Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 168gr | Sierra MatchKing bullet and 83 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 Alliant Reloder-26.
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 2700 | <<locked>> | 82% | 56,826 psi | 89% | 2943 fps | 99.1% |
| Accurate 3100 | <<locked>> | 98% | 56,043 psi | 88% | 2999 fps | 99.8% |
| Accurate 4064 | <<locked>> | 82% | 56,449 psi | 88% | 2923 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,244 psi | 85% | 2989 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 54,636 psi | 86% | 3081 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 84% | 56,028 psi | 88% | 2956 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,955 psi | 86% | 3031 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 98% | 56,333 psi | 88% | 3091 fps | 97.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,914 psi | 61% | 2785 fps | 96.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,159 psi | 90% | 2982 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,305 psi | 90% | 3005 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,940 psi | 86% | 3048 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 56,231 psi | 88% | 3064 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,404 psi | 85% | 3018 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,840 psi | 88% | 3084 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,666 psi | 89% | 3064 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,907 psi | 77% | 2995 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 96% | 57,217 psi | 90% | 3156 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,737 psi | 86% | 3064 fps | 98.4% |
| Bofors RP3 | <<locked>> | 82% | 54,505 psi | 85% | 2943 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 55,840 psi | 88% | 3084 fps | 98.7% |
| Bofors RP7 | <<locked>> | 88% | 57,276 psi | 90% | 2989 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,457 psi | 76% | 2936 fps | 96.7% |
| Hodgdon H380 | <<locked>> | 82% | 54,810 psi | 86% | 2966 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,159 psi | 88% | 3041 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 86% | 55,477 psi | 87% | 2995 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 96% | 56,579 psi | 89% | 3031 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,230 psi | 87% | 3009 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,245 psi | 87% | 2969 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,921 psi | 75% | 3041 fps | 98% |
| Hodgdon Superformance | <<locked>> | 88% | 56,565 psi | 89% | 3077 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,782 psi | 58% | 1883 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,492 psi | 87% | 2940 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,071 psi | 86% | 2969 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,434 psi | 87% | 2963 fps | 99.3% |
| IMR 4831 | <<locked>> | 90% | 54,476 psi | 85% | 2979 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,609 psi | 90% | 3015 fps | 97.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,595 psi | 90% | 3123 fps | 97.9% |
| Lovex S062 | <<locked>> | 82% | 55,941 psi | 88% | 2933 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,753 psi | 87% | 2959 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 57,217 psi | 90% | 3002 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,951 psi | 78% | 2897 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 56,594 psi | 89% | 2989 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,825 psi | 87% | 3022 fps | 98.3% |
| Norma MRP | <<locked>> | 96% | 55,521 psi | 87% | 3110 fps | 99.5% |
| Norma URP | <<locked>> | 90% | 56,304 psi | 88% | 3025 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,566 psi | 90% | 3015 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,563 psi | 86% | 3084 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 90% | 55,042 psi | 86% | 3025 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,649 psi | 83% | 3015 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,449 psi | 59% | 1926 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,505 psi | 85% | 2946 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,709 psi | 87% | 3058 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 53,969 psi | 85% | 3009 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,246 psi | 88% | 3097 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,312 psi | 76% | 3038 fps | 99% |
| Rottweil R 903 | <<locked>> | 84% | 54,810 psi | 86% | 2943 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,420 psi | 88% | 3002 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 96% | 57,551 psi | 90% | 3068 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 88% | 57,276 psi | 90% | 2989 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,753 psi | 87% | 2959 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 55,941 psi | 88% | 2933 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,217 psi | 90% | 3002 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,246 psi | 88% | 3002 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,274 psi | 87% | 2825 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,158 psi | 86% | 2910 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 57,087 psi | 89% | 3064 fps | 98.8% |
| Somchem S355 | <<locked>> | 84% | 54,534 psi | 85% | 2936 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,505 psi | 85% | 2936 fps | 96.5% |
| Somchem S365 | <<locked>> | 92% | 56,318 psi | 88% | 3031 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,491 psi | 85% | 2982 fps | 99% |
| Vihtavuori N150 | <<locked>> | 86% | 55,796 psi | 87% | 2910 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,752 psi | 86% | 2966 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,566 psi | 90% | 3015 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 82% | 56,623 psi | 89% | 2910 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,377 psi | 90% | 3022 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,405 psi | 87% | 3038 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,579 psi | 87% | 3100 fps | 97.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,256 psi | 80% | 3005 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,244 psi | 85% | 2927 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,159 psi | 88% | 3041 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 53,171 psi | 83% | 3140 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,418 psi | 85% | 2976 fps | 98.2% |
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 2700 | <<locked>> | 80% | 53,055 psi | 83% | 2884 fps | 98.6% |
| Accurate 3100 | <<locked>> | 84% | 34,925 psi | 55% | 2592 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 53,055 psi | 83% | 2874 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,060 psi | 64% | 2746 fps | 99% |
