Load Specifications
Bullet:.284 | 127gr | Geco ZERO LG
Bullet Manufacturer:Geco
Bullet Weight:127 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 | 127gr | Geco ZERO LG bullet and 101 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-16 and ReloadSwiss RS 70.
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 2015 | <<locked>> | 82% | 56,608 psi | 89% | 3012 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 55,840 psi | 88% | 3038 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 57,638 psi | 90% | 3114 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,868 psi | 86% | 3051 fps | 97.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,514 psi | 74% | 3005 fps | 97.9% |
| Accurate 4064 | <<locked>> | 88% | 56,217 psi | 88% | 3094 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 57,392 psi | 90% | 3202 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 56,043 psi | 88% | 3130 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 57,334 psi | 90% | 3133 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,100 psi | 86% | 3179 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,810 psi | 86% | 3074 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,347 psi | 88% | 3045 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,666 psi | 89% | 3268 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 55,056 psi | 86% | 3176 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,230 psi | 85% | 3100 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,505 psi | 85% | 3123 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,447 psi | 85% | 3202 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,985 psi | 88% | 3238 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,244 psi | 85% | 3163 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,657 psi | 70% | 3031 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,175 psi | 61% | 2920 fps | 96.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,111 psi | 80% | 3228 fps | 99.6% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,333 psi | 88% | 3150 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 55,013 psi | 86% | 3117 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,636 psi | 86% | 3087 fps | 97.7% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,260 psi | 88% | 3054 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,636 psi | 86% | 3104 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,724 psi | 87% | 3133 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 94% | 56,028 psi | 88% | 3192 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 92% | 56,260 psi | 88% | 3153 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 84% | 56,637 psi | 89% | 3140 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,665 psi | 86% | 3123 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,884 psi | 89% | 3179 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,811 psi | 89% | 3238 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,752 psi | 56% | 1949 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,520 psi | 85% | 3091 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 57,203 psi | 90% | 3120 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,913 psi | 89% | 3120 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,405 psi | 88% | 3097 fps | 98.5% |
| IMR 4350 | <<locked>> | 96% | 55,550 psi | 87% | 3120 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,565 psi | 89% | 3123 fps | 98.4% |
| IMR 4831 | <<locked>> | 98% | 57,609 psi | 90% | 3186 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 55,941 psi | 88% | 3153 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,810 psi | 86% | 3074 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,246 psi | 88% | 3100 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,376 psi | 87% | 3054 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,724 psi | 89% | 3107 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,188 psi | 88% | 3117 fps | 99.3% |
| Lovex S070 | <<locked>> | 96% | 57,580 psi | 90% | 3159 fps | 98.8% |
| Norma 201 | <<locked>> | 84% | 54,795 psi | 86% | 3071 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,593 psi | 87% | 3071 fps | 100% |
| Norma 203B | <<locked>> | 88% | 57,334 psi | 90% | 3166 fps | 100% |
| Norma 204 | <<locked>> | 96% | 56,521 psi | 89% | 3176 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 50,531 psi | 79% | 3179 fps | 97.6% |
| Norma URP | <<locked>> | 96% | 56,144 psi | 88% | 3186 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 86% | 54,766 psi | 86% | 3136 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,969 psi | 86% | 3179 fps | 99% |
| Ramshot TAC | <<locked>> | 82% | 55,129 psi | 86% | 3097 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,129 psi | 86% | 3117 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,230 psi | 57% | 1995 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,709 psi | 87% | 3114 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,376 psi | 87% | 3196 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,448 psi | 87% | 3232 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 57,145 psi | 90% | 3222 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 56,173 psi | 88% | 3255 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 55,376 psi | 87% | 3048 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,187 psi | 86% | 3068 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,882 psi | 86% | 3110 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 56,797 psi | 89% | 3146 fps | 96% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,229 psi | 83% | 3146 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 92% | 54,636 psi | 86% | 3087 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,188 psi | 88% | 3117 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,246 psi | 88% | 3100 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,724 psi | 89% | 3107 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 57,580 psi | 90% | 3159 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 57,014 psi | 89% | 3179 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 57,566 psi | 90% | 3133 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,621 psi | 86% | 3097 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,999 psi | 88% | 3005 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,811 psi | 89% | 3002 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,478 psi | 89% | 3068 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,736 psi | 83% | 3140 fps | 96.6% |
| Somchem S335 | <<locked>> | 84% | 55,550 psi | 87% | 3002 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 57,334 psi | 90% | 3120 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,100 psi | 86% | 3107 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,737 psi | 86% | 3182 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,882 psi | 84% | 3120 fps | 97.7% |
| Vihtavuori N133 | <<locked>> | 84% | 56,449 psi | 88% | 2986 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,434 psi | 87% | 3028 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,028 psi | 88% | 3045 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,623 psi | 89% | 3084 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,621 psi | 86% | 3120 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 55,332 psi | 87% | 3074 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,433 psi | 85% | 3041 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 57,479 psi | 90% | 3182 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,922 psi | 78% | 3117 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,810 psi | 86% | 3094 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,782 psi | 87% | 3123 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,318 psi | 88% | 3199 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,205 psi | 63% | 3061 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,679 psi | 86% | 3104 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 2015 | <<locked>> | 80% | 53,243 psi | 83% | 2966 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 45,687 psi | 72% | 2881 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 53,954 psi | 85% | 3058 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,759 psi | 70% | 2864 fps | 95.3% |
