Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 180gr | Sierra GameKing 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 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.
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 3100 | <<locked>> | 96% | 55,013 psi | 86% | 2890 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 56,768 psi | 89% | 2933 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 57,493 psi | 90% | 3041 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 82% | 54,650 psi | 86% | 2841 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,537 psi | 90% | 2986 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 96% | 55,172 psi | 86% | 2982 fps | 98% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,050 psi | 72% | 2808 fps | 96.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,973 psi | 64% | 2766 fps | 98% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 57,667 psi | 90% | 2982 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,883 psi | 88% | 2867 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,464 psi | 90% | 2986 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,027 psi | 86% | 2949 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,927 psi | 89% | 2969 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,882 psi | 86% | 2979 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,753 psi | 87% | 2956 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,619 psi | 81% | 2956 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,362 psi | 88% | 3048 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,392 psi | 90% | 3018 fps | 99.2% |
| Bofors RP3 | <<locked>> | 82% | 56,869 psi | 89% | 2884 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,485 psi | 74% | 2881 fps | 97.1% |
| Bofors RP5 | <<locked>> | 96% | 54,882 psi | 86% | 2979 fps | 99% |
| Bofors RP7 | <<locked>> | 86% | 55,796 psi | 87% | 2877 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,749 psi | 80% | 2900 fps | 98% |
| Hodgdon H380 | <<locked>> | 82% | 56,884 psi | 89% | 2900 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,853 psi | 86% | 2930 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 86% | 57,653 psi | 90% | 2943 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 94% | 55,100 psi | 86% | 2923 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 53,969 psi | 85% | 2904 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,172 psi | 85% | 2858 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,560 psi | 79% | 3012 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 86% | 55,100 psi | 86% | 2966 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,898 psi | 58% | 1818 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,551 psi | 90% | 2877 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,246 psi | 90% | 2917 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,363 psi | 90% | 2904 fps | 99.8% |
| IMR 4831 | <<locked>> | 90% | 56,898 psi | 89% | 2920 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,434 psi | 88% | 2910 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 98% | 56,507 psi | 89% | 3018 fps | 98.4% |
| Lovex S065 | <<locked>> | 86% | 54,433 psi | 85% | 2848 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,941 psi | 88% | 2894 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,576 psi | 82% | 2854 fps | 99.8% |
| Norma 204 | <<locked>> | 88% | 54,505 psi | 85% | 2913 fps | 98.7% |
| Norma MRP | <<locked>> | 94% | 54,520 psi | 85% | 3002 fps | 99.7% |
| Norma URP | <<locked>> | 88% | 55,143 psi | 86% | 2913 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,450 psi | 90% | 3045 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 90% | 57,580 psi | 90% | 2972 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,608 psi | 87% | 2976 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,608 psi | 59% | 1860 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,724 psi | 89% | 2890 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,491 psi | 85% | 2940 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,637 psi | 89% | 2953 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,940 psi | 86% | 2982 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,821 psi | 80% | 3005 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 84% | 57,188 psi | 90% | 2884 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,245 psi | 87% | 2897 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 94% | 56,347 psi | 88% | 2959 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 86% | 55,796 psi | 87% | 2877 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,433 psi | 85% | 2848 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,941 psi | 88% | 2894 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,027 psi | 86% | 2887 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,217 psi | 90% | 2756 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,203 psi | 90% | 2854 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,898 psi | 88% | 2956 fps | 99.1% |
| Somchem S355 | <<locked>> | 84% | 56,768 psi | 89% | 2874 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,913 psi | 89% | 2890 fps | 97.7% |
| Somchem S365 | <<locked>> | 90% | 55,187 psi | 86% | 2917 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,826 psi | 89% | 2933 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 84% | 54,578 psi | 86% | 2799 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,116 psi | 90% | 2907 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,405 psi | 88% | 2910 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 88% | 56,275 psi | 88% | 2913 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,665 psi | 86% | 2930 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,476 psi | 85% | 2992 fps | 97.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,027 psi | 85% | 2966 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,681 psi | 89% | 2867 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,071 psi | 86% | 2933 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 56,942 psi | 89% | 3094 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,927 psi | 89% | 2927 fps | 99.1% |
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>> | 80% | 32,039 psi | 50% | 2441 fps | 95.5% |
