Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 180gr | Barnes X S bullet and 76 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate MAGPRO and Ramshot Grand.
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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 57,638 psi | 90% | 2907 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,680 psi | 87% | 2894 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 55,288 psi | 87% | 2986 fps | 96.9% |
| ADI AR 2208 | <<locked>> | 82% | 56,202 psi | 88% | 2841 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,158 psi | 86% | 2927 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 96% | 56,724 psi | 89% | 2986 fps | 98.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,761 psi | 75% | 2818 fps | 96.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,830 psi | 67% | 2785 fps | 98.3% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 55,492 psi | 87% | 2927 fps | 98.8% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 55,492 psi | 87% | 2927 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,682 psi | 90% | 2871 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,303 psi | 87% | 2933 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 56,521 psi | 89% | 2953 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 54,868 psi | 86% | 2917 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 96% | 56,724 psi | 89% | 2989 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 57,609 psi | 90% | 2963 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,345 psi | 84% | 2966 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 54,215 psi | 85% | 2999 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 55,695 psi | 87% | 2969 fps | 98.9% |
| Bofors RP30ᴾ | <<locked>> | 100% | 49,559 psi | 78% | 2897 fps | 97.4% |
| Bofors RP5 | <<locked>> | 96% | 56,724 psi | 89% | 2989 fps | 99.1% |
| Bofors RP7 | <<locked>> | 86% | 57,725 psi | 90% | 2881 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,489 psi | 82% | 2910 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 86% | 56,449 psi | 88% | 2933 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 84% | 55,622 psi | 87% | 2887 fps | 99% |
| Hodgdon H4831 | <<locked>> | 94% | 56,579 psi | 89% | 2923 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 55,506 psi | 87% | 2907 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,970 psi | 88% | 2861 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,214 psi | 82% | 3022 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 86% | 56,710 psi | 89% | 2969 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,202 psi | 58% | 1808 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,434 psi | 87% | 2864 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,463 psi | 87% | 2851 fps | 99.6% |
| IMR 4831 | <<locked>> | 88% | 55,550 psi | 87% | 2877 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 57,740 psi | 90% | 2907 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 96% | 54,549 psi | 85% | 2963 fps | 97.8% |
| Lovex S065 | <<locked>> | 86% | 56,492 psi | 89% | 2854 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 54,607 psi | 86% | 2848 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,201 psi | 87% | 2867 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 56,086 psi | 88% | 2913 fps | 98.8% |
| Norma 217ᴾ | <<locked>> | 100% | 38,841 psi | 61% | 2720 fps | 96.4% |
| Norma MRP | <<locked>> | 94% | 56,478 psi | 89% | 3012 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 57,058 psi | 89% | 2920 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,056 psi | 86% | 2982 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 88% | 55,579 psi | 87% | 2920 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 57,145 psi | 90% | 2979 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,029 psi | 60% | 1850 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,086 psi | 88% | 2943 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,984 psi | 86% | 2907 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 56,391 psi | 88% | 2986 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 52,866 psi | 83% | 3022 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 82% | 56,028 psi | 88% | 2841 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 56,695 psi | 89% | 2897 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 92% | 54,621 psi | 86% | 2910 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 86% | 57,725 psi | 90% | 2881 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,492 psi | 89% | 2854 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 54,607 psi | 86% | 2848 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,681 psi | 89% | 2890 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,303 psi | 87% | 2710 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,666 psi | 87% | 2805 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 57,696 psi | 90% | 2959 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 55,550 psi | 87% | 2835 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 54,868 psi | 86% | 2835 fps | 97.1% |
| Somchem S365 | <<locked>> | 90% | 57,319 psi | 90% | 2927 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 55,317 psi | 87% | 2887 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 84% | 56,318 psi | 88% | 2802 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,347 psi | 87% | 2861 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 54,505 psi | 85% | 2861 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 86% | 54,534 psi | 85% | 2864 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 57,087 psi | 89% | 2946 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 56,318 psi | 88% | 2999 fps | 97.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 56,376 psi | 88% | 2982 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,462 psi | 85% | 2818 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,695 psi | 89% | 2936 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 54,607 psi | 86% | 3048 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,795 psi | 86% | 2874 fps | 98.7% |
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>> | 80% | 35,027 psi | 55% | 2487 fps | 96.6% |
| Accurate 4350 | <<locked>> | 80% | 45,948 psi | 72% | 2730 fps | 99.8% |
