Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 165gr | Frontier BTSP bullet and 90 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Alliant Reloder-16.
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 2495 | <<locked>> | 82% | 56,637 psi | 89% | 2894 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,522 psi | 90% | 2966 fps | 98.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,014 psi | 88% | 3012 fps | 99.7% |
| Accurate 4064 | <<locked>> | 84% | 56,971 psi | 89% | 2949 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,288 psi | 85% | 3009 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 56,724 psi | 89% | 2982 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,114 psi | 86% | 3048 fps | 98% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,666 psi | 89% | 3104 fps | 97.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,405 psi | 88% | 3110 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,696 psi | 90% | 3005 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,476 psi | 85% | 2976 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,027 psi | 86% | 3064 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,318 psi | 88% | 3087 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,694 psi | 86% | 3035 fps | 98% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,738 psi | 87% | 3100 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,634 psi | 82% | 3025 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,716 psi | 72% | 2949 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,898 psi | 89% | 3176 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,111 psi | 80% | 3018 fps | 97.3% |
| Bofors RP3 | <<locked>> | 84% | 55,187 psi | 86% | 2972 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,738 psi | 87% | 3100 fps | 98.3% |
| Bofors RP7 | <<locked>> | 88% | 54,404 psi | 85% | 2953 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 84% | 55,419 psi | 87% | 2989 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 56,492 psi | 89% | 3061 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 88% | 56,057 psi | 88% | 3018 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 98% | 56,797 psi | 89% | 3045 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,608 psi | 87% | 3025 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,259 psi | 87% | 2986 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,840 psi | 89% | 3025 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,831 psi | 70% | 2979 fps | 96.5% |
| Hodgdon Superformance | <<locked>> | 90% | 57,000 psi | 89% | 3100 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,492 psi | 57% | 1877 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,290 psi | 90% | 2989 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,260 psi | 88% | 2966 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,288 psi | 87% | 2946 fps | 99.1% |
| IMR 4350 | <<locked>> | 92% | 55,535 psi | 87% | 2989 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,072 psi | 88% | 2986 fps | 99.2% |
| IMR 4831 | <<locked>> | 92% | 54,694 psi | 86% | 2999 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,912 psi | 88% | 3005 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,534 psi | 85% | 2972 fps | 96.2% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,070 psi | 85% | 3071 fps | 96.7% |
| Lovex S060 | <<locked>> | 82% | 57,638 psi | 90% | 2949 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,463 psi | 88% | 2956 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,347 psi | 88% | 2982 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 57,653 psi | 90% | 3025 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,528 psi | 73% | 2854 fps | 98.6% |
| Norma 203B | <<locked>> | 84% | 57,145 psi | 90% | 3012 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,463 psi | 88% | 3045 fps | 98.1% |
| Norma MRP | <<locked>> | 98% | 55,361 psi | 87% | 3127 fps | 99.3% |
| Norma URP | <<locked>> | 92% | 56,579 psi | 89% | 3045 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,462 psi | 85% | 2986 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,578 psi | 86% | 3091 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 92% | 55,448 psi | 87% | 3048 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,733 psi | 76% | 2956 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,159 psi | 58% | 1919 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,259 psi | 87% | 2969 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,854 psi | 88% | 3081 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,157 psi | 85% | 3028 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,318 psi | 88% | 3114 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,918 psi | 70% | 2972 fps | 97.7% |
| Rottweil R 902 | <<locked>> | 82% | 54,926 psi | 86% | 2917 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,245 psi | 87% | 2966 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,927 psi | 89% | 3018 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 98% | 57,435 psi | 90% | 3081 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 54,404 psi | 85% | 2953 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,347 psi | 88% | 2982 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 56,463 psi | 88% | 2956 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,653 psi | 90% | 3025 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,927 psi | 89% | 3028 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,667 psi | 90% | 3002 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,941 psi | 88% | 2848 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,014 psi | 88% | 2933 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,942 psi | 89% | 3074 fps | 98.4% |
| Somchem S355 | <<locked>> | 86% | 55,230 psi | 87% | 2966 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,984 psi | 86% | 2953 fps | 96.1% |
| Somchem S365 | <<locked>> | 94% | 56,202 psi | 88% | 3051 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,578 psi | 86% | 2999 fps | 98.7% |
| Vihtavuori N135 | <<locked>> | 82% | 55,332 psi | 87% | 2877 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,724 psi | 87% | 2894 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,550 psi | 89% | 2936 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,042 psi | 86% | 2986 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,795 psi | 84% | 2969 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 84% | 57,377 psi | 90% | 2936 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,331 psi | 85% | 2992 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 98% | 55,100 psi | 86% | 3051 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,535 psi | 87% | 3110 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,592 psi | 86% | 2949 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,492 psi | 89% | 3061 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,921 psi | 75% | 3091 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,621 psi | 86% | 2992 fps | 97.9% |
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 2495 | <<locked>> | 80% | 52,997 psi | 83% | 2844 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,459 psi | 79% | 2848 fps | 97.8% |
