Load Specifications
Load data in caliber 7 mm STW with .284 | 150gr | Osprey Virtus 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 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% | 59,495 psi | 89% | 2959 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,478 psi | 85% | 2936 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 58,813 psi | 88% | 3068 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 90% | 57,812 psi | 87% | 3002 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 94% | 59,944 psi | 90% | 3071 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,722 psi | 81% | 2966 fps | 99.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,138 psi | 72% | 2920 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,769 psi | 87% | 2995 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 59,016 psi | 88% | 3005 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,276 psi | 86% | 2989 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 94% | 59,944 psi | 90% | 3061 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,290 psi | 86% | 2969 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,174 psi | 86% | 3031 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 58,117 psi | 87% | 3058 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,058 psi | 86% | 2966 fps | 97.1% |
| Bofors RP15 | <<locked>> | 96% | 58,784 psi | 88% | 3041 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,811 psi | 85% | 3035 fps | 99.5% |
| Bofors RP5 | <<locked>> | 94% | 59,944 psi | 90% | 3061 fps | 99.9% |
| Bofors RP7 | <<locked>> | 84% | 58,450 psi | 88% | 2940 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 59,712 psi | 90% | 3058 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 84% | 58,204 psi | 87% | 2992 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,855 psi | 85% | 2949 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 92% | 59,248 psi | 89% | 3002 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 58,001 psi | 87% | 2982 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,899 psi | 87% | 2913 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 60,017 psi | 90% | 3173 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 59,306 psi | 89% | 3031 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,188 psi | 56% | 1886 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,753 psi | 85% | 2927 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 59,886 psi | 90% | 2963 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 56,797 psi | 85% | 2927 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 59,930 psi | 90% | 2982 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 94% | 57,798 psi | 87% | 3045 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,656 psi | 65% | 2822 fps | 97.2% |
| Lovex S065 | <<locked>> | 84% | 56,840 psi | 85% | 2904 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,769 psi | 88% | 2956 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,971 psi | 85% | 2923 fps | 100% |
| Norma 204 | <<locked>> | 86% | 58,044 psi | 87% | 2982 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 43,947 psi | 66% | 2848 fps | 99.1% |
| Norma MRP | <<locked>> | 92% | 59,959 psi | 90% | 3081 fps | 100% |
| Norma URP | <<locked>> | 86% | 58,581 psi | 88% | 2972 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 58,798 psi | 88% | 3068 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 86% | 57,682 psi | 86% | 2979 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,450 psi | 86% | 2999 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,985 psi | 57% | 1929 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,826 psi | 85% | 2959 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 59,553 psi | 89% | 3045 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,043 psi | 86% | 3100 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,507 psi | 85% | 3061 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 82% | 59,901 psi | 90% | 2933 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 58,479 psi | 88% | 2966 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 90% | 56,710 psi | 85% | 2976 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 58,450 psi | 88% | 2940 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,840 psi | 85% | 2904 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,769 psi | 88% | 2956 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 59,248 psi | 89% | 2799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 59,828 psi | 90% | 2910 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 60,292 psi | 90% | 3028 fps | 99.9% |
| Somchem S355 | <<locked>> | 82% | 59,364 psi | 89% | 2927 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 56,405 psi | 85% | 2900 fps | 98.7% |
| Somchem S365 | <<locked>> | 88% | 59,741 psi | 90% | 2972 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,029 psi | 85% | 2943 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,000 psi | 85% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,666 psi | 85% | 2913 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,869 psi | 85% | 2927 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 59,712 psi | 90% | 2969 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 59,205 psi | 89% | 2995 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 59,538 psi | 89% | 3077 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 98% | 59,669 psi | 89% | 3058 fps | 99.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,029 psi | 85% | 3058 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,405 psi | 85% | 2864 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 58,450 psi | 88% | 2995 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,318 psi | 84% | 3051 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,232 psi | 86% | 2943 fps | 99.7% |
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% | 36,535 psi | 55% | 2562 fps | 98.1% |
| Accurate 4350 | <<locked>> | 80% | 49,052 psi | 74% | 2822 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 43,888 psi | 66% | 2799 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 40,988 psi | 61% | 2700 fps | 97% |
