Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 180gr | Hornady InterLock RN bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Alliant Reloder-26 and Winchester StaBALL HD.
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% | 57,188 psi | 90% | 2927 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,969 psi | 86% | 2910 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 55,651 psi | 87% | 3015 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 82% | 56,159 psi | 88% | 2871 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,637 psi | 87% | 2959 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 96% | 57,145 psi | 90% | 3022 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,848 psi | 75% | 2851 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,612 psi | 67% | 2805 fps | 98.6% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 55,767 psi | 87% | 2956 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,522 psi | 90% | 2894 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,680 psi | 87% | 2963 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 56,811 psi | 89% | 2979 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,129 psi | 86% | 2946 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 96% | 56,971 psi | 89% | 3015 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 96% | 54,259 psi | 85% | 2933 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,548 psi | 84% | 2989 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 54,737 psi | 86% | 3025 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 55,898 psi | 88% | 2995 fps | 99.1% |
| Bofors RP30ᴾ | <<locked>> | 100% | 49,661 psi | 78% | 2920 fps | 97.7% |
| Bofors RP5 | <<locked>> | 96% | 56,971 psi | 89% | 3015 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 57,363 psi | 90% | 2907 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,663 psi | 83% | 2943 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 86% | 56,710 psi | 89% | 2963 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 55,608 psi | 87% | 2917 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 94% | 57,087 psi | 89% | 2959 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 94% | 55,970 psi | 88% | 2943 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,115 psi | 88% | 2887 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,649 psi | 83% | 3054 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 86% | 57,261 psi | 90% | 3002 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,057 psi | 58% | 1834 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,303 psi | 87% | 2890 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,332 psi | 87% | 2877 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 55,332 psi | 87% | 2900 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,578 psi | 86% | 2887 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 96% | 54,940 psi | 86% | 2999 fps | 98.3% |
| Lovex S065 | <<locked>> | 86% | 55,999 psi | 88% | 2877 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 57,493 psi | 90% | 2923 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,476 psi | 85% | 2887 fps | 100% |
| Norma 204 | <<locked>> | 88% | 56,405 psi | 88% | 2946 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 38,058 psi | 60% | 2723 fps | 96.5% |
| Norma MRP | <<locked>> | 94% | 56,913 psi | 89% | 3041 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 56,855 psi | 89% | 2943 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,448 psi | 87% | 3015 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 88% | 55,840 psi | 88% | 2949 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 53,751 psi | 84% | 2949 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,782 psi | 59% | 1873 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,492 psi | 89% | 2966 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,752 psi | 86% | 2930 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 56,985 psi | 89% | 3015 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,113 psi | 83% | 3051 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 82% | 55,085 psi | 86% | 2858 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 56,840 psi | 89% | 2930 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 92% | 54,549 psi | 85% | 2936 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 86% | 57,363 psi | 90% | 2907 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,999 psi | 88% | 2877 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 57,493 psi | 90% | 2923 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,536 psi | 89% | 2913 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,100 psi | 86% | 2733 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,172 psi | 86% | 2831 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 54,114 psi | 85% | 2930 fps | 99% |
| Somchem S355 | <<locked>> | 82% | 54,926 psi | 86% | 2854 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 54,897 psi | 86% | 2867 fps | 97.5% |
| Somchem S365 | <<locked>> | 90% | 57,217 psi | 90% | 2946 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 55,216 psi | 87% | 2910 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 84% | 56,072 psi | 88% | 2825 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,245 psi | 87% | 2884 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 54,636 psi | 86% | 2890 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 86% | 54,273 psi | 85% | 2887 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 56,811 psi | 89% | 2963 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 56,768 psi | 89% | 3035 fps | 98.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 56,434 psi | 88% | 3009 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,650 psi | 86% | 2841 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,710 psi | 89% | 2963 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 98% | 55,637 psi | 87% | 3071 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,998 psi | 86% | 2904 fps | 99% |
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% | 33,330 psi | 52% | 2474 fps | 96.2% |
| Accurate 4350 | <<locked>> | 80% | 44,744 psi | 70% | 2736 fps | 99.8% |
