Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 165gr | Barnes X BT bullet and 77 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 ReloadSwiss RS 70.
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 3100 | <<locked>> | 96% | 54,563 psi | 86% | 2976 fps | 99.6% |
| Accurate 4350 | <<locked>> | 88% | 56,057 psi | 88% | 3022 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 55,854 psi | 88% | 3107 fps | 96.1% |
| ADI AR 2208 | <<locked>> | 84% | 57,116 psi | 90% | 2976 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 55,956 psi | 88% | 3051 fps | 98.2% |
| ADI AR 2213 | <<locked>> | 98% | 57,348 psi | 90% | 3107 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,538 psi | 64% | 2825 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,172 psi | 86% | 2956 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 55,709 psi | 87% | 3064 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,174 psi | 90% | 3087 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,535 psi | 87% | 3041 fps | 98.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,029 psi | 89% | 3107 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,317 psi | 85% | 3041 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,328 psi | 79% | 3028 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,433 psi | 85% | 3127 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,738 psi | 87% | 3087 fps | 98.3% |
| Bofors RP3 | <<locked>> | 82% | 56,478 psi | 89% | 2976 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 57,029 psi | 89% | 3107 fps | 98.6% |
| Bofors RP7 | <<locked>> | 86% | 55,172 psi | 86% | 2956 fps | 98.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,661 psi | 78% | 2959 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 82% | 56,289 psi | 88% | 2989 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,261 psi | 90% | 3064 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 86% | 56,536 psi | 89% | 3015 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 96% | 57,290 psi | 90% | 3045 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,202 psi | 88% | 3025 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,362 psi | 88% | 2989 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,211 psi | 77% | 3068 fps | 97.9% |
| Hodgdon Superformance | <<locked>> | 88% | 57,392 psi | 90% | 3097 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,057 psi | 58% | 1886 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,594 psi | 89% | 2959 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,985 psi | 88% | 2986 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,376 psi | 88% | 2979 fps | 99.3% |
| IMR 4831 | <<locked>> | 90% | 56,202 psi | 88% | 3005 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,288 psi | 87% | 2976 fps | 96.5% |
| IMR 7828 SSC | <<locked>> | 98% | 54,824 psi | 86% | 3077 fps | 97% |
| Lovex S062 | <<locked>> | 82% | 57,508 psi | 90% | 2959 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,246 psi | 90% | 2982 fps | 99.9% |
| Lovex S070 | <<locked>> | 88% | 55,419 psi | 87% | 2976 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,069 psi | 82% | 2936 fps | 99.4% |
| Norma 204 | <<locked>> | 90% | 56,927 psi | 89% | 3045 fps | 98.2% |
| Norma MRP | <<locked>> | 96% | 56,594 psi | 89% | 3133 fps | 99.4% |
| Norma URP | <<locked>> | 90% | 57,479 psi | 90% | 3048 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,390 psi | 87% | 3097 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 90% | 56,275 psi | 88% | 3048 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,824 psi | 84% | 3035 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,811 psi | 59% | 1932 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,782 psi | 87% | 2966 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,478 psi | 89% | 3077 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,535 psi | 87% | 3035 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,188 psi | 90% | 3117 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,734 psi | 78% | 3068 fps | 99% |
| Rottweil R 903 | <<locked>> | 84% | 56,782 psi | 89% | 2976 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,493 psi | 90% | 3022 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 94% | 55,071 psi | 86% | 3031 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 86% | 55,172 psi | 86% | 2956 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,246 psi | 90% | 2982 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 57,508 psi | 90% | 2959 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,419 psi | 87% | 2976 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,421 psi | 90% | 3025 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,376 psi | 88% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,710 psi | 89% | 2933 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,607 psi | 86% | 3025 fps | 98.2% |
| Somchem S355 | <<locked>> | 84% | 56,202 psi | 88% | 2966 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,782 psi | 87% | 2956 fps | 96.4% |
| Somchem S365 | <<locked>> | 92% | 57,421 psi | 90% | 3054 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,912 psi | 88% | 3009 fps | 98.9% |
| Vihtavuori N150 | <<locked>> | 86% | 57,377 psi | 90% | 2936 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,898 psi | 88% | 2989 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,013 psi | 86% | 2979 fps | 98.6% |
| Vihtavuori N550 | <<locked>> | 88% | 55,405 psi | 87% | 2995 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 57,246 psi | 90% | 3071 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 56,507 psi | 89% | 3120 fps | 96.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,852 psi | 83% | 3038 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,172 psi | 86% | 2946 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,508 psi | 90% | 3068 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 53,795 psi | 84% | 3169 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,390 psi | 87% | 2995 fps | 98.1% |
