Load Specifications
Load data in caliber 7 mm STW with .284 | 140gr | Peregrine Bushmaster (VRG-3) bullet and 77 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 59,437 psi | 89% | 3045 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 60,350 psi | 90% | 3081 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 57,580 psi | 86% | 3146 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 92% | 58,711 psi | 88% | 3150 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 82% | 60,307 psi | 90% | 3038 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 57,595 psi | 86% | 3087 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 59,770 psi | 90% | 3156 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,722 psi | 81% | 3048 fps | 98.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,269 psi | 72% | 3002 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 57,740 psi | 87% | 3081 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,508 psi | 86% | 3084 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,784 psi | 88% | 3094 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,029 psi | 85% | 3071 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 59,770 psi | 90% | 3146 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,101 psi | 86% | 3054 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,058 psi | 86% | 3117 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 58,073 psi | 87% | 3143 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,101 psi | 86% | 3048 fps | 96.7% |
| Bofors RP15 | <<locked>> | 96% | 58,639 psi | 88% | 3127 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,768 psi | 85% | 3117 fps | 99.3% |
| Bofors RP5 | <<locked>> | 94% | 59,770 psi | 90% | 3146 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 58,059 psi | 87% | 3025 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 59,553 psi | 89% | 3140 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 84% | 57,972 psi | 87% | 3077 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,652 psi | 85% | 3035 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 59,219 psi | 89% | 3087 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 58,001 psi | 87% | 3068 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,769 psi | 87% | 3005 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 60,147 psi | 90% | 3261 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 59,292 psi | 89% | 3120 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,173 psi | 56% | 1962 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,594 psi | 85% | 3012 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 59,683 psi | 89% | 3051 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 56,637 psi | 85% | 3015 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 59,799 psi | 90% | 3071 fps | 99% |
| IMR 7828 SSC | <<locked>> | 94% | 57,653 psi | 86% | 3130 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,511 psi | 65% | 2894 fps | 96.6% |
| Lovex S065 | <<locked>> | 86% | 60,321 psi | 90% | 3045 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,639 psi | 88% | 3041 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,724 psi | 85% | 3005 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,870 psi | 87% | 3068 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 43,801 psi | 66% | 2917 fps | 98.7% |
| Norma MRP | <<locked>> | 92% | 59,944 psi | 90% | 3166 fps | 100% |
| Norma URP | <<locked>> | 86% | 58,421 psi | 88% | 3061 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 58,668 psi | 88% | 3153 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 57,508 psi | 86% | 3068 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,276 psi | 86% | 3077 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,913 psi | 57% | 2008 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,710 psi | 85% | 3045 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 59,393 psi | 89% | 3133 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,043 psi | 86% | 3186 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,318 psi | 84% | 3133 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 82% | 59,611 psi | 89% | 3022 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 58,552 psi | 88% | 3054 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 56,478 psi | 85% | 3061 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 58,059 psi | 87% | 3025 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 60,321 psi | 90% | 3045 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,639 psi | 88% | 3041 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 59,045 psi | 89% | 2890 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 59,625 psi | 89% | 2999 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 60,133 psi | 90% | 3117 fps | 99.8% |
| Somchem S355 | <<locked>> | 82% | 59,132 psi | 89% | 3015 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 56,362 psi | 84% | 2982 fps | 98.3% |
| Somchem S365 | <<locked>> | 88% | 59,669 psi | 89% | 3061 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,956 psi | 85% | 3028 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 56,710 psi | 85% | 2933 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 60,350 psi | 90% | 3054 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,811 psi | 85% | 3012 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 59,393 psi | 89% | 3054 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 59,176 psi | 89% | 3081 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 59,553 psi | 89% | 3166 fps | 99% |
| Vihtavuori N565 | <<locked>> | 98% | 59,814 psi | 90% | 3140 fps | 99.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,072 psi | 86% | 3140 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 60,278 psi | 90% | 3002 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 58,218 psi | 87% | 3084 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,217 psi | 84% | 3136 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,159 psi | 86% | 3028 fps | 99.6% |
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% | 36,361 psi | 55% | 2631 fps | 97.6% |
| Accurate 4350 | <<locked>> | 80% | 48,834 psi | 73% | 2907 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 42,975 psi | 64% | 2871 fps | 96% |