| Accurate 4350 | <<locked>> | 80% | 43,149 psi | 68% | 2703 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 92% | 49,835 psi | 78% | 2910 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 51,372 psi | 81% | 2792 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 38,638 psi | 61% | 2628 fps | 95% |
| ADI AR 2213 | <<locked>> | 90% | 45,005 psi | 71% | 2795 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 98% | 43,091 psi | 68% | 2746 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 96% | 36,042 psi | 56% | 2641 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 39,001 psi | 61% | 2631 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,518 psi | 82% | 2815 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,423 psi | 65% | 2710 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,616 psi | 75% | 2835 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 38,638 psi | 61% | 2625 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 86% | 39,189 psi | 61% | 2677 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,777 psi | 48% | 2470 fps | 98.6% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,632 psi | 48% | 2484 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,272 psi | 52% | 2595 fps | 97.5% |
| Bofors RP15 | <<locked>> | 88% | 38,812 psi | 61% | 2667 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 53,171 psi | 83% | 2831 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 41,408 psi | 65% | 2759 fps | 95.3% |
| Bofors RP5 | <<locked>> | 86% | 39,189 psi | 61% | 2677 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 46,253 psi | 72% | 2713 fps | 98.2% |
| Hodgdon H1000 | <<locked>> | 94% | 41,481 psi | 65% | 2713 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 53,447 psi | 84% | 2848 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,846 psi | 70% | 2749 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 80% | 47,485 psi | 74% | 2769 fps | 97.9% |
| Hodgdon H4831 | <<locked>> | 90% | 48,167 psi | 75% | 2802 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 90% | 47,195 psi | 74% | 2782 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,088 psi | 61% | 2598 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 38,856 psi | 61% | 2749 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 44,208 psi | 69% | 2772 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,644 psi | 43% | 1627 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 54,085 psi | 85% | 2825 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,872 psi | 66% | 2641 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,572 psi | 75% | 2736 fps | 98.8% |
| IMR 4831 | <<locked>> | 80% | 41,191 psi | 65% | 2651 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 88% | 46,789 psi | 73% | 2740 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 90% | 43,105 psi | 68% | 2769 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 45,252 psi | 71% | 2690 fps | 99.3% |
| Lovex S070 | <<locked>> | 80% | 43,511 psi | 68% | 2674 fps | 98.3% |
| Lovex S071 | <<locked>> | 84% | 31,502 psi | 49% | 2428 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 41,669 psi | 65% | 2674 fps | 95.9% |
| Norma MRP | 70.1 gr | 82% | 35,795 psi | 56% | 2625 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 42,496 psi | 67% | 2694 fps | 99.6% |
| Ramshot Grand | 76.3 gr | 90% | 43,018 psi | 67% | 2779 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 41,408 psi | 65% | 2687 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 90% | 38,305 psi | 60% | 2651 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,195 psi | 44% | 1663 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,127 psi | 83% | 2835 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,531 psi | 79% | 2881 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,105 psi | 68% | 2726 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,350 psi | 65% | 2736 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 35,592 psi | 56% | 2661 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 50,140 psi | 79% | 2779 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 42,699 psi | 67% | 2667 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 82% | 37,898 psi | 59% | 2608 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 46,253 psi | 72% | 2713 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,252 psi | 71% | 2690 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 80% | 43,511 psi | 68% | 2674 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,517 psi | 81% | 2835 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,647 psi | 79% | 2664 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,324 psi | 69% | 2638 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 40,132 psi | 63% | 2661 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 50,096 psi | 79% | 2772 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 46,557 psi | 73% | 2713 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 39,378 psi | 62% | 2654 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,926 psi | 56% | 2536 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 47,921 psi | 75% | 2700 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,888 psi | 69% | 2690 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 37,869 psi | 59% | 2572 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 43,410 psi | 68% | 2694 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 34,418 psi | 54% | 2549 fps | 98.5% |
| Vihtavuori N560 | 75.2 gr | 88% | 44,338 psi | 69% | 2802 fps | 95% |
| Vihtavuori N565 | <<locked>> | 94% | 44,106 psi | 69% | 2782 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,888 psi | 67% | 2654 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,034 psi | 71% | 2756 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,325 psi | 43% | 2467 fps | 98.3% |
| Winchester Supreme 780 | <<locked>> | 86% | 40,393 psi | 63% | 2635 fps | 95.7% |
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 | 180gr | Sierra GameKing. Winchester StaBALL HD delivers the highest muzzle velocity at 3,094 fps; across all powders the maximum-charge window runs from 1,818 fps to 3,094 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 180.0 gr projectile in 0.308" calls for a 1:12.5 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. Norma MRP, Vihtavuori N560, Ramshot Grand rank at the top here: for .300 Weath. Mag. with the .308 | 180gr | Sierra GameKing 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.