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 3100 | <<locked>> | 82% | 35,114 psi | 55% | 2592 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 43,511 psi | 68% | 2799 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 94% | 52,040 psi | 82% | 3038 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 50,821 psi | 80% | 2874 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 43,497 psi | 68% | 2815 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 94% | 50,401 psi | 79% | 2982 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 98% | 38,232 psi | 60% | 2762 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,938 psi | 81% | 2904 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,046 psi | 64% | 2792 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,673 psi | 73% | 2917 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 43,395 psi | 68% | 2812 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 90% | 44,092 psi | 69% | 2871 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,328 psi | 49% | 2559 fps | 97.8% |
| Alliant Reloder-25 | <<locked>> | 86% | 32,996 psi | 52% | 2621 fps | 95.2% |
| Alliant Reloder-26 | 69.4 gr | 80% | 33,634 psi | 53% | 2680 fps | 96.5% |
| Bofors RP15 | <<locked>> | 92% | 43,569 psi | 68% | 2858 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 53,185 psi | 83% | 2927 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 44,092 psi | 69% | 2871 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 46,267 psi | 73% | 2792 fps | 97.3% |
| Hodgdon H1000 | <<locked>> | 98% | 46,586 psi | 73% | 2897 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 52,982 psi | 83% | 2933 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 44,570 psi | 70% | 2831 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 80% | 47,007 psi | 74% | 2844 fps | 96.7% |
| Hodgdon H4831 | <<locked>> | 92% | 50,299 psi | 79% | 2927 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 52,794 psi | 83% | 2969 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,015 psi | 61% | 2684 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 94% | 41,075 psi | 64% | 2874 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 43,453 psi | 68% | 2844 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,905 psi | 44% | 1690 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,447 psi | 84% | 2910 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,553 psi | 65% | 2713 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,181 psi | 74% | 2815 fps | 97.9% |
| IMR 4831 | <<locked>> | 80% | 41,234 psi | 65% | 2736 fps | 98.9% |
| IMR 4955 Enduron | <<locked>> | 90% | 48,892 psi | 77% | 2861 fps | 95% |
| IMR 7828 SSC | <<locked>> | 94% | 48,399 psi | 76% | 2956 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 54,143 psi | 85% | 2907 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 45,368 psi | 71% | 2772 fps | 98.6% |
| Lovex S070 | <<locked>> | 80% | 43,729 psi | 69% | 2759 fps | 97.4% |
| Lovex S071 | <<locked>> | 86% | 34,316 psi | 54% | 2569 fps | 95.3% |
| Norma 204 | <<locked>> | 82% | 43,918 psi | 69% | 2802 fps | 95.3% |
| Norma MRP | 70.7 gr | 84% | 38,145 psi | 60% | 2762 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 42,380 psi | 66% | 2776 fps | 99% |
| Ramshot Grand | <<locked>> | 94% | 48,443 psi | 76% | 2969 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 41,089 psi | 64% | 2762 fps | 97.4% |
| Ramshot Magnum | <<locked>> | 92% | 40,872 psi | 64% | 2782 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,500 psi | 45% | 1729 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,576 psi | 82% | 2913 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,371 psi | 77% | 2969 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,902 psi | 67% | 2808 fps | 98.9% |
| ReloadSwiss RS 70 | 68.8 gr | 80% | 41,002 psi | 64% | 2812 fps | 98.4% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 38,101 psi | 60% | 2792 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 50,241 psi | 79% | 2871 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 47,848 psi | 75% | 2851 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 86% | 42,815 psi | 67% | 2799 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 46,267 psi | 73% | 2792 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,368 psi | 71% | 2772 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 54,143 psi | 85% | 2907 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,729 psi | 69% | 2759 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,734 psi | 80% | 2920 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,183 psi | 79% | 2753 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,411 psi | 70% | 2717 fps | 97.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 42,511 psi | 67% | 2795 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 50,009 psi | 78% | 2864 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 52,417 psi | 82% | 2900 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 39,059 psi | 61% | 2740 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 38,653 psi | 61% | 2674 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 47,790 psi | 75% | 2789 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,700 psi | 68% | 2772 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 88% | 40,248 psi | 63% | 2703 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 43,323 psi | 68% | 2776 fps | 99% |
| Vihtavuori N555 | <<locked>> | 80% | 34,954 psi | 55% | 2641 fps | 97.9% |
| Vihtavuori N560 | <<locked>> | 92% | 49,734 psi | 78% | 2995 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 98% | 49,487 psi | 78% | 2976 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,482 psi | 67% | 2736 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,570 psi | 70% | 2831 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 28,137 psi | 44% | 2552 fps | 97.4% |
| Winchester Supreme 780 | <<locked>> | 88% | 42,612 psi | 67% | 2759 fps | 95.1% |
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 83 powders for .300 Weath. Mag. loaded with the .308 | 165gr | Barnes X BT. Winchester StaBALL HD delivers the highest muzzle velocity at 3,169 fps; across all powders the maximum-charge window runs from 1,886 fps to 3,169 fps. ADI AR 2217 gives the best case fill at 100 %, and 83 of the 83 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. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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, ReloadSwiss RS 70 rank at the top here: for .300 Weath. Mag. with the .308 | 165gr | Barnes X BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, Baschieri & Pellagri 109, Norma 217 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.