Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 165gr | 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 Alliant Reloder-26, Norma MRP and Hodgdon H414.
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% | 55,608 psi | 87% | 2887 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,145 psi | 90% | 2966 fps | 98.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,535 psi | 87% | 3009 fps | 99.7% |
| Accurate 4064 | <<locked>> | 84% | 55,999 psi | 88% | 2943 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 57,464 psi | 90% | 3061 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 56,536 psi | 89% | 2986 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,926 psi | 86% | 3051 fps | 98% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,333 psi | 88% | 3107 fps | 97.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,173 psi | 88% | 3110 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,392 psi | 90% | 3009 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 57,566 psi | 90% | 3031 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,766 psi | 86% | 3068 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,173 psi | 88% | 3091 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,259 psi | 85% | 3035 fps | 98% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,361 psi | 87% | 3097 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,272 psi | 82% | 3025 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,266 psi | 71% | 2943 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,666 psi | 89% | 3176 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,705 psi | 79% | 3015 fps | 97.3% |
| Bofors RP3 | <<locked>> | 84% | 54,433 psi | 85% | 2966 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,361 psi | 87% | 3097 fps | 98.3% |
| Bofors RP7 | <<locked>> | 90% | 57,566 psi | 90% | 3012 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 84% | 55,013 psi | 86% | 2989 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 56,072 psi | 88% | 3061 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 88% | 55,753 psi | 87% | 3018 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 98% | 56,492 psi | 89% | 3048 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,332 psi | 87% | 3028 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,071 psi | 86% | 2989 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,304 psi | 88% | 3025 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,324 psi | 69% | 2976 fps | 96.4% |
| Hodgdon Superformance | <<locked>> | 90% | 56,695 psi | 89% | 3100 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,390 psi | 57% | 1883 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,942 psi | 89% | 2989 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,825 psi | 87% | 2966 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,882 psi | 86% | 2946 fps | 99.1% |
| IMR 4350 | <<locked>> | 92% | 55,158 psi | 86% | 2989 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,840 psi | 88% | 2986 fps | 99.2% |
| IMR 4831 | <<locked>> | 92% | 54,389 psi | 85% | 2999 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,390 psi | 87% | 3005 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,317 psi | 85% | 2976 fps | 96.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,722 psi | 84% | 3071 fps | 96.7% |
| Lovex S060 | <<locked>> | 82% | 57,334 psi | 90% | 2953 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,072 psi | 88% | 2959 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,869 psi | 88% | 2979 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 57,116 psi | 90% | 3022 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,847 psi | 72% | 2848 fps | 98.5% |
| Norma 201 | <<locked>> | 82% | 57,290 psi | 90% | 2972 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,797 psi | 89% | 3015 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,028 psi | 88% | 3041 fps | 98.1% |
| Norma MRP | <<locked>> | 98% | 55,172 psi | 86% | 3127 fps | 99.3% |
| Norma URP | <<locked>> | 92% | 56,144 psi | 88% | 3045 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,114 psi | 85% | 2986 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,331 psi | 85% | 3094 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 92% | 54,998 psi | 86% | 3045 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,312 psi | 76% | 2956 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,999 psi | 58% | 1926 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,839 psi | 86% | 2972 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,535 psi | 87% | 3081 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 57,711 psi | 90% | 3087 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,304 psi | 88% | 3120 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,425 psi | 70% | 2969 fps | 97.6% |
| Rottweil R 902 | <<locked>> | 82% | 54,360 psi | 85% | 2920 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,723 psi | 86% | 2966 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,724 psi | 89% | 3025 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 98% | 57,392 psi | 90% | 3084 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 90% | 57,566 psi | 90% | 3012 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,869 psi | 88% | 2979 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 56,072 psi | 88% | 2959 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,116 psi | 90% | 3022 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,579 psi | 89% | 3031 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,159 psi | 90% | 2999 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,767 psi | 87% | 2854 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,506 psi | 87% | 2933 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,898 psi | 89% | 3081 fps | 98.5% |
| Somchem S335 | <<locked>> | 82% | 57,740 psi | 90% | 2894 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 54,607 psi | 86% | 2959 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,810 psi | 86% | 2956 fps | 96.1% |
| Somchem S365 | <<locked>> | 94% | 55,651 psi | 87% | 3048 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,128 psi | 85% | 2999 fps | 98.7% |
| Vihtavuori N135 | <<locked>> | 82% | 54,839 psi | 86% | 2877 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,230 psi | 87% | 2894 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,130 psi | 88% | 2936 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,636 psi | 86% | 2986 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,606 psi | 84% | 2972 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 84% | 57,014 psi | 89% | 2940 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 57,348 psi | 90% | 3045 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,636 psi | 86% | 3051 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,376 psi | 87% | 3117 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,346 psi | 85% | 2949 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,289 psi | 88% | 3064 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,805 psi | 75% | 3091 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 57,595 psi | 90% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,462 psi | 85% | 2995 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% | 51,982 psi | 81% | 2838 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,096 psi | 79% | 2851 fps | 97.8% |
