Load Specifications
Bullet:.308 | 138gr | Hammer HHT
Bullet Manufacturer:Hammer
Bullet Weight:138 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.300 WSM load data
Case Length (l3):2.09"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:81.3 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:11.5
Load data in caliber .300 WSM with .308 | 138gr | Hammer HHT 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 60, Alliant Power Pro 2000-MR and ReloadSwiss RS 52.
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.
A valid access license is required to use the Personalized Load Calculator.
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>> | 88% | 56,913 psi | 89% | 3081 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,434 psi | 87% | 3104 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,724 psi | 87% | 3127 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 55,535 psi | 87% | 3150 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 56,362 psi | 88% | 3156 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,141 psi | 82% | 3159 fps | 98.3% |
| Accurate LT-30 | <<locked>> | 82% | 56,028 psi | 88% | 3022 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 56,478 psi | 89% | 3051 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 57,435 psi | 90% | 3192 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 94% | 54,824 psi | 86% | 3127 fps | 99.1% |
| ADI Benchmark 8208 | <<locked>> | 88% | 56,289 psi | 88% | 3140 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 88% | 56,753 psi | 89% | 3120 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 57,087 psi | 89% | 3251 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 57,116 psi | 90% | 3314 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 54,476 psi | 85% | 3153 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 84% | 57,740 psi | 90% | 3097 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 55,230 psi | 87% | 3176 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,720 psi | 79% | 3166 fps | 98.4% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,376 psi | 87% | 3278 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 56,434 psi | 88% | 3022 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 57,261 psi | 90% | 3202 fps | 99.1% |
| Bofors RP3 | <<locked>> | 94% | 55,100 psi | 86% | 3169 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 86% | 54,795 psi | 86% | 3071 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 54,534 psi | 85% | 3156 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 56,637 psi | 89% | 3264 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 86% | 56,231 psi | 88% | 3130 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 56,405 psi | 88% | 3179 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 98% | 57,566 psi | 90% | 3251 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 88% | 54,288 psi | 85% | 3143 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,905 psi | 74% | 3038 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,898 psi | 88% | 3219 fps | 99.9% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 57,159 psi | 90% | 3258 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,041 psi | 55% | 1942 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 56,855 psi | 89% | 3173 fps | 99.8% |
| IMR 3031 | <<locked>> | 92% | 55,666 psi | 87% | 3163 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 56,666 psi | 89% | 3150 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 96% | 56,608 psi | 89% | 3117 fps | 96.5% |
| IMR 4198 | <<locked>> | 82% | 54,447 psi | 85% | 3009 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 56,478 psi | 89% | 3146 fps | 96.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 43,947 psi | 69% | 2989 fps | 96.8% |
| IMR 4895 | <<locked>> | 92% | 56,623 psi | 89% | 3212 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 88% | 56,289 psi | 88% | 3140 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 84% | 56,666 psi | 89% | 3123 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 57,014 psi | 89% | 3166 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 56,927 psi | 89% | 3110 fps | 99.6% |
| Lovex S062 | <<locked>> | 94% | 57,348 psi | 90% | 3163 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 56,652 psi | 89% | 3153 fps | 97.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 53,940 psi | 85% | 3127 fps | 96.3% |
| Norma 201 | <<locked>> | 90% | 56,101 psi | 88% | 3133 fps | 99.9% |
| Norma 202 | <<locked>> | 90% | 56,507 psi | 89% | 3140 fps | 100% |
| Norma 203B | <<locked>> | 92% | 54,404 psi | 85% | 3163 fps | 99.5% |
| Norma URPᴾ | <<locked>> | 100% | 51,517 psi | 81% | 3150 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 92% | 54,998 psi | 86% | 3186 fps | 99.4% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,604 psi | 79% | 3136 fps | 96.3% |
| Ramshot TAC | <<locked>> | 88% | 56,942 psi | 89% | 3153 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 88% | 56,507 psi | 89% | 3176 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 84% | 53,896 psi | 84% | 3081 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,360 psi | 55% | 1985 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,072 psi | 88% | 3127 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 57,014 psi | 89% | 3156 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 55,434 psi | 87% | 3245 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,129 psi | 86% | 3281 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 51,837 psi | 81% | 3179 fps | 98.1% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,446 psi | 82% | 3205 fps | 97.7% |