| Accurate 3100 | <<locked>> | 94% | 38,145 psi | 60% | 2812 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 43,250 psi | 68% | 2877 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 34,635 psi | 54% | 2753 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 49,226 psi | 77% | 3012 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 41,872 psi | 66% | 2851 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 96% | 48,196 psi | 76% | 3048 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,401 psi | 81% | 3018 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,605 psi | 82% | 2992 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,571 psi | 71% | 3061 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 48,225 psi | 76% | 3048 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,872 psi | 66% | 2874 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,802 psi | 70% | 2943 fps | 99.1% |
| Alliant Reloder-16 | 50.7 gr | 80% | 32,416 psi | 51% | 2710 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,463 psi | 57% | 2848 fps | 98.4% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,572 psi | 75% | 3041 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 88% | 30,197 psi | 47% | 2667 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,680 psi | 57% | 2854 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,157 psi | 55% | 2864 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,066 psi | 77% | 3025 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 41,727 psi | 65% | 2877 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 45,165 psi | 71% | 2910 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,084 psi | 83% | 3005 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,952 psi | 80% | 3045 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,511 psi | 67% | 2887 fps | 97.7% |
| Hodgdon H414 | <<locked>> | 86% | 42,728 psi | 67% | 2940 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 86% | 46,311 psi | 73% | 2969 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 49,777 psi | 78% | 3025 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,704 psi | 47% | 2598 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,427 psi | 73% | 3002 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 45,498 psi | 71% | 3025 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,542 psi | 42% | 1742 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,877 psi | 75% | 2972 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 50,125 psi | 79% | 3015 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,961 psi | 69% | 2887 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,572 psi | 73% | 2917 fps | 96.6% |
| IMR 4350 | <<locked>> | 88% | 42,917 psi | 67% | 2884 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,321 psi | 65% | 2828 fps | 95% |
| IMR 4831 | <<locked>> | 82% | 33,620 psi | 53% | 2710 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 45,948 psi | 72% | 2976 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 51,401 psi | 81% | 3018 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,994 psi | 77% | 2986 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,733 psi | 76% | 2943 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 43,918 psi | 69% | 2887 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 38,508 psi | 60% | 2769 fps | 95.7% |
| Lovex S070 | <<locked>> | 86% | 41,626 psi | 65% | 2861 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 48,066 psi | 75% | 2956 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,762 psi | 76% | 2963 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,135 psi | 69% | 2930 fps | 99.3% |
| Norma 204 | <<locked>> | 92% | 49,095 psi | 77% | 3048 fps | 95.3% |
| Norma MRP | <<locked>> | 96% | 43,859 psi | 69% | 3041 fps | 95.8% |
| Norma URP | <<locked>> | 82% | 35,041 psi | 55% | 2759 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 44,280 psi | 69% | 2949 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 39,102 psi | 61% | 2864 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 51,547 psi | 81% | 3031 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,430 psi | 81% | 3054 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,035 psi | 42% | 1788 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,656 psi | 67% | 2864 fps | 96.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,051 psi | 75% | 3068 fps | 99.5% |
| ReloadSwiss RS 60 | 54.6 gr | 80% | 38,870 psi | 61% | 2920 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,606 psi | 54% | 2769 fps | 95.5% |
| ReloadSwiss RS 70 | 58.2 gr | 84% | 36,738 psi | 58% | 2844 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 51,909 psi | 81% | 2995 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,803 psi | 72% | 2907 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 39,276 psi | 62% | 2818 fps | 99% |
| Rottweil R 904 | <<locked>> | 98% | 53,417 psi | 84% | 3087 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 96% | 46,340 psi | 73% | 3018 fps | 95% |
| Rottweil R 907 | <<locked>> | 86% | 45,165 psi | 71% | 2910 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 38,508 psi | 60% | 2769 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,994 psi | 77% | 2986 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,918 psi | 69% | 2887 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 41,626 psi | 65% | 2861 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,408 psi | 63% | 2871 fps | 98.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,980 psi | 78% | 3005 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,805 psi | 75% | 2979 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,255 psi | 77% | 2900 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,292 psi | 65% | 2753 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 43,265 psi | 68% | 2831 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 49,182 psi | 77% | 3074 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 48,921 psi | 77% | 2897 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,908 psi | 78% | 3002 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 39,827 psi | 62% | 2822 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 29,254 psi | 46% | 2641 fps | 97.2% |
| Somchem S385 | <<locked>> | 94% | 43,874 psi | 69% | 2933 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 49,763 psi | 78% | 2887 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,658 psi | 72% | 2877 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,253 psi | 72% | 2890 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,058 psi | 60% | 2753 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 33,939 psi | 53% | 2700 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 51,779 psi | 81% | 3018 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,643 psi | 70% | 2881 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,576 psi | 53% | 2697 fps | 95% |
| Vihtavuori N555 | <<locked>> | 86% | 30,879 psi | 48% | 2687 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,649 psi | 53% | 2674 fps | 97.7% |
| Winchester 748 | <<locked>> | 80% | 52,214 psi | 82% | 3068 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 42,917 psi | 67% | 2943 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,558 psi | 45% | 2690 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,790 psi | 75% | 2986 fps | 99.9% |
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 101 powders for 7 mm WSM loaded with the .284 | 127gr | Geco ZERO LG. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,268 fps; across all powders the maximum-charge window runs from 1,949 fps to 3,268 fps. Accurate 3100 gives the best case fill at 100 %, and 101 of the 101 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 127.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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 60, Alliant Reloder-16, ReloadSwiss RS 70 rank at the top here: for 7 mm WSM with the .284 | 127gr | Geco ZERO LG 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.