Load Specifications
Bullet:.284 | 140gr | Frontier BTSP
Bullet Manufacturer:Frontier Bullets
Bullet Weight:140 gr
Bullet Diameter:0.284"
Bullet Length:<<locked>>
Caliber:7 mm WSM load data
Case Length (l3):2.09"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:81.1 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:9.0
Load data in caliber 7 mm WSM with .284 | 140gr | Frontier BTSP bullet and 99 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 and Hodgdon Superformance.
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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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 2495 | <<locked>> | 82% | 54,810 psi | 86% | 2877 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,159 psi | 88% | 2949 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,070 psi | 85% | 2992 fps | 99.5% |
| Accurate 4064 | <<locked>> | 84% | 55,274 psi | 87% | 2936 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,043 psi | 88% | 3045 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 56,202 psi | 88% | 3136 fps | 96.1% |
| ADI AR 2206H | <<locked>> | 82% | 57,667 psi | 90% | 3018 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,448 psi | 87% | 2972 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,101 psi | 89% | 3091 fps | 98.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,853 psi | 86% | 3081 fps | 96.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,607 psi | 86% | 3094 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 57,290 psi | 90% | 3087 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,202 psi | 88% | 2992 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,362 psi | 88% | 3015 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,637 psi | 89% | 3104 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,288 psi | 85% | 3071 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,478 psi | 89% | 3077 fps | 98.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,693 psi | 84% | 3077 fps | 98% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,531 psi | 79% | 3009 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,077 psi | 69% | 2927 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,462 psi | 85% | 3153 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,226 psi | 77% | 2995 fps | 96.9% |
| Bofors RP3 | <<locked>> | 86% | 57,043 psi | 89% | 3009 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,693 psi | 84% | 3077 fps | 98% |
| Bofors RP7 | <<locked>> | 90% | 56,304 psi | 88% | 2992 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 86% | 57,435 psi | 90% | 3028 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 54,723 psi | 86% | 3045 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 88% | 54,288 psi | 85% | 2999 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 98% | 54,969 psi | 86% | 3025 fps | 96% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,624 psi | 90% | 3064 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 57,130 psi | 90% | 3025 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,085 psi | 86% | 3009 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 54,723 psi | 86% | 3077 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,318 psi | 57% | 1870 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,680 psi | 87% | 2972 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,824 psi | 86% | 2953 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,348 psi | 90% | 2986 fps | 99.3% |
| IMR 4350 | <<locked>> | 94% | 57,363 psi | 90% | 3025 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,505 psi | 85% | 2966 fps | 98.9% |
| IMR 4831 | <<locked>> | 94% | 56,362 psi | 88% | 3035 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,302 psi | 85% | 2992 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,507 psi | 89% | 3012 fps | 96.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,040 psi | 82% | 3045 fps | 96.2% |
| Lovex S060 | <<locked>> | 82% | 56,202 psi | 88% | 2936 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,998 psi | 86% | 2943 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,563 psi | 86% | 2963 fps | 99.7% |
| Lovex S070 | <<locked>> | 92% | 56,057 psi | 88% | 3009 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,802 psi | 70% | 2835 fps | 98.3% |
| Norma 201 | <<locked>> | 82% | 56,231 psi | 88% | 2956 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,000 psi | 89% | 2953 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,651 psi | 87% | 3002 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,636 psi | 86% | 3025 fps | 97.7% |
| Norma MRPᴾ | <<locked>> | 100% | 57,058 psi | 89% | 3166 fps | 99.4% |
| Norma URP | <<locked>> | 92% | 54,839 psi | 86% | 3031 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,579 psi | 89% | 3028 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,359 psi | 82% | 3061 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 94% | 57,101 psi | 89% | 3084 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,876 psi | 73% | 2933 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,144 psi | 58% | 1919 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,493 psi | 90% | 3012 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,392 psi | 90% | 3087 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,725 psi | 90% | 3120 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,999 psi | 88% | 3071 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,578 psi | 86% | 3100 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,033 psi | 67% | 2940 fps | 97% |