| Accurate 3100 | <<locked>> | 86% | 34,693 psi | 54% | 2602 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 50,241 psi | 79% | 2848 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,508 psi | 60% | 2710 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 80% | 47,152 psi | 74% | 2822 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 45,324 psi | 71% | 2864 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 96% | 49,487 psi | 78% | 2972 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,475 psi | 82% | 3048 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,732 psi | 75% | 2844 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,111 psi | 80% | 2920 fps | 100% |
| Alliant Reloder-16 | 61.7 gr | 80% | 37,289 psi | 58% | 2717 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,482 psi | 67% | 2851 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,962 psi | 70% | 2858 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 42,583 psi | 67% | 2851 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,456 psi | 43% | 2457 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 90% | 33,156 psi | 52% | 2641 fps | 95.1% |
| Alliant Reloder-26 | 69.8 gr | 82% | 31,459 psi | 49% | 2631 fps | 95.2% |
| Bofors RP15 | <<locked>> | 96% | 44,672 psi | 70% | 2894 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 48,341 psi | 76% | 2861 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 42,583 psi | 67% | 2851 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 42,337 psi | 66% | 2723 fps | 96.1% |
| Hodgdon H380 | <<locked>> | 80% | 48,675 psi | 76% | 2871 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 40,335 psi | 63% | 2756 fps | 96.1% |
| Hodgdon H4350 | <<locked>> | 80% | 43,308 psi | 68% | 2782 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 96% | 53,084 psi | 83% | 2982 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,967 psi | 81% | 2963 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,896 psi | 55% | 2608 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,011 psi | 83% | 2966 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 42,018 psi | 66% | 2910 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 39,392 psi | 62% | 2766 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,340 psi | 43% | 1680 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,737 psi | 84% | 2933 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,617 psi | 78% | 2858 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,880 psi | 81% | 2887 fps | 98.7% |
| IMR 4350 | <<locked>> | 82% | 40,495 psi | 63% | 2703 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,700 psi | 68% | 2756 fps | 97% |
| IMR 4831 | <<locked>> | 80% | 36,985 psi | 58% | 2661 fps | 97.9% |
| IMR 4895 | <<locked>> | 80% | 52,402 psi | 82% | 2949 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 51,401 psi | 81% | 2917 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 98% | 50,546 psi | 79% | 3009 fps | 95.8% |
| Lovex S060 | <<locked>> | 80% | 54,346 psi | 85% | 2900 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 50,038 psi | 78% | 2854 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,307 psi | 65% | 2703 fps | 97.7% |
| Lovex S070 | <<locked>> | 80% | 39,566 psi | 62% | 2684 fps | 96.1% |
| Lovex S071 | <<locked>> | 92% | 35,911 psi | 56% | 2628 fps | 95.8% |
| Norma 203B | <<locked>> | 80% | 50,459 psi | 79% | 2907 fps | 100% |
| Norma 204 | <<locked>> | 86% | 46,093 psi | 72% | 2858 fps | 95.8% |
| Norma MRP | 72.7 gr | 88% | 38,899 psi | 61% | 2795 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 38,218 psi | 60% | 2703 fps | 98% |
| Ramshot Big Game | <<locked>> | 80% | 50,850 psi | 80% | 2930 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 47,195 psi | 74% | 2953 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 36,985 psi | 58% | 2684 fps | 96% |
| Ramshot Magnum | <<locked>> | 96% | 42,090 psi | 66% | 2825 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,833 psi | 44% | 1719 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,472 psi | 76% | 2851 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,150 psi | 71% | 2907 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,218 psi | 60% | 2723 fps | 97.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,028 psi | 58% | 2730 fps | 97.2% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,841 psi | 61% | 2825 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 51,706 psi | 81% | 2867 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,469 psi | 71% | 2805 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,963 psi | 74% | 2844 fps | 95% |
| Rottweil R 905 | <<locked>> | 90% | 44,193 psi | 69% | 2841 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 42,337 psi | 66% | 2723 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,307 psi | 65% | 2703 fps | 97.7% |
| Shooters World Precision | <<locked>> | 80% | 50,038 psi | 78% | 2854 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,566 psi | 62% | 2684 fps | 96.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,514 psi | 73% | 2858 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,940 psi | 85% | 2943 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,485 psi | 73% | 2707 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,393 psi | 63% | 2648 fps | 96.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 43,816 psi | 69% | 2838 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 45,658 psi | 72% | 2802 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 51,445 psi | 81% | 2894 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 34,592 psi | 54% | 2654 fps | 99.6% |
| Somchem S385 | <<locked>> | 86% | 39,320 psi | 62% | 2707 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 51,953 psi | 81% | 2828 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,228 psi | 82% | 2844 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,642 psi | 68% | 2730 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,624 psi | 62% | 2703 fps | 98.3% |
| Vihtavuori N165 | <<locked>> | 92% | 41,321 psi | 65% | 2740 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 50,575 psi | 79% | 2838 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,131 psi | 61% | 2703 fps | 98% |
| Vihtavuori N555 | <<locked>> | 80% | 30,298 psi | 47% | 2536 fps | 96% |
| Vihtavuori N560 | <<locked>> | 96% | 51,924 psi | 81% | 3048 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,711 psi | 61% | 2671 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 40,480 psi | 63% | 2759 fps | 96.2% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,947 psi | 41% | 2487 fps | 95.5% |
| Winchester Supreme 780 | <<locked>> | 92% | 44,382 psi | 70% | 2808 fps | 95.5% |
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 97 powders for .300 Weath. Mag. loaded with the .308 | 165gr | Frontier BTSP. Alliant Reloder-26 delivers the highest muzzle velocity at 3,176 fps; across all powders the maximum-charge window runs from 1,877 fps to 3,176 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 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 165.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2217 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. Alliant Reloder-26, Norma MRP, Alliant Reloder-16 rank at the top here: for .300 Weath. Mag. with the .308 | 165gr | Frontier BTSP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, ADI AR 2225, Baschieri & Pellagri 109 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.