Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 150gr | Barnes MRX BT bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and ReloadSwiss RS 60.
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% | 54,302 psi | 87% | 2940 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 53,301 psi | 85% | 2963 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,969 psi | 88% | 3031 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,985 psi | 90% | 3022 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,454 psi | 71% | 2904 fps | 96.6% |
| Accurate 4064 | <<locked>> | 88% | 53,563 psi | 86% | 3012 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 54,041 psi | 87% | 3104 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 84% | 53,882 psi | 86% | 3048 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 90% | 55,027 psi | 88% | 3051 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 56,289 psi | 90% | 3051 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 53,824 psi | 86% | 2972 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 53,824 psi | 86% | 3173 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,332 psi | 89% | 3074 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,738 psi | 89% | 3094 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 55,259 psi | 89% | 3169 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 52,721 psi | 85% | 3143 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,148 psi | 68% | 2936 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,776 psi | 77% | 3120 fps | 98.8% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 53,722 psi | 86% | 3061 fps | 99.6% |
| Bofors RP3 | <<locked>> | 90% | 55,753 psi | 89% | 3084 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,883 psi | 90% | 3058 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,215 psi | 87% | 2979 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,782 psi | 89% | 3077 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 53,185 psi | 85% | 3045 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 94% | 53,200 psi | 85% | 3097 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 92% | 53,650 psi | 86% | 3061 fps | 96.4% |
| Hodgdon H4895 | <<locked>> | 84% | 54,433 psi | 87% | 3058 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 55,158 psi | 88% | 3087 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 54,230 psi | 87% | 3094 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 53,606 psi | 86% | 3133 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,679 psi | 57% | 1909 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,622 psi | 89% | 3061 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 54,534 psi | 87% | 3041 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 54,447 psi | 87% | 3031 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 54,085 psi | 87% | 3005 fps | 97.7% |
| IMR 4350 | <<locked>> | 98% | 56,362 psi | 90% | 3084 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 92% | 54,360 psi | 87% | 3038 fps | 97.6% |
| IMR 4831 | <<locked>> | 98% | 54,694 psi | 88% | 3097 fps | 99.6% |
| IMR 4895 | <<locked>> | 86% | 53,505 psi | 86% | 3071 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 84% | 56,289 psi | 90% | 3051 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 53,592 psi | 86% | 3018 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 53,200 psi | 85% | 2972 fps | 99.9% |
| Lovex S062 | <<locked>> | 88% | 54,172 psi | 87% | 3025 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 53,606 psi | 86% | 3025 fps | 98.7% |
| Lovex S070 | <<locked>> | 96% | 54,737 psi | 88% | 3064 fps | 98% |
| Norma 201 | <<locked>> | 86% | 55,927 psi | 90% | 3045 fps | 100% |
| Norma 202 | <<locked>> | 84% | 53,156 psi | 85% | 2992 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,926 psi | 88% | 3081 fps | 100% |
| Norma MRPᴾ | <<locked>> | 100% | 47,369 psi | 76% | 3068 fps | 96.2% |
| Norma URP | <<locked>> | 96% | 53,011 psi | 85% | 3091 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 88% | 55,680 psi | 89% | 3107 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 55,477 psi | 89% | 3143 fps | 98.7% |
| Ramshot TAC | <<locked>> | 82% | 52,953 psi | 85% | 3009 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 84% | 56,289 psi | 90% | 3087 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,013 psi | 58% | 1952 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 53,287 psi | 85% | 3025 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 56,362 psi | 90% | 3166 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 56,202 psi | 90% | 3202 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 53,882 psi | 86% | 3127 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 53,171 psi | 85% | 3153 fps | 99.2% |
| Rottweil R 901 | <<locked>> | 84% | 56,420 psi | 90% | 3018 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 53,026 psi | 85% | 2989 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,622 psi | 89% | 3077 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 55,883 psi | 90% | 3058 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 53,606 psi | 86% | 3025 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 84% | 53,592 psi | 86% | 3018 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 54,172 psi | 87% | 3025 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 54,737 psi | 88% | 3064 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 53,969 psi | 87% | 3087 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,013 psi | 88% | 3045 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,738 psi | 89% | 3071 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 53,679 psi | 86% | 2927 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 54,447 psi | 87% | 2927 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 53,867 psi | 86% | 2979 fps | 97.7% |
| Somchem S335 | <<locked>> | 84% | 53,171 psi | 85% | 2923 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,737 psi | 88% | 3035 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 55,883 psi | 90% | 3077 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 55,143 psi | 88% | 3150 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,850 psi | 82% | 3022 fps | 96.5% |
| Vihtavuori N133 | <<locked>> | 84% | 54,085 psi | 87% | 2913 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 52,881 psi | 85% | 2953 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 53,635 psi | 86% | 2969 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 53,867 psi | 86% | 2999 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,622 psi | 89% | 3091 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 53,156 psi | 85% | 2995 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,535 psi | 89% | 3015 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 54,578 psi | 88% | 3091 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,847 psi | 75% | 3018 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,883 psi | 90% | 3064 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 53,316 psi | 85% | 3041 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 53,432 psi | 86% | 3100 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,666 psi | 60% | 2940 fps | 99.3% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,883 psi | 90% | 3081 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% | 50,952 psi | 82% | 2890 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,482 psi | 70% | 2805 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,329 psi | 82% | 2976 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 45,890 psi | 74% | 2838 fps | 95% |