| Rottweil R 902 | <<locked>> | 84% | 56,942 psi | 89% | 2956 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,203 psi | 90% | 3009 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,274 psi | 87% | 3002 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 98% | 55,651 psi | 87% | 3064 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 90% | 56,304 psi | 88% | 2992 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,563 psi | 86% | 2963 fps | 99.7% |
| Shooters World Precision | <<locked>> | 84% | 54,998 psi | 86% | 2943 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,057 psi | 88% | 3009 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,013 psi | 86% | 3012 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,014 psi | 88% | 2986 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,130 psi | 90% | 2884 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,737 psi | 86% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,491 psi | 85% | 2917 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,172 psi | 86% | 3058 fps | 98.2% |
| Somchem S335 | <<locked>> | 82% | 56,681 psi | 89% | 2877 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,116 psi | 90% | 3002 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,942 psi | 89% | 2992 fps | 96.4% |
| Somchem S365 | <<locked>> | 94% | 54,012 psi | 85% | 3031 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,463 psi | 88% | 3038 fps | 98.9% |
| Vihtavuori N133 | <<locked>> | 82% | 57,638 psi | 90% | 2864 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,334 psi | 90% | 2913 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,667 psi | 90% | 2930 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,911 psi | 86% | 2923 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,811 psi | 89% | 3022 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,069 psi | 82% | 2953 fps | 98% |
| Vihtavuori N540 | <<locked>> | 84% | 55,869 psi | 88% | 2927 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,898 psi | 88% | 3025 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,724 psi | 89% | 3091 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,348 psi | 90% | 3153 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,637 psi | 89% | 2989 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,723 psi | 86% | 3045 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,803 psi | 72% | 3068 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,304 psi | 88% | 2995 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,724 psi | 89% | 3035 fps | 98.2% |
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 2495 | <<locked>> | 80% | 51,590 psi | 81% | 2835 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,298 psi | 77% | 2835 fps | 97.6% |
| Accurate 3100 | <<locked>> | 88% | 35,766 psi | 56% | 2641 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 48,878 psi | 77% | 2841 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,159 psi | 58% | 2694 fps | 97.9% |
| Accurate MAGPRO | <<locked>> | 98% | 52,301 psi | 82% | 3071 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 54,157 psi | 85% | 2963 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 46,093 psi | 72% | 2812 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 43,932 psi | 69% | 2848 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 98% | 51,343 psi | 80% | 3018 fps | 95.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,836 psi | 80% | 3031 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 44,005 psi | 69% | 2844 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,398 psi | 73% | 2835 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,690 psi | 78% | 2907 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,143 psi | 57% | 2700 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,915 psi | 64% | 2831 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 43,482 psi | 68% | 2838 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 94% | 43,845 psi | 69% | 2890 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,614 psi | 42% | 2444 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 92% | 34,156 psi | 54% | 2684 fps | 95.6% |
| Alliant Reloder-26 | 59 gr | 84% | 32,532 psi | 51% | 2680 fps | 95.9% |
| Bofors RP15 | <<locked>> | 96% | 43,236 psi | 68% | 2877 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 46,949 psi | 74% | 2848 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 43,845 psi | 69% | 2890 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 41,191 psi | 65% | 2707 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 47,123 psi | 74% | 2854 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 39,189 psi | 61% | 2743 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 80% | 42,119 psi | 66% | 2766 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 96% | 51,198 psi | 80% | 2959 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 53,882 psi | 84% | 3005 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,765 psi | 53% | 2592 fps | 98.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,445 psi | 81% | 2953 fps | 100% |
| Hodgdon Superformance | 59.4 gr | 82% | 40,857 psi | 64% | 2812 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,137 psi | 43% | 1673 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,286 psi | 82% | 2920 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,472 psi | 76% | 2848 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,633 psi | 79% | 2874 fps | 98.5% |