| Rottweil R 901 | <<locked>> | 88% | 56,913 psi | 89% | 3120 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 56,391 psi | 88% | 3130 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 54,940 psi | 86% | 3156 fps | 99.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 56,652 psi | 89% | 3153 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 90% | 57,014 psi | 89% | 3166 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 57,348 psi | 90% | 3163 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,649 psi | 83% | 3107 fps | 96% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 55,695 psi | 87% | 3091 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 56,898 psi | 89% | 3222 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 57,580 psi | 90% | 3114 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,216 psi | 87% | 3127 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,695 psi | 87% | 3156 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,244 psi | 85% | 3022 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 54,288 psi | 85% | 3018 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 57,537 psi | 90% | 3104 fps | 96.6% |
| Somchem S321 | <<locked>> | 84% | 54,099 psi | 85% | 3120 fps | 99.9% |
| Somchem S335 | <<locked>> | 90% | 57,072 psi | 89% | 3071 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 54,737 psi | 86% | 3120 fps | 99.4% |
| Somchem S355 | <<locked>> | 96% | 55,361 psi | 87% | 3156 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,122 psi | 72% | 3097 fps | 99.7% |
| Unknown powderᴾ | <<locked>> | 100% | 56,318 psi | 88% | 3222 fps | 98.4% |
| Vihtavuori N130 | <<locked>> | 86% | 56,376 psi | 88% | 3028 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 57,000 psi | 89% | 3051 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 54,578 psi | 86% | 3084 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 56,159 psi | 88% | 3104 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 53,171 psi | 83% | 3084 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 57,174 psi | 90% | 3192 fps | 98.9% |
| Vihtavuori N530 | <<locked>> | 86% | 56,130 psi | 88% | 3150 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 56,057 psi | 88% | 3133 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 57,348 psi | 90% | 3245 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,682 psi | 61% | 2940 fps | 95.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,172 psi | 86% | 3133 fps | 99.8% |
| Winchester 748 | <<locked>> | 86% | 57,609 psi | 90% | 3205 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 57,566 psi | 90% | 3251 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,421 psi | 90% | 3192 fps | 99.9% |
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% | 44,106 psi | 69% | 2877 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,312 psi | 76% | 2989 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,496 psi | 67% | 2907 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 41,843 psi | 66% | 2910 fps | 99.5% |
| Accurate 4064 | <<locked>> | 80% | 35,824 psi | 56% | 2772 fps | 99.2% |
| Accurate 4350 | <<locked>> | 92% | 39,436 psi | 62% | 2910 fps | 95.3% |
| Accurate LT-30 | <<locked>> | 80% | 52,634 psi | 82% | 2969 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 53,011 psi | 83% | 2995 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 41,756 psi | 65% | 2897 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 82% | 37,782 psi | 59% | 2785 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,816 psi | 69% | 2917 fps | 98.8% |
| Alliant AR-Comp | <<locked>> | 80% | 43,584 psi | 68% | 2917 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 49,806 psi | 78% | 3123 fps | 99.3% |
| Alliant Power Pro 2000-MR | 58.3 gr | 82% | 40,480 psi | 63% | 2972 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,853 psi | 55% | 2749 fps | 96.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,082 psi | 80% | 2999 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,579 psi | 59% | 2818 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 92% | 39,523 psi | 62% | 2920 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 84% | 34,447 psi | 54% | 2815 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,011 psi | 83% | 2969 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,930 psi | 64% | 2894 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 34,403 psi | 54% | 2749 fps | 96.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,701 psi | 72% | 2910 fps | 99.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,205 psi | 65% | 2910 fps | 98.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 45,397 psi | 71% | 3061 fps | 97.7% |
| Hodgdon H322 | <<locked>> | 80% | 46,340 psi | 73% | 2969 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 40,466 psi | 63% | 2874 fps | 95% |
| Hodgdon H414 | <<locked>> | 94% | 50,140 psi | 79% | 3123 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 42,105 psi | 66% | 2910 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 33,982 psi | 53% | 2746 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,927 psi | 58% | 2848 fps | 97% |
| Hodgdon Superformance | <<locked>> | 98% | 53,055 psi | 83% | 3186 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,034 psi | 41% | 1739 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,564 psi | 57% | 2772 fps | 96.3% |
| IMR 3031 | <<locked>> | 80% | 37,855 psi | 59% | 2844 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 36,999 psi | 58% | 2759 fps | 95.4% |
