Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 168gr | Norma Diamond 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% | 56,768 psi | 89% | 2946 fps | 99.1% |
| Accurate 3100 | <<locked>> | 98% | 56,246 psi | 88% | 2999 fps | 99.8% |
| Accurate 4064 | <<locked>> | 82% | 56,463 psi | 88% | 2923 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,186 psi | 85% | 2989 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 54,578 psi | 86% | 3081 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 84% | 55,985 psi | 88% | 2956 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,897 psi | 86% | 3031 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 98% | 56,347 psi | 88% | 3087 fps | 97.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,030 psi | 61% | 2789 fps | 96.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,101 psi | 89% | 2979 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,261 psi | 90% | 3005 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,897 psi | 86% | 3045 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 56,173 psi | 88% | 3068 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,389 psi | 85% | 3018 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,782 psi | 87% | 3084 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,637 psi | 89% | 3064 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,124 psi | 77% | 3002 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 96% | 57,406 psi | 90% | 3159 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,723 psi | 86% | 3064 fps | 98.4% |
| Bofors RP3 | <<locked>> | 82% | 54,694 psi | 86% | 2946 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 55,782 psi | 87% | 3084 fps | 98.7% |
| Bofors RP7 | <<locked>> | 88% | 57,217 psi | 90% | 2989 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,428 psi | 76% | 2936 fps | 96.7% |
| Hodgdon H380 | <<locked>> | 82% | 54,766 psi | 86% | 2963 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,115 psi | 88% | 3038 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 86% | 55,463 psi | 87% | 2999 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 96% | 56,550 psi | 89% | 3031 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,390 psi | 87% | 3012 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,259 psi | 87% | 2969 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,080 psi | 75% | 3045 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 88% | 56,579 psi | 89% | 3077 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,767 psi | 58% | 1883 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,448 psi | 87% | 2936 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,027 psi | 86% | 2969 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,405 psi | 87% | 2963 fps | 99.3% |
| IMR 4831 | <<locked>> | 90% | 54,650 psi | 86% | 2979 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 54,186 psi | 85% | 2956 fps | 96.7% |
| IMR 7828 SSC | <<locked>> | 98% | 53,911 psi | 84% | 3061 fps | 97.2% |
| Lovex S062 | <<locked>> | 82% | 55,927 psi | 88% | 2933 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,738 psi | 87% | 2959 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 57,174 psi | 90% | 3005 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,966 psi | 78% | 2897 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 56,579 psi | 89% | 2989 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,057 psi | 88% | 3025 fps | 98.4% |
| Norma MRP | <<locked>> | 96% | 55,753 psi | 87% | 3114 fps | 99.5% |
| Norma URP | <<locked>> | 90% | 56,275 psi | 88% | 3025 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,580 psi | 90% | 3015 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,534 psi | 85% | 3081 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 90% | 55,259 psi | 87% | 3028 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,576 psi | 82% | 3015 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,434 psi | 59% | 1926 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,462 psi | 85% | 2946 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,651 psi | 87% | 3058 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 54,143 psi | 85% | 3009 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,188 psi | 88% | 3097 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,312 psi | 76% | 3038 fps | 99% |
| Rottweil R 903 | <<locked>> | 84% | 54,752 psi | 86% | 2943 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,391 psi | 88% | 3002 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 96% | 57,508 psi | 90% | 3068 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 88% | 57,217 psi | 90% | 2989 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,738 psi | 87% | 2959 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 55,927 psi | 88% | 2933 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,174 psi | 90% | 3005 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,202 psi | 88% | 3002 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,230 psi | 87% | 2825 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,100 psi | 86% | 2907 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 57,029 psi | 89% | 3061 fps | 98.8% |
| Somchem S355 | <<locked>> | 84% | 54,708 psi | 86% | 2940 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,723 psi | 86% | 2940 fps | 96.6% |
| Somchem S365 | <<locked>> | 92% | 56,260 psi | 88% | 3028 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,462 psi | 85% | 2982 fps | 99% |
| Vihtavuori N150 | <<locked>> | 86% | 55,985 psi | 88% | 2913 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,752 psi | 86% | 2966 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,508 psi | 90% | 3015 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 82% | 56,579 psi | 89% | 2910 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,609 psi | 90% | 3025 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,347 psi | 87% | 3038 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,753 psi | 87% | 3100 fps | 97.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,416 psi | 81% | 3009 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,201 psi | 85% | 2927 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,333 psi | 88% | 3041 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 53,127 psi | 83% | 3140 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,433 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% | 53,011 psi | 83% | 2884 fps | 98.6% |
