Load Specifications
Load data in caliber .300 WSM with .308 | 138gr | Hasler ARIETE 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 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.
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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>> | 88% | 57,130 psi | 90% | 3084 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,680 psi | 87% | 3107 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 54,882 psi | 86% | 3094 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 56,028 psi | 88% | 3159 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 54,795 psi | 86% | 3140 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 51,097 psi | 80% | 3150 fps | 98.2% |
| Accurate LT-30 | <<locked>> | 82% | 56,260 psi | 88% | 3028 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 56,724 psi | 89% | 3054 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 56,405 psi | 88% | 3182 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 96% | 57,450 psi | 90% | 3176 fps | 99.4% |
| ADI AR 2219 | <<locked>> | 82% | 57,580 psi | 90% | 3156 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 55,695 psi | 87% | 3136 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 88% | 55,753 psi | 87% | 3114 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 57,334 psi | 90% | 3255 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 56,420 psi | 88% | 3307 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 57,203 psi | 90% | 3199 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 84% | 56,797 psi | 89% | 3094 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 54,447 psi | 85% | 3169 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 49,980 psi | 78% | 3159 fps | 98.3% |
| Alliant Reloder-17 | <<locked>> | 98% | 54,549 psi | 85% | 3268 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 55,666 psi | 87% | 3015 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 56,594 psi | 89% | 3199 fps | 99.1% |
| Bofors RP3 | <<locked>> | 96% | 57,740 psi | 90% | 3215 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 88% | 57,609 psi | 90% | 3123 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 54,723 psi | 86% | 3163 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 56,811 psi | 89% | 3271 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 86% | 55,376 psi | 87% | 3123 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 57,174 psi | 90% | 3159 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 55,492 psi | 87% | 3169 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 98% | 56,739 psi | 89% | 3245 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 90% | 56,956 psi | 89% | 3196 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,876 psi | 72% | 3025 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 56,318 psi | 88% | 3225 fps | 99.9% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 56,275 psi | 88% | 3248 fps | 96.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,751 psi | 54% | 1942 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 57,029 psi | 89% | 3176 fps | 99.8% |
| IMR 3031 | <<locked>> | 92% | 54,694 psi | 86% | 3156 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 56,072 psi | 88% | 3146 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 96% | 55,724 psi | 87% | 3107 fps | 96.4% |
| IMR 4198 | <<locked>> | 84% | 57,130 psi | 90% | 3054 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 56,884 psi | 89% | 3156 fps | 96.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 43,004 psi | 67% | 2976 fps | 96.6% |
| IMR 4895 | <<locked>> | 92% | 55,854 psi | 88% | 3205 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 88% | 55,695 psi | 87% | 3136 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 84% | 55,709 psi | 87% | 3117 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 56,028 psi | 88% | 3159 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 56,376 psi | 88% | 3110 fps | 99.6% |
| Lovex S062 | <<locked>> | 94% | 56,463 psi | 88% | 3159 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 55,753 psi | 87% | 3143 fps | 97.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 53,055 psi | 83% | 3117 fps | 96.2% |
| Norma 201 | <<locked>> | 90% | 54,926 psi | 86% | 3123 fps | 99.9% |
| Norma 202 | <<locked>> | 90% | 55,506 psi | 87% | 3130 fps | 100% |
| Norma 203B | <<locked>> | 94% | 57,087 psi | 89% | 3212 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 50,691 psi | 79% | 3143 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 92% | 54,215 psi | 85% | 3179 fps | 99.4% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 49,835 psi | 78% | 3130 fps | 96.2% |
| Ramshot TAC | <<locked>> | 88% | 56,246 psi | 88% | 3150 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 88% | 55,535 psi | 87% | 3169 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 86% | 56,826 psi | 89% | 3136 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,201 psi | 55% | 1991 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 55,172 psi | 86% | 3120 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 55,927 psi | 88% | 3146 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 54,650 psi | 86% | 3238 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 54,389 psi | 85% | 3274 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 50,908 psi | 80% | 3169 fps | 98% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 51,605 psi | 81% | 3199 fps | 97.6% |
