 61% | 2690 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 94% | 48,515 psi | 73% | 2877 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,127 psi | 80% | 2743 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 55,434 psi | 83% | 2874 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,999 psi | 55% | 2641 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,988 psi | 61% | 2595 fps | 97.9% |
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 77 powders for 7 mm STW loaded with the .284 | 160gr | Barnes MRX BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,061 fps; across all powders the maximum-charge window runs from 1,850 fps to 3,061 fps. Accurate 8700 gives the best case fill at 100 %, and 77 of the 77 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 160.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2217, ADI AR 2218 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, Vihtavuori N560 rank at the top here: for 7 mm STW with the .284 | 160gr | Barnes MRX BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, IMR 7977 Enduron, Lovex D100 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.