| IMR 4166 Enduron | <<locked>> | 92% | 50,140 psi | 79% | 3002 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 51,300 psi | 80% | 2963 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 53,084 psi | 83% | 3091 fps | 95.7% |
| IMR 4831 | <<locked>> | 96% | 38,798 psi | 61% | 2874 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 38,450 psi | 60% | 2851 fps | 96.5% |
| IMR 8208 XBR | <<locked>> | 80% | 43,816 psi | 69% | 2917 fps | 98.8% |
| Lovex D073.5 | <<locked>> | 80% | 49,501 psi | 78% | 3009 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 40,524 psi | 64% | 2874 fps | 99.4% |
| Lovex S060 | <<locked>> | 80% | 41,959 psi | 66% | 2835 fps | 97.4% |
| Lovex S062 | <<locked>> | 80% | 36,985 psi | 58% | 2772 fps | 97.4% |
| Lovex S065 | <<locked>> | 92% | 44,266 psi | 69% | 2923 fps | 95.1% |
| Lovex S070 | <<locked>> | 98% | 50,691 psi | 79% | 3068 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 40,857 psi | 64% | 2851 fps | 98.3% |
| Norma 202 | <<locked>> | 80% | 41,031 psi | 64% | 2864 fps | 99.7% |
| Norma 203B | <<locked>> | 80% | 36,941 psi | 58% | 2805 fps | 95.9% |
| Norma URP | <<locked>> | 92% | 39,581 psi | 62% | 2907 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 36,463 psi | 57% | 2812 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 98% | 47,369 psi | 74% | 3074 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 43,816 psi | 69% | 2907 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,960 psi | 67% | 2930 fps | 97.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,427 psi | 74% | 2966 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,223 psi | 41% | 1778 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,037 psi | 77% | 3009 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 46,746 psi | 73% | 2976 fps | 95% |
| ReloadSwiss RS 52 | 55.1 gr | 80% | 38,928 psi | 61% | 2920 fps | 95.9% |
| ReloadSwiss RS 60 | 56 gr | 80% | 32,082 psi | 50% | 2762 fps | 96.9% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 41,974 psi | 66% | 2986 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 45,513 psi | 71% | 3068 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 44,715 psi | 70% | 2910 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 38,986 psi | 61% | 2799 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 80% | 32,256 psi | 51% | 2684 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 92% | 44,266 psi | 69% | 2923 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,524 psi | 64% | 2874 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 36,985 psi | 58% | 2772 fps | 97.4% |
| Shooters World SW4350 | <<locked>> | 98% | 49,400 psi | 77% | 3048 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,069 psi | 82% | 3031 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 35,636 psi | 56% | 2799 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,778 psi | 80% | 3012 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,945 psi | 66% | 2874 fps | 95.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,219 psi | 63% | 2858 fps | 96.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,395 psi | 66% | 2818 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,056 psi | 55% | 2664 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 50,256 psi | 79% | 2982 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 47,413 psi | 74% | 3002 fps | 99.5% |
| Somchem S335 | <<locked>> | 80% | 41,901 psi | 66% | 2815 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,669 psi | 65% | 2877 fps | 97.2% |
| Somchem S355 | <<locked>> | 80% | 33,243 psi | 52% | 2697 fps | 95.1% |
| Somchem S365 | <<locked>> | 88% | 31,111 psi | 49% | 2726 fps | 95.6% |
| Unknown powder | <<locked>> | 92% | 43,352 psi | 68% | 2979 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 46,949 psi | 74% | 2881 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,914 psi | 63% | 2766 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,840 psi | 58% | 2772 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,261 psi | 60% | 2782 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 82% | 30,139 psi | 47% | 2592 fps | 95.5% |
| Vihtavuori N160 | <<locked>> | 90% | 40,799 psi | 64% | 2890 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 46,108 psi | 72% | 2972 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 80% | 38,072 psi | 60% | 2802 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 90% | 41,234 psi | 65% | 2940 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 98% | 36,260 psi | 57% | 2881 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 34,563 psi | 54% | 2713 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 46,731 psi | 73% | 3022 fps | 99.7% |
| Winchester 760 | <<locked>> | 94% | 50,140 psi | 79% | 3123 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,501 psi | 78% | 3061 fps | 99.2% |
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 .300 WSM loaded with the .308 | 138gr | Hammer HHT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,314 fps; across all powders the maximum-charge window runs from 1,942 fps to 3,314 fps. Accurate 4350 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 55–90 %, leaving at least 10 % headroom. The 138.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Hodgdon Hybrid 100V 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 Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for .300 WSM with the .308 | 138gr | Hammer HHT 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.