| Rottweil R 901 | <<locked>> | 88% | 55,593 psi | 87% | 3110 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 55,230 psi | 87% | 3117 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 98% | 57,566 psi | 90% | 3205 fps | 99.9% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 55,753 psi | 87% | 3143 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 90% | 56,028 psi | 88% | 3159 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 56,463 psi | 88% | 3159 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 53,055 psi | 83% | 3117 fps | 96.2% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 54,752 psi | 86% | 3084 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 55,883 psi | 88% | 3212 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 54,534 psi | 85% | 3071 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 54,346 psi | 85% | 3120 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,013 psi | 86% | 3150 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 56,869 psi | 89% | 3068 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 56,942 psi | 89% | 3061 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 56,666 psi | 89% | 3094 fps | 96.5% |
| Somchem S321 | <<locked>> | 86% | 56,985 psi | 89% | 3169 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 56,072 psi | 88% | 3064 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 54,012 psi | 85% | 3117 fps | 99.4% |
| Somchem S355 | <<locked>> | 96% | 54,172 psi | 85% | 3143 fps | 99.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 45,223 psi | 71% | 3084 fps | 99.6% |
| Unknown powderᴾ | <<locked>> | 100% | 55,506 psi | 87% | 3215 fps | 98.3% |
| Vihtavuori N120 | <<locked>> | 82% | 57,609 psi | 90% | 2982 fps | 100% |
| Vihtavuori N130 | <<locked>> | 86% | 55,550 psi | 87% | 3022 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 56,159 psi | 88% | 3045 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 54,853 psi | 86% | 3091 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 55,158 psi | 86% | 3097 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 52,069 psi | 82% | 3071 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 56,289 psi | 88% | 3186 fps | 98.8% |
| Vihtavuori N530 | <<locked>> | 86% | 55,187 psi | 86% | 3140 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 92% | 55,056 psi | 86% | 3123 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 56,449 psi | 88% | 3238 fps | 98.8% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 54,418 psi | 85% | 3130 fps | 99.8% |
| Winchester 748 | <<locked>> | 86% | 56,637 psi | 89% | 3196 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 56,739 psi | 89% | 3245 fps | 96.8% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,710 psi | 89% | 3189 fps | 99.8% |
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% | 44,382 psi | 70% | 2881 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,515 psi | 76% | 2992 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,390 psi | 57% | 2769 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,076 psi | 66% | 2917 fps | 99.6% |
| Accurate 4064 | <<locked>> | 80% | 34,432 psi | 54% | 2749 fps | 99% |
| Accurate 4350 | <<locked>> | 92% | 38,348 psi | 60% | 2894 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 52,881 psi | 83% | 2976 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 53,258 psi | 83% | 3002 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,843 psi | 64% | 2884 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 82% | 36,985 psi | 58% | 2772 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 54,012 psi | 85% | 3104 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,960 psi | 67% | 2907 fps | 98.7% |
| Alliant AR-Comp | <<locked>> | 80% | 42,409 psi | 66% | 2907 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,082 psi | 78% | 3130 fps | 99.3% |
| Alliant Power Pro 2000-MR | 58.6 gr | 82% | 39,595 psi | 62% | 2956 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,895 psi | 53% | 2733 fps | 95.9% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,183 psi | 79% | 2992 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,622 psi | 57% | 2802 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 92% | 38,653 psi | 61% | 2907 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 86% | 36,056 psi | 56% | 2871 fps | 96% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 52,257 psi | 82% | 2966 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,059 psi | 63% | 2877 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 33,243 psi | 52% | 2726 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,889 psi | 70% | 2904 fps | 99.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,408 psi | 65% | 2917 fps | 98.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 45,643 psi | 72% | 3068 fps | 97.8% |
| Hodgdon H322 | <<locked>> | 80% | 45,513 psi | 71% | 2959 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 53,214 psi | 83% | 3097 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 42,264 psi | 66% | 2920 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 94% | 49,081 psi | 77% | 3107 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 41,176 psi | 65% | 2900 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 35,273 psi | 55% | 2785 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,969 psi | 55% | 2799 fps | 96.4% |
| Hodgdon Superformance | <<locked>> | 98% | 52,156 psi | 82% | 3176 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,773 psi | 40% | 1739 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,579 psi | 57% | 2776 fps | 96.4% |
| IMR 3031 | <<locked>> | 80% | 36,912 psi | 58% | 2831 fps | 99.9% |
| IMR 4064 | <<locked>> | 82% | 36,158 psi | 57% | 2749 fps | 95.1% |
