Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 185gr | Berger JUG bullet and 78 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Accurate MAGPRO.
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% | 55,013 psi | 86% | 2851 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 56,724 psi | 89% | 2890 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 57,479 psi | 90% | 3002 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 82% | 54,781 psi | 86% | 2802 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,421 psi | 90% | 2940 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 96% | 55,172 psi | 86% | 2943 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,122 psi | 72% | 2772 fps | 96.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,915 psi | 64% | 2730 fps | 98.1% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 57,450 psi | 90% | 2933 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,825 psi | 87% | 2822 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,406 psi | 90% | 2943 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,969 psi | 86% | 2907 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,826 psi | 89% | 2930 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,911 psi | 86% | 2940 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,738 psi | 87% | 2913 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,488 psi | 81% | 2913 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,289 psi | 88% | 3005 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,522 psi | 90% | 2979 fps | 99.3% |
| Bofors RP3 | <<locked>> | 82% | 56,855 psi | 89% | 2841 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,369 psi | 74% | 2841 fps | 97.3% |
| Bofors RP5 | <<locked>> | 96% | 54,911 psi | 86% | 2940 fps | 99.1% |
| Bofors RP7 | <<locked>> | 86% | 55,811 psi | 87% | 2835 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,691 psi | 79% | 2861 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 82% | 56,927 psi | 89% | 2861 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,824 psi | 86% | 2887 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 86% | 57,595 psi | 90% | 2900 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 94% | 55,085 psi | 86% | 2881 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 53,925 psi | 85% | 2861 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,288 psi | 85% | 2818 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,488 psi | 79% | 2969 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 86% | 55,085 psi | 86% | 2923 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,840 psi | 58% | 1785 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,667 psi | 90% | 2835 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,246 psi | 90% | 2874 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,421 psi | 90% | 2861 fps | 99.8% |
| IMR 4831 | <<locked>> | 90% | 56,898 psi | 89% | 2877 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,362 psi | 88% | 2867 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 98% | 56,623 psi | 89% | 2979 fps | 98.5% |
| Lovex S065 | <<locked>> | 86% | 54,433 psi | 85% | 2805 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,854 psi | 88% | 2851 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,518 psi | 82% | 2815 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 54,549 psi | 85% | 2874 fps | 98.8% |
| Norma MRP | <<locked>> | 94% | 54,534 psi | 85% | 2963 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 55,071 psi | 86% | 2871 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,406 psi | 90% | 3002 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 90% | 57,711 psi | 90% | 2933 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,463 psi | 87% | 2933 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,768 psi | 59% | 1831 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,579 psi | 89% | 2844 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,346 psi | 85% | 2894 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,681 psi | 89% | 2913 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,853 psi | 86% | 2940 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,763 psi | 80% | 2966 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 84% | 57,188 psi | 90% | 2841 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,259 psi | 87% | 2858 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 94% | 56,217 psi | 88% | 2917 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 86% | 55,811 psi | 87% | 2835 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,433 psi | 85% | 2805 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,854 psi | 88% | 2851 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,882 psi | 86% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,116 psi | 90% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,377 psi | 90% | 2815 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,767 psi | 87% | 2913 fps | 99.2% |
| Somchem S355 | <<locked>> | 84% | 56,710 psi | 89% | 2831 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,739 psi | 89% | 2848 fps | 97.8% |
| Somchem S365 | <<locked>> | 90% | 55,187 psi | 86% | 2874 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,811 psi | 89% | 2890 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 84% | 54,578 psi | 86% | 2759 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,043 psi | 89% | 2864 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,260 psi | 88% | 2871 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 88% | 56,072 psi | 88% | 2867 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,520 psi | 85% | 2887 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,534 psi | 85% | 2953 fps | 97.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,012 psi | 85% | 2927 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,637 psi | 89% | 2825 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,042 psi | 86% | 2890 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 56,739 psi | 89% | 3048 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,985 psi | 89% | 2890 fps | 99.2% |
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% | 32,126 psi | 50% | 2411 fps | 95.8% |
| Accurate 4350 | <<locked>> | 80% | 43,250 psi | 68% | 2667 fps | 99.7% |