| ADI AR 2213 | <<locked>> | 82% | 39,131 psi | 59% | 2687 fps | 95% |
| ADI AR 2217 | <<locked>> | 90% | 38,000 psi | 57% | 2654 fps | 95% |
| ADI AR 2225 | <<locked>> | 88% | 31,894 psi | 48% | 2543 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,094 psi | 71% | 2828 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,853 psi | 82% | 2946 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,930 psi | 61% | 2694 fps | 97.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,753 psi | 55% | 2631 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,360 psi | 53% | 2592 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,618 psi | 46% | 2500 fps | 96.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,465 psi | 59% | 2740 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 50,169 psi | 75% | 2844 fps | 95.5% |
| Bofors RP15 | <<locked>> | 82% | 36,608 psi | 55% | 2625 fps | 95.5% |
| Bofors RP30 | <<locked>> | 88% | 37,260 psi | 56% | 2664 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 36,753 psi | 55% | 2631 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 51,227 psi | 77% | 2828 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 88% | 38,870 psi | 58% | 2677 fps | 96.1% |
| Hodgdon H414 | <<locked>> | 80% | 50,937 psi | 76% | 2877 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 53,272 psi | 80% | 2894 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 82% | 41,771 psi | 63% | 2694 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 82% | 41,060 psi | 62% | 2677 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,251 psi | 66% | 2710 fps | 100% |
| Hodgdon Retumbo | 67.2 gr | 84% | 34,330 psi | 51% | 2648 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 51,053 psi | 77% | 2904 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,746 psi | 42% | 1690 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,818 psi | 70% | 2762 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,634 psi | 79% | 2851 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 46,586 psi | 70% | 2769 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,625 psi | 61% | 2641 fps | 95.2% |
| IMR 7828 SSC | 67.1 gr | 84% | 40,480 psi | 61% | 2730 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 96% | 37,942 psi | 57% | 2697 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 50,082 psi | 75% | 2799 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,501 psi | 73% | 2792 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 31,372 psi | 47% | 2434 fps | 96.4% |
| Norma 204 | <<locked>> | 80% | 47,152 psi | 71% | 2802 fps | 98.4% |
| Norma 217 | <<locked>> | 92% | 32,967 psi | 49% | 2592 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 38,769 psi | 58% | 2703 fps | 97.8% |
| Norma URP | <<locked>> | 80% | 48,008 psi | 72% | 2808 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 40,263 psi | 60% | 2733 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 47,050 psi | 71% | 2808 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 33,286 psi | 50% | 2539 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,355 psi | 43% | 1729 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,197 psi | 74% | 2844 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,819 psi | 72% | 2867 fps | 100% |
| ReloadSwiss RS 76 | 71.9 gr | 84% | 33,547 psi | 50% | 2621 fps | 96.4% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,425 psi | 67% | 2844 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 56,028 psi | 84% | 2881 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 42,119 psi | 63% | 2680 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 80% | 40,219 psi | 60% | 2677 fps | 97% |
| Rottweil R 907 | <<locked>> | 80% | 51,227 psi | 77% | 2828 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,082 psi | 75% | 2799 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,501 psi | 73% | 2792 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 55,709 psi | 84% | 2753 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,994 psi | 73% | 2746 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,900 psi | 60% | 2671 fps | 96.9% |
| Somchem S355 | <<locked>> | 80% | 55,593 psi | 83% | 2874 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 43,033 psi | 65% | 2667 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 45,353 psi | 68% | 2766 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,770 psi | 61% | 2661 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 80% | 53,345 psi | 80% | 2795 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,487 psi | 74% | 2805 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,346 psi | 53% | 2530 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 48,878 psi | 73% | 2805 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,610 psi | 59% | 2671 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 41,655 psi | 62% | 2756 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 88% | 42,148 psi | 63% | 2749 fps | 96% |
| Vihtavuori N568 | <<locked>> | 94% | 45,643 psi | 68% | 2861 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,820 psi | 73% | 2756 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,937 psi | 76% | 2877 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,010 psi | 48% | 2612 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,420 psi | 56% | 2585 fps | 96% |
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 74 powders for 7 mm STW loaded with the .284 | 150gr | Osprey Virtus. Hodgdon Retumbo delivers the highest muzzle velocity at 3,173 fps; across all powders the maximum-charge window runs from 1,886 fps to 3,173 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 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 150.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Bofors RP30 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, IMR 7828 SSC rank at the top here: for 7 mm STW with the .284 | 150gr | Osprey Virtus 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.