| Accurate MAGPRO | 80.8 gr | 90% | 48,312 psi | 76% | 2887 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 52,707 psi | 83% | 2818 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 39,900 psi | 63% | 2661 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 88% | 43,613 psi | 68% | 2769 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 96% | 41,800 psi | 66% | 2723 fps | 95% |
| ADI AR 2225 | <<locked>> | 94% | 35,085 psi | 55% | 2618 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 40,292 psi | 63% | 2664 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,940 psi | 85% | 2841 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,786 psi | 67% | 2743 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,443 psi | 77% | 2864 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,900 psi | 63% | 2657 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 84% | 37,971 psi | 60% | 2651 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,908 psi | 50% | 2500 fps | 99% |
| Alliant Reloder-25 | <<locked>> | 82% | 29,762 psi | 47% | 2457 fps | 95.1% |
| Alliant Reloder-26 | 72.7 gr | 80% | 34,824 psi | 55% | 2635 fps | 98.1% |
| Bofors RP15 | <<locked>> | 88% | 40,234 psi | 63% | 2703 fps | 95.8% |
| Bofors RP30 | <<locked>> | 94% | 40,437 psi | 63% | 2736 fps | 95.1% |
| Bofors RP5 | <<locked>> | 84% | 37,971 psi | 60% | 2651 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 47,514 psi | 74% | 2740 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 92% | 40,103 psi | 63% | 2690 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 46,470 psi | 73% | 2785 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 80% | 48,921 psi | 77% | 2802 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 88% | 46,514 psi | 73% | 2776 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 45,774 psi | 72% | 2759 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,437 psi | 63% | 2628 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 37,782 psi | 59% | 2726 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 45,716 psi | 72% | 2805 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,746 psi | 43% | 1637 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,018 psi | 67% | 2671 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,979 psi | 77% | 2769 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 42,685 psi | 67% | 2684 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 45,266 psi | 71% | 2717 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 90% | 44,802 psi | 70% | 2808 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 46,470 psi | 73% | 2717 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 44,889 psi | 70% | 2707 fps | 98.6% |
| Lovex S071 | <<locked>> | 82% | 30,603 psi | 48% | 2402 fps | 95% |
| Norma 204 | <<locked>> | 80% | 42,975 psi | 67% | 2703 fps | 96.4% |
| Norma 217 | <<locked>> | 98% | 35,607 psi | 56% | 2661 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 34,606 psi | 54% | 2595 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 43,990 psi | 69% | 2726 fps | 99.7% |
| Ramshot Grand | <<locked>> | 88% | 41,539 psi | 65% | 2749 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 42,757 psi | 67% | 2717 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 88% | 37,144 psi | 58% | 2628 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,297 psi | 44% | 1677 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,475 psi | 82% | 2910 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,585 psi | 70% | 2756 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,844 psi | 67% | 2769 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 34,519 psi | 54% | 2635 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 51,808 psi | 81% | 2808 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 44,164 psi | 69% | 2703 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 82% | 39,247 psi | 62% | 2641 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 47,514 psi | 74% | 2740 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,470 psi | 73% | 2717 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 44,889 psi | 70% | 2707 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,026 psi | 83% | 2861 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,822 psi | 81% | 2687 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,469 psi | 71% | 2664 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 38,914 psi | 61% | 2638 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 51,517 psi | 81% | 2802 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 45,005 psi | 71% | 2690 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 40,785 psi | 64% | 2680 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,202 psi | 58% | 2569 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 80% | 49,414 psi | 77% | 2726 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,339 psi | 71% | 2723 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 36,840 psi | 58% | 2552 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 44,788 psi | 70% | 2723 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 35,911 psi | 56% | 2582 fps | 98.9% |
| Vihtavuori N560 | <<locked>> | 88% | 46,093 psi | 72% | 2841 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 92% | 42,859 psi | 67% | 2762 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,338 psi | 69% | 2684 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,470 psi | 73% | 2785 fps | 98.8% |
| Winchester StaBALL HD | 69.8 gr | 80% | 28,369 psi | 44% | 2503 fps | 98.9% |
| Winchester Supreme 780 | <<locked>> | 84% | 38,986 psi | 61% | 2608 fps | 95.4% |
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 75 powders for .300 Weath. Mag. loaded with the .308 | 180gr | Hornady InterLock RN. Winchester StaBALL HD delivers the highest muzzle velocity at 3,071 fps; across all powders the maximum-charge window runs from 1,834 fps to 3,071 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 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 1:16.5 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. Accurate MAGPRO, Alliant Reloder-26, Winchester StaBALL HD rank at the top here: for .300 Weath. Mag. with the .308 | 180gr | Hornady InterLock RN 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.