| Accurate MAGPRO | 76.8 gr | 90% | 46,514 psi | 73% | 2808 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 51,416 psi | 81% | 2749 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 38,624 psi | 61% | 2592 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 90% | 45,034 psi | 71% | 2756 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 98% | 43,149 psi | 68% | 2710 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 94% | 33,692 psi | 53% | 2543 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 38,856 psi | 61% | 2592 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,388 psi | 82% | 2772 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,466 psi | 65% | 2674 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,659 psi | 75% | 2792 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 38,638 psi | 61% | 2589 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 86% | 39,117 psi | 61% | 2641 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,835 psi | 48% | 2438 fps | 98.8% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,647 psi | 48% | 2451 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,359 psi | 52% | 2562 fps | 97.8% |
| Bofors RP15 | <<locked>> | 88% | 38,754 psi | 61% | 2631 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 53,316 psi | 84% | 2789 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 41,423 psi | 65% | 2723 fps | 95.6% |
| Bofors RP5 | <<locked>> | 86% | 39,117 psi | 61% | 2641 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 46,325 psi | 73% | 2674 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 94% | 41,452 psi | 65% | 2680 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 53,388 psi | 84% | 2808 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,991 psi | 71% | 2717 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 80% | 47,645 psi | 75% | 2733 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 88% | 44,976 psi | 70% | 2703 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 47,268 psi | 74% | 2749 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,102 psi | 61% | 2562 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 38,783 psi | 61% | 2713 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 44,193 psi | 69% | 2733 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,586 psi | 43% | 1594 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 54,114 psi | 85% | 2782 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,756 psi | 65% | 2602 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,645 psi | 75% | 2700 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 41,292 psi | 65% | 2618 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 43,874 psi | 69% | 2644 fps | 95% |
| IMR 7828 SSC | <<locked>> | 90% | 43,149 psi | 68% | 2730 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 45,266 psi | 71% | 2651 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 43,584 psi | 68% | 2638 fps | 98.4% |
| Lovex S071 | <<locked>> | 84% | 31,415 psi | 49% | 2392 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 41,640 psi | 65% | 2638 fps | 96.1% |
| Norma MRP | 68.7 gr | 82% | 35,839 psi | 56% | 2595 fps | 96% |
| Norma URP | <<locked>> | 80% | 42,583 psi | 67% | 2657 fps | 99.6% |
| Ramshot Grand | <<locked>> | 90% | 42,960 psi | 67% | 2740 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 41,394 psi | 65% | 2648 fps | 98.5% |
| Ramshot Magnum | <<locked>> | 88% | 35,621 psi | 56% | 2552 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,152 psi | 44% | 1634 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,142 psi | 83% | 2792 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,575 psi | 79% | 2838 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,149 psi | 68% | 2687 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,394 psi | 65% | 2700 fps | 99.4% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 35,592 psi | 56% | 2628 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 50,227 psi | 79% | 2736 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 42,685 psi | 67% | 2631 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 82% | 37,884 psi | 59% | 2572 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 46,325 psi | 73% | 2674 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,266 psi | 71% | 2651 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 43,584 psi | 68% | 2638 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,488 psi | 81% | 2795 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,589 psi | 79% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,208 psi | 69% | 2595 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 37,536 psi | 59% | 2566 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 50,169 psi | 79% | 2733 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 46,630 psi | 73% | 2680 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 39,247 psi | 62% | 2612 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,013 psi | 56% | 2500 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 47,979 psi | 75% | 2661 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,976 psi | 69% | 2654 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 86% | 37,956 psi | 59% | 2539 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 43,410 psi | 68% | 2654 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 34,490 psi | 54% | 2513 fps | 98.7% |
| Vihtavuori N560 | 73.7 gr | 88% | 44,396 psi | 70% | 2769 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 94% | 44,106 psi | 69% | 2749 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,989 psi | 67% | 2618 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,991 psi | 71% | 2717 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,325 psi | 43% | 2434 fps | 98.6% |
| Winchester Supreme 780 | <<locked>> | 86% | 40,364 psi | 63% | 2598 fps | 95.9% |
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 78 powders for .300 Weath. Mag. loaded with the .308 | 185gr | Berger JUG. Winchester StaBALL HD delivers the highest muzzle velocity at 3,048 fps; across all powders the maximum-charge window runs from 1,785 fps to 3,048 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 185.0 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. Norma MRP, Vihtavuori N560, Accurate MAGPRO rank at the top here: for .300 Weath. Mag. with the .308 | 185gr | Berger JUG 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.