| IMR 4350 | <<locked>> | 82% | 39,334 psi | 62% | 2690 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,685 psi | 67% | 2743 fps | 96.7% |
| IMR 4831 | <<locked>> | 80% | 35,621 psi | 56% | 2641 fps | 97.5% |
| IMR 4895 | <<locked>> | 80% | 50,952 psi | 80% | 2936 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 49,821 psi | 78% | 2897 fps | 95% |
| IMR 7828 SSC | <<locked>> | 98% | 48,675 psi | 76% | 2982 fps | 95.2% |
| Lovex S060 | <<locked>> | 80% | 53,098 psi | 83% | 2887 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,704 psi | 76% | 2844 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,263 psi | 63% | 2694 fps | 97.4% |
| Lovex S070 | <<locked>> | 80% | 38,348 psi | 60% | 2667 fps | 95.7% |
| Lovex S071 | <<locked>> | 92% | 34,664 psi | 54% | 2615 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 53,069 psi | 83% | 2907 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,476 psi | 84% | 2900 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,037 psi | 77% | 2894 fps | 100% |
| Norma 204 | <<locked>> | 86% | 44,440 psi | 70% | 2835 fps | 95.3% |
| Norma MRP | <<locked>> | 88% | 37,550 psi | 59% | 2779 fps | 95% |
| Norma URP | <<locked>> | 80% | 36,912 psi | 58% | 2684 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 80% | 49,342 psi | 77% | 2913 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 48,878 psi | 77% | 2995 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 35,824 psi | 56% | 2671 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 96% | 40,422 psi | 63% | 2795 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,731 psi | 43% | 1716 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,224 psi | 74% | 2838 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,722 psi | 84% | 3028 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,482 psi | 68% | 2890 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,898 psi | 58% | 2707 fps | 97.5% |
| ReloadSwiss RS 70 | 55.7 gr | 80% | 35,868 psi | 56% | 2710 fps | 96.7% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 40,089 psi | 63% | 2867 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 50,386 psi | 79% | 2854 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,048 psi | 69% | 2789 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 48,573 psi | 76% | 2884 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 90% | 42,641 psi | 67% | 2822 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 41,191 psi | 65% | 2707 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,263 psi | 63% | 2694 fps | 97.4% |
| Shooters World Precision | <<locked>> | 80% | 48,704 psi | 76% | 2844 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,348 psi | 60% | 2667 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,208 psi | 71% | 2844 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,649 psi | 83% | 2933 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,505 psi | 84% | 2835 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,281 psi | 71% | 2697 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,334 psi | 62% | 2631 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,250 psi | 66% | 2815 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 53,548 psi | 84% | 2835 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,527 psi | 70% | 2792 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 53,272 psi | 83% | 2933 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 33,402 psi | 52% | 2641 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 40,437 psi | 63% | 2743 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 54,070 psi | 85% | 2815 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,531 psi | 79% | 2815 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,821 psi | 80% | 2831 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,351 psi | 66% | 2717 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,348 psi | 60% | 2687 fps | 98% |
| Vihtavuori N165 | <<locked>> | 94% | 42,496 psi | 67% | 2776 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 49,095 psi | 77% | 2825 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,768 psi | 59% | 2684 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 80% | 29,211 psi | 46% | 2523 fps | 95.6% |
| Vihtavuori N560 | <<locked>> | 96% | 50,096 psi | 79% | 3025 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,594 psi | 59% | 2657 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 39,189 psi | 61% | 2743 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,745 psi | 42% | 2533 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,605 psi | 82% | 2940 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 42,772 psi | 67% | 2785 fps | 95% |
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 99 powders for 7 mm WSM loaded with the .284 | 140gr | Frontier BTSP. Norma MRP delivers the highest muzzle velocity at 3,166 fps; across all powders the maximum-charge window runs from 1,870 fps to 3,166 fps. Accurate 3100 gives the best case fill at 100 %, and 99 of the 99 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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. ReloadSwiss RS 70, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for 7 mm WSM with the .284 | 140gr | Frontier BTSP 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.