| Accurate MAGPRO | <<locked>> | 86% | 47,094 psi | 71% | 2943 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 56,652 psi | 85% | 2986 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 40,640 psi | 61% | 2772 fps | 96.4% |
| ADI AR 2213 | <<locked>> | 84% | 41,872 psi | 63% | 2825 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 92% | 40,495 psi | 61% | 2785 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 90% | 34,084 psi | 51% | 2674 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,147 psi | 62% | 2772 fps | 96.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,992 psi | 70% | 2913 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,795 psi | 82% | 3038 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,756 psi | 61% | 2766 fps | 96.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,521 psi | 55% | 2700 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,259 psi | 53% | 2664 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,342 psi | 45% | 2559 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,276 psi | 59% | 2808 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,476 psi | 80% | 2982 fps | 95.8% |
| Bofors RP15 | <<locked>> | 84% | 39,088 psi | 59% | 2756 fps | 95.8% |
| Bofors RP30 | <<locked>> | 90% | 39,827 psi | 60% | 2795 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 36,521 psi | 55% | 2700 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 51,126 psi | 77% | 2913 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 38,740 psi | 58% | 2746 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 50,560 psi | 76% | 2959 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 52,982 psi | 79% | 2976 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 44,672 psi | 67% | 2831 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 43,903 psi | 66% | 2815 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,005 psi | 66% | 2785 fps | 100% |
| Hodgdon Retumbo | 71.8 gr | 86% | 36,637 psi | 55% | 2779 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 50,894 psi | 76% | 2986 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,789 psi | 42% | 1762 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,470 psi | 70% | 2838 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,533 psi | 79% | 2940 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 46,427 psi | 70% | 2848 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 43,163 psi | 65% | 2772 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 86% | 43,250 psi | 65% | 2867 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,582 psi | 61% | 2828 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 50,009 psi | 75% | 2884 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 48,341 psi | 72% | 2871 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 31,125 psi | 47% | 2497 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 46,992 psi | 70% | 2881 fps | 97.9% |
| Norma 217 | <<locked>> | 94% | 35,259 psi | 53% | 2720 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 38,537 psi | 58% | 2769 fps | 97.2% |
| Norma URP | <<locked>> | 80% | 47,834 psi | 72% | 2894 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 40,190 psi | 60% | 2805 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 46,891 psi | 70% | 2887 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 35,853 psi | 54% | 2674 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,355 psi | 43% | 1801 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,139 psi | 74% | 2927 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,456 psi | 71% | 2946 fps | 100% |
| ReloadSwiss RS 76 | 75 gr | 84% | 33,344 psi | 50% | 2677 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,266 psi | 66% | 2913 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 55,883 psi | 84% | 2969 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 42,018 psi | 63% | 2756 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 40,074 psi | 60% | 2749 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 80% | 51,126 psi | 77% | 2913 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,009 psi | 75% | 2884 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 48,341 psi | 72% | 2871 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 55,390 psi | 83% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,052 psi | 74% | 2831 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,755 psi | 60% | 2746 fps | 96.3% |
| Somchem S355 | <<locked>> | 80% | 55,535 psi | 83% | 2963 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 42,757 psi | 64% | 2736 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 44,947 psi | 67% | 2841 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,524 psi | 61% | 2730 fps | 97.4% |
| Vihtavuori N150 | <<locked>> | 80% | 53,185 psi | 80% | 2881 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,284 psi | 74% | 2887 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,172 psi | 53% | 2595 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 48,762 psi | 73% | 2890 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,334 psi | 59% | 2743 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 44,759 psi | 67% | 2897 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 88% | 41,872 psi | 63% | 2815 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 94% | 45,455 psi | 68% | 2930 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,849 psi | 73% | 2841 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,778 psi | 76% | 2963 fps | 99.6% |
| Winchester StaBALL HD | 68.6 gr | 80% | 31,807 psi | 48% | 2677 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,144 psi | 56% | 2651 fps | 95.3% |
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 | 140gr | Peregrine Bushmaster (VRG-3). Hodgdon Retumbo delivers the highest muzzle velocity at 3,261 fps; across all powders the maximum-charge window runs from 1,962 fps to 3,261 fps. ADI AR 2217 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 140.0 gr projectile in 0.284" calls for a 1:12.0 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, Winchester StaBALL HD rank at the top here: for 7 mm STW with the .284 | 140gr | Peregrine Bushmaster (VRG-3) 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.