| IMR 4166 Enduron | <<locked>> | 94% | 52,431 psi | 82% | 3051 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 50,691 psi | 79% | 2959 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 50,067 psi | 78% | 3038 fps | 95% |
| IMR 4831 | <<locked>> | 98% | 40,263 psi | 63% | 2917 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 37,492 psi | 59% | 2838 fps | 96.2% |
| IMR 8208 XBR | <<locked>> | 80% | 42,960 psi | 67% | 2907 fps | 98.7% |
| Lovex D073.5 | <<locked>> | 80% | 48,283 psi | 76% | 2995 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 39,378 psi | 62% | 2861 fps | 99.2% |
| Lovex S060 | <<locked>> | 80% | 41,234 psi | 65% | 2825 fps | 97.3% |
| Lovex S062 | <<locked>> | 80% | 35,984 psi | 56% | 2756 fps | 97.1% |
| Lovex S065 | <<locked>> | 94% | 46,006 psi | 72% | 2969 fps | 95.7% |
| Lovex S070 | <<locked>> | 98% | 49,763 psi | 78% | 3058 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 39,784 psi | 62% | 2835 fps | 98.1% |
| Norma 202 | <<locked>> | 80% | 40,074 psi | 63% | 2854 fps | 99.6% |
| Norma 203B | <<locked>> | 80% | 35,984 psi | 56% | 2789 fps | 95.6% |
| Norma URP | <<locked>> | 92% | 38,783 psi | 61% | 2897 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 35,549 psi | 56% | 2799 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 98% | 46,528 psi | 73% | 3064 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 42,960 psi | 67% | 2897 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,279 psi | 66% | 2920 fps | 97.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,528 psi | 73% | 2956 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,904 psi | 41% | 1778 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,414 psi | 76% | 3005 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 48,907 psi | 77% | 3025 fps | 95.6% |
| ReloadSwiss RS 52 | 55.5 gr | 80% | 38,203 psi | 60% | 2907 fps | 95.7% |
| ReloadSwiss RS 60 | 56.3 gr | 80% | 31,198 psi | 49% | 2743 fps | 96.5% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 41,089 psi | 64% | 2976 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 44,730 psi | 70% | 3058 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 43,497 psi | 68% | 2894 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 37,884 psi | 59% | 2785 fps | 97.6% |
| Rottweil R 903 | <<locked>> | 82% | 33,330 psi | 52% | 2723 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 46,006 psi | 72% | 2969 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,378 psi | 62% | 2861 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 35,984 psi | 56% | 2756 fps | 97.1% |
| Shooters World SW4350 | <<locked>> | 98% | 49,763 psi | 78% | 3058 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 51,169 psi | 80% | 3025 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 37,173 psi | 58% | 2844 fps | 95.9% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,082 psi | 80% | 3018 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,901 psi | 64% | 2861 fps | 95% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,523 psi | 62% | 2848 fps | 96.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,524 psi | 65% | 2805 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,229 psi | 54% | 2651 fps | 99.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 49,342 psi | 77% | 2972 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 46,412 psi | 73% | 2989 fps | 99.4% |
| Somchem S335 | <<locked>> | 80% | 40,930 psi | 64% | 2805 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 40,785 psi | 64% | 2867 fps | 97% |
| Somchem S355 | <<locked>> | 82% | 34,403 psi | 54% | 2736 fps | 95.6% |
| Somchem S365 | <<locked>> | 88% | 30,081 psi | 47% | 2703 fps | 95.1% |
| Unknown powder | <<locked>> | 92% | 42,583 psi | 67% | 2969 fps | 95.4% |
| Vihtavuori N120 | <<locked>> | 80% | 54,056 psi | 85% | 2933 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 46,151 psi | 72% | 2877 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,914 psi | 61% | 2753 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,101 psi | 58% | 2779 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,347 psi | 59% | 2772 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 82% | 29,196 psi | 46% | 2575 fps | 95.1% |
| Vihtavuori N160 | <<locked>> | 90% | 39,987 psi | 63% | 2881 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 45,237 psi | 71% | 2963 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 80% | 37,173 psi | 58% | 2789 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 90% | 40,190 psi | 63% | 2927 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 33,663 psi | 53% | 2700 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 45,803 psi | 72% | 3012 fps | 99.6% |
| Winchester 760 | <<locked>> | 94% | 49,081 psi | 77% | 3107 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,776 psi | 76% | 3054 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 113 powders for .300 WSM loaded with the .308 | 138gr | Hasler ARIETE. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,307 fps; across all powders the maximum-charge window runs from 1,942 fps to 3,307 fps. Accurate 3100 gives the best case fill at 100 %, and 113 of the 113 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 49–90 %, leaving at least 10 % headroom. The 138.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, Alliant Reloder-16 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 | Hasler ARIETE they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-26, Hodgdon H4350 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.