| Accurate 3100 | <<locked>> | 98% | 41,307 psi | 66% | 2841 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 41,133 psi | 66% | 2799 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 35,172 psi | 56% | 2726 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 47,340 psi | 76% | 2930 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 40,205 psi | 64% | 2769 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,501 psi | 79% | 2940 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,314 psi | 81% | 2920 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,308 psi | 69% | 2966 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,900 psi | 64% | 2789 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,946 psi | 69% | 2861 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 84% | 35,186 psi | 56% | 2743 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,592 psi | 55% | 2756 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,487 psi | 49% | 2631 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 92% | 35,621 psi | 57% | 2831 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,891 psi | 75% | 2936 fps | 98.7% |
| Bofors RP3 | <<locked>> | 80% | 39,668 psi | 64% | 2792 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 46,064 psi | 74% | 2881 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,024 psi | 82% | 2927 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,559 psi | 78% | 2959 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,408 psi | 65% | 2795 fps | 96.7% |
| Hodgdon H414 | <<locked>> | 88% | 43,294 psi | 69% | 2907 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 90% | 50,183 psi | 80% | 2999 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 47,848 psi | 77% | 2943 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,240 psi | 48% | 2572 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,947 psi | 70% | 2910 fps | 99.6% |
| Hodgdon Superformance | 72.4 gr | 90% | 46,238 psi | 74% | 2992 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,513 psi | 43% | 1709 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,861 psi | 74% | 2890 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 47,747 psi | 77% | 2933 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,235 psi | 68% | 2805 fps | 98.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,570 psi | 71% | 2828 fps | 95.5% |
| IMR 4350 | <<locked>> | 92% | 46,601 psi | 75% | 2913 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 45,020 psi | 72% | 2861 fps | 95.5% |
| IMR 4831 | <<locked>> | 84% | 34,113 psi | 55% | 2680 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 44,034 psi | 71% | 2894 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 80% | 49,501 psi | 79% | 2940 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,644 psi | 75% | 2907 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,021 psi | 75% | 2864 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 42,076 psi | 67% | 2808 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 39,117 psi | 63% | 2743 fps | 95.4% |
| Lovex S070 | <<locked>> | 88% | 42,424 psi | 68% | 2831 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 46,079 psi | 74% | 2877 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 46,615 psi | 75% | 2884 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,279 psi | 68% | 2848 fps | 98.7% |
| Norma MRP | <<locked>> | 98% | 44,164 psi | 71% | 2999 fps | 95.2% |
| Norma URP | <<locked>> | 84% | 35,447 psi | 57% | 2730 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 42,047 psi | 67% | 2861 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 90% | 42,279 psi | 68% | 2894 fps | 95.9% |
| Ramshot TAC | <<locked>> | 80% | 49,443 psi | 79% | 2946 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,110 psi | 79% | 2966 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,716 psi | 43% | 1745 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,843 psi | 65% | 2782 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,788 psi | 73% | 2979 fps | 98.9% |
| ReloadSwiss RS 60 | 60.9 gr | 80% | 36,854 psi | 59% | 2828 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,041 psi | 56% | 2743 fps | 95.1% |
| ReloadSwiss RS 70 | 66.5 gr | 86% | 37,434 psi | 60% | 2815 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 50,053 psi | 80% | 2920 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,859 psi | 70% | 2825 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 37,159 psi | 60% | 2730 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 46,064 psi | 74% | 2881 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 84% | 39,117 psi | 63% | 2743 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,644 psi | 75% | 2907 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,076 psi | 67% | 2808 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 88% | 42,424 psi | 68% | 2831 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,537 psi | 62% | 2789 fps | 97.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,834 psi | 77% | 2920 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,905 psi | 74% | 2897 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,398 psi | 76% | 2828 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,581 psi | 63% | 2680 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 44,077 psi | 71% | 2802 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 47,036 psi | 75% | 2825 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,718 psi | 77% | 2917 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 37,985 psi | 61% | 2740 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 27,528 psi | 44% | 2546 fps | 95.7% |
| Somchem S385 | <<locked>> | 98% | 47,471 psi | 76% | 2959 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 47,863 psi | 77% | 2818 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,598 psi | 70% | 2805 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,150 psi | 71% | 2815 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,158 psi | 58% | 2667 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 82% | 34,548 psi | 55% | 2671 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 49,617 psi | 80% | 2936 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,569 psi | 68% | 2799 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 36,463 psi | 58% | 2733 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 90% | 33,083 psi | 53% | 2713 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,082 psi | 51% | 2589 fps | 96.6% |
| Winchester 748 | <<locked>> | 80% | 49,777 psi | 80% | 2986 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 43,482 psi | 70% | 2910 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,690 psi | 49% | 2720 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,469 psi | 73% | 2904 fps | 99.5% |
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 93 powders for .300 Win. Mag. loaded with the .308 | 150gr | Barnes MRX BT. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,202 fps; across all powders the maximum-charge window runs from 1,909 fps to 3,202 fps. Accurate 3100 gives the best case fill at 100 %, and 93 of the 93 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .300 Win. Mag. with the .308 | 150gr | Barnes MRX BT 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.