| Accurate 3100 | <<locked>> | 86% | 33,895 psi | 53% | 2585 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 49,284 psi | 77% | 2844 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,710 psi | 59% | 2697 fps | 98% |
| ADI AR 2208 | <<locked>> | 80% | 46,789 psi | 73% | 2822 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 44,918 psi | 70% | 2864 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 96% | 49,197 psi | 77% | 2972 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,272 psi | 82% | 3051 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,224 psi | 74% | 2844 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,560 psi | 79% | 2920 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,825 psi | 58% | 2713 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,959 psi | 66% | 2844 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,556 psi | 70% | 2858 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 42,018 psi | 66% | 2841 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,803 psi | 42% | 2444 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 92% | 34,780 psi | 55% | 2694 fps | 96% |
| Alliant Reloder-26 | 72.6 gr | 84% | 33,243 psi | 52% | 2694 fps | 96.2% |
| Bofors RP15 | <<locked>> | 96% | 44,295 psi | 69% | 2890 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 47,630 psi | 75% | 2858 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 42,018 psi | 66% | 2841 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 41,771 psi | 65% | 2720 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 48,022 psi | 75% | 2867 fps | 99.5% |
| Hodgdon H414 | 66 gr | 80% | 39,929 psi | 63% | 2753 fps | 96.1% |
| Hodgdon H4350 | <<locked>> | 80% | 42,844 psi | 67% | 2776 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 96% | 52,779 psi | 83% | 2982 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,677 psi | 81% | 2966 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,345 psi | 54% | 2598 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,765 psi | 83% | 2969 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,510 psi | 65% | 2907 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 38,899 psi | 61% | 2759 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,166 psi | 43% | 1683 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,388 psi | 84% | 2933 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,211 psi | 77% | 2858 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,488 psi | 81% | 2887 fps | 98.7% |
| IMR 4350 | <<locked>> | 82% | 39,987 psi | 63% | 2700 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,294 psi | 68% | 2756 fps | 96.9% |
| IMR 4831 | <<locked>> | 80% | 36,347 psi | 57% | 2651 fps | 97.7% |
| IMR 4895 | <<locked>> | 80% | 51,895 psi | 81% | 2949 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 50,966 psi | 80% | 2917 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 98% | 50,183 psi | 79% | 3009 fps | 95.8% |
| Lovex S060 | <<locked>> | 80% | 53,824 psi | 84% | 2897 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,284 psi | 77% | 2851 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,698 psi | 64% | 2700 fps | 97.6% |
| Lovex S070 | <<locked>> | 80% | 38,899 psi | 61% | 2677 fps | 96% |
| Lovex S071 | <<locked>> | 92% | 35,099 psi | 55% | 2618 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 53,708 psi | 84% | 2917 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,922 psi | 78% | 2904 fps | 100% |
| Norma 204 | <<locked>> | 86% | 45,643 psi | 72% | 2858 fps | 95.8% |
| Norma MRP | 73.8 gr | 88% | 38,479 psi | 60% | 2792 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 37,637 psi | 59% | 2697 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 80% | 50,502 psi | 79% | 2927 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 46,775 psi | 73% | 2949 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 36,535 psi | 57% | 2680 fps | 95.9% |
| Ramshot Magnum | <<locked>> | 96% | 41,524 psi | 65% | 2815 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,615 psi | 43% | 1722 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,124 psi | 75% | 2854 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,614 psi | 70% | 2904 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,681 psi | 59% | 2717 fps | 97.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,579 psi | 57% | 2726 fps | 97.1% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,363 psi | 60% | 2818 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 51,140 psi | 80% | 2867 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,759 psi | 70% | 2799 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 49,734 psi | 78% | 2904 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 90% | 43,685 psi | 68% | 2838 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 41,771 psi | 65% | 2720 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,698 psi | 64% | 2700 fps | 97.6% |
| Shooters World Precision | <<locked>> | 80% | 49,284 psi | 77% | 2851 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,899 psi | 61% | 2677 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,195 psi | 72% | 2858 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,693 psi | 84% | 2946 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,122 psi | 72% | 2710 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,784 psi | 62% | 2641 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 43,294 psi | 68% | 2831 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 54,259 psi | 85% | 2844 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 45,078 psi | 71% | 2799 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 51,227 psi | 80% | 2894 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 33,982 psi | 53% | 2648 fps | 99.5% |
| Somchem S385 | <<locked>> | 86% | 38,711 psi | 61% | 2700 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 51,517 psi | 81% | 2828 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,793 psi | 81% | 2844 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,105 psi | 68% | 2726 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,073 psi | 61% | 2697 fps | 98.2% |
| Vihtavuori N165 | <<locked>> | 92% | 40,770 psi | 64% | 2733 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 50,009 psi | 78% | 2835 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,508 psi | 60% | 2697 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 29,530 psi | 46% | 2520 fps | 95.6% |
| Vihtavuori N560 | <<locked>> | 96% | 51,576 psi | 81% | 3048 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,276 psi | 60% | 2667 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 39,929 psi | 63% | 2753 fps | 96.1% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,992 psi | 42% | 2533 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,824 psi | 84% | 2953 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,830 psi | 69% | 2802 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 93 powders for .300 Weath. Mag. loaded with the .308 | 165gr | Barnes MRX BT. Alliant Reloder-26 delivers the highest muzzle velocity at 3,176 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,176 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 (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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, Hodgdon H414 rank at the top here: for .300 Weath. Mag. with the .308 | 165gr | 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.