| Accurate MAGPRO | 76.2 gr | 90% | 48,544 psi | 76% | 2864 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 52,910 psi | 83% | 2792 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 40,422 psi | 63% | 2644 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 88% | 43,888 psi | 69% | 2746 fps | 95% |
| ADI AR 2217 | <<locked>> | 98% | 44,976 psi | 70% | 2762 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 94% | 35,911 psi | 56% | 2612 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 40,886 psi | 64% | 2651 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 40,886 psi | 64% | 2651 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,317 psi | 85% | 2818 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,192 psi | 68% | 2723 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,545 psi | 78% | 2844 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 40,538 psi | 64% | 2644 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 84% | 38,783 psi | 61% | 2644 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,083 psi | 52% | 2507 fps | 99.1% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,980 psi | 49% | 2467 fps | 95.4% |
| Alliant Reloder-26 | 68.5 gr | 80% | 35,868 psi | 56% | 2641 fps | 98.3% |
| Bofors RP15 | <<locked>> | 88% | 40,930 psi | 64% | 2694 fps | 95.7% |
| Bofors RP30 | <<locked>> | 94% | 40,959 psi | 64% | 2726 fps | 95% |
| Bofors RP5 | <<locked>> | 84% | 38,783 psi | 61% | 2644 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 48,298 psi | 76% | 2723 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 94% | 43,352 psi | 68% | 2730 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 46,746 psi | 73% | 2762 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 80% | 49,255 psi | 77% | 2779 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 88% | 46,833 psi | 73% | 2753 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 88% | 45,890 psi | 72% | 2736 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,176 psi | 65% | 2618 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 38,406 psi | 60% | 2713 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 45,948 psi | 72% | 2785 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,079 psi | 44% | 1617 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,569 psi | 68% | 2651 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,182 psi | 77% | 2743 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 43,569 psi | 68% | 2674 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 45,571 psi | 71% | 2694 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 90% | 45,078 psi | 71% | 2785 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 47,384 psi | 74% | 2703 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 45,803 psi | 72% | 2694 fps | 98.6% |
| Lovex S071 | <<locked>> | 82% | 32,445 psi | 51% | 2421 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 43,526 psi | 68% | 2687 fps | 96.2% |
| Norma 217 | <<locked>> | 98% | 36,593 psi | 57% | 2661 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 35,694 psi | 56% | 2598 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 44,657 psi | 70% | 2713 fps | 99.7% |
| Ramshot Grand | 74.1 gr | 90% | 44,875 psi | 70% | 2792 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 43,395 psi | 68% | 2703 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 88% | 37,869 psi | 59% | 2618 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,718 psi | 45% | 1657 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,330 psi | 82% | 2887 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,295 psi | 71% | 2743 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,163 psi | 68% | 2753 fps | 99.4% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,520 psi | 56% | 2631 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 52,663 psi | 83% | 2792 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 44,483 psi | 70% | 2677 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 82% | 39,987 psi | 63% | 2631 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 48,298 psi | 76% | 2723 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,384 psi | 74% | 2703 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 45,803 psi | 72% | 2694 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,316 psi | 84% | 2841 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,185 psi | 82% | 2664 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,340 psi | 73% | 2648 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 39,639 psi | 62% | 2628 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 52,257 psi | 82% | 2782 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 48,385 psi | 76% | 2723 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 41,553 psi | 65% | 2674 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,406 psi | 60% | 2566 fps | 96% |
| Vihtavuori N150 | <<locked>> | 80% | 50,038 psi | 78% | 2710 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,934 psi | 72% | 2703 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 37,681 psi | 59% | 2546 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 45,513 psi | 71% | 2710 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 37,144 psi | 58% | 2585 fps | 99.1% |
| Vihtavuori N560 | <<locked>> | 88% | 46,282 psi | 73% | 2822 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 94% | 46,528 psi | 73% | 2808 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,657 psi | 70% | 2664 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,934 psi | 74% | 2769 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 29,805 psi | 47% | 2526 fps | 99.3% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,697 psi | 62% | 2595 fps | 95.3% |
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 76 powders for .300 Weath. Mag. loaded with the .308 | 180gr | Barnes X S. Winchester StaBALL HD delivers the highest muzzle velocity at 3,048 fps; across all powders the maximum-charge window runs from 1,808 fps to 3,048 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 180.0 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, Accurate MAGPRO, Ramshot Grand rank at the top here: for .300 Weath. Mag. with the .308 | 180gr | Barnes X S 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.