| Accurate MAGPRO | <<locked>> | 94% | 50,763 psi | 80% | 3012 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 49,545 psi | 78% | 2851 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 42,148 psi | 66% | 2789 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 92% | 46,050 psi | 72% | 2897 fps | 95% |
| ADI AR 2225 | <<locked>> | 98% | 36,593 psi | 57% | 2723 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,502 psi | 79% | 2877 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,650 psi | 84% | 2949 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,566 psi | 62% | 2756 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,426 psi | 71% | 2887 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 41,989 psi | 66% | 2782 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 90% | 42,569 psi | 67% | 2835 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,283 psi | 46% | 2503 fps | 97.3% |
| Alliant Reloder-25 | <<locked>> | 88% | 33,272 psi | 52% | 2635 fps | 95.8% |
| Alliant Reloder-26 | 71.1 gr | 80% | 31,531 psi | 49% | 2621 fps | 95.8% |
| Bofors RP15 | <<locked>> | 92% | 42,032 psi | 66% | 2822 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 51,155 psi | 80% | 2894 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 42,569 psi | 67% | 2835 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 44,556 psi | 70% | 2759 fps | 97.2% |
| Hodgdon H1000 | <<locked>> | 98% | 45,223 psi | 71% | 2871 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 51,271 psi | 80% | 2904 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 42,960 psi | 67% | 2795 fps | 97.3% |
| Hodgdon H4350 | <<locked>> | 80% | 45,730 psi | 72% | 2818 fps | 96.8% |
| Hodgdon H4831 | <<locked>> | 92% | 49,298 psi | 77% | 2904 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 48,283 psi | 76% | 2884 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,246 psi | 58% | 2644 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 96% | 42,061 psi | 66% | 2904 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 41,901 psi | 66% | 2808 fps | 96.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,470 psi | 43% | 1683 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,141 psi | 82% | 2887 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,161 psi | 63% | 2684 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,021 psi | 72% | 2792 fps | 97.9% |
| IMR 4831 | <<locked>> | 80% | 39,334 psi | 62% | 2697 fps | 98.7% |
| IMR 4955 Enduron | <<locked>> | 90% | 47,834 psi | 75% | 2841 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 94% | 47,181 psi | 74% | 2933 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 52,591 psi | 82% | 2881 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,497 psi | 68% | 2740 fps | 98.5% |
| Lovex S070 | <<locked>> | 80% | 41,727 psi | 65% | 2720 fps | 97.2% |
| Lovex S071 | <<locked>> | 88% | 33,953 psi | 53% | 2566 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 53,011 psi | 83% | 2933 fps | 100% |
| Norma 204 | <<locked>> | 82% | 42,598 psi | 67% | 2772 fps | 95.3% |
| Norma MRP | 72.5 gr | 84% | 36,434 psi | 57% | 2720 fps | 95% |
| Norma URP | <<locked>> | 80% | 40,567 psi | 64% | 2740 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 80% | 53,954 psi | 85% | 2963 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 47,079 psi | 74% | 2940 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 39,450 psi | 62% | 2726 fps | 97.2% |
| Ramshot Magnum | <<locked>> | 92% | 39,146 psi | 61% | 2746 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,978 psi | 44% | 1722 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,082 psi | 80% | 2887 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,182 psi | 76% | 2940 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,915 psi | 64% | 2766 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,494 psi | 62% | 2779 fps | 98.4% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 38,899 psi | 61% | 2818 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 80% | 48,080 psi | 75% | 2835 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 46,572 psi | 73% | 2825 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 86% | 41,292 psi | 65% | 2766 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 44,556 psi | 70% | 2759 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,497 psi | 68% | 2740 fps | 98.5% |
| Shooters World Precision | <<locked>> | 80% | 52,591 psi | 82% | 2881 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,727 psi | 65% | 2720 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,327 psi | 77% | 2890 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,892 psi | 77% | 2730 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,583 psi | 67% | 2684 fps | 97.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 40,915 psi | 64% | 2762 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 48,138 psi | 75% | 2831 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 51,111 psi | 80% | 2877 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 37,275 psi | 58% | 2697 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 39,175 psi | 61% | 2687 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 46,021 psi | 72% | 2756 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,959 psi | 66% | 2736 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 88% | 38,725 psi | 61% | 2671 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 53,127 psi | 83% | 2861 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,510 psi | 65% | 2740 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 80% | 32,721 psi | 51% | 2585 fps | 97.4% |
| Vihtavuori N560 | 79.4 gr | 92% | 48,472 psi | 76% | 2969 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 98% | 47,834 psi | 75% | 2940 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,089 psi | 64% | 2703 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,960 psi | 67% | 2795 fps | 97.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,933 psi | 41% | 2477 fps | 96.2% |
| Winchester Supreme 780 | <<locked>> | 88% | 41,147 psi | 64% | 2726 fps | 95% |
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 89 powders for .300 Weath. Mag. loaded with the .308 | 168gr | Sierra MatchKing. Alliant Reloder-26 delivers the highest muzzle velocity at 3,156 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,156 fps. ADI AR 2217 gives the best case fill at 100 %, and 89 of the 89 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 168.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-23 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, Alliant Reloder-26 rank at the top here: for .300 Weath. Mag. with the .308 | 168gr | Sierra MatchKing 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.