| Accurate 3100 | <<locked>> | 84% | 34,925 psi | 55% | 2589 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 53,040 psi | 83% | 2874 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,205 psi | 65% | 2749 fps | 99% |
| Accurate MAGPRO | <<locked>> | 94% | 50,734 psi | 80% | 3012 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 49,516 psi | 78% | 2851 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 42,163 psi | 66% | 2785 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 92% | 46,006 psi | 72% | 2894 fps | 95% |
| ADI AR 2225 | <<locked>> | 98% | 36,579 psi | 57% | 2723 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,473 psi | 79% | 2877 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,824 psi | 84% | 2949 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,537 psi | 62% | 2756 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,382 psi | 71% | 2887 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 42,003 psi | 66% | 2782 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 90% | 42,569 psi | 67% | 2835 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,254 psi | 46% | 2503 fps | 97.3% |
| Alliant Reloder-25 | <<locked>> | 88% | 33,243 psi | 52% | 2631 fps | 95.8% |
| Alliant Reloder-26 | 71.1 gr | 80% | 31,517 psi | 49% | 2618 fps | 95.8% |
| Bofors RP15 | <<locked>> | 92% | 42,177 psi | 66% | 2825 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 51,140 psi | 80% | 2890 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 42,569 psi | 67% | 2835 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 44,512 psi | 70% | 2759 fps | 97.2% |
| Hodgdon H1000 | <<locked>> | 98% | 45,165 psi | 71% | 2871 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 51,285 psi | 80% | 2904 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 42,946 psi | 67% | 2799 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 80% | 45,745 psi | 72% | 2818 fps | 96.8% |
| Hodgdon H4831 | <<locked>> | 92% | 49,255 psi | 77% | 2904 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 48,298 psi | 76% | 2887 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,246 psi | 58% | 2644 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 94% | 39,450 psi | 62% | 2838 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 42,032 psi | 66% | 2812 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,470 psi | 43% | 1683 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,098 psi | 82% | 2887 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,147 psi | 63% | 2684 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,977 psi | 72% | 2792 fps | 97.9% |
| IMR 4831 | <<locked>> | 80% | 39,291 psi | 62% | 2697 fps | 98.7% |
| IMR 4955 Enduron | <<locked>> | 90% | 47,790 psi | 75% | 2841 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 94% | 47,123 psi | 74% | 2930 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 52,576 psi | 82% | 2884 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,468 psi | 68% | 2736 fps | 98.5% |
| Lovex S070 | <<locked>> | 80% | 41,742 psi | 65% | 2720 fps | 97.2% |
| Lovex S071 | <<locked>> | 88% | 33,924 psi | 53% | 2566 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 53,185 psi | 83% | 2936 fps | 100% |
| Norma 204 | <<locked>> | 82% | 42,569 psi | 67% | 2776 fps | 95.3% |
| Norma MRP | 72.5 gr | 84% | 36,448 psi | 57% | 2720 fps | 95% |
| Norma URP | <<locked>> | 80% | 40,538 psi | 64% | 2740 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 80% | 53,911 psi | 84% | 2959 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 47,239 psi | 74% | 2946 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 39,421 psi | 62% | 2726 fps | 97.2% |
| Ramshot Magnum | <<locked>> | 92% | 39,102 psi | 61% | 2743 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,978 psi | 44% | 1722 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,068 psi | 80% | 2887 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,153 psi | 75% | 2940 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,930 psi | 64% | 2766 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,465 psi | 62% | 2776 fps | 98.3% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 39,030 psi | 61% | 2825 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 80% | 48,037 psi | 75% | 2835 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 46,731 psi | 73% | 2828 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 86% | 41,249 psi | 65% | 2766 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 44,512 psi | 70% | 2759 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,468 psi | 68% | 2736 fps | 98.5% |
| Shooters World Precision | <<locked>> | 80% | 52,576 psi | 82% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,742 psi | 65% | 2720 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,284 psi | 77% | 2890 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,878 psi | 77% | 2730 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,583 psi | 67% | 2680 fps | 97.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 40,886 psi | 64% | 2759 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 48,153 psi | 75% | 2831 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 51,126 psi | 80% | 2877 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 37,260 psi | 58% | 2697 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 39,160 psi | 61% | 2690 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 46,006 psi | 72% | 2756 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,105 psi | 66% | 2740 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 88% | 38,682 psi | 61% | 2667 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 53,084 psi | 83% | 2858 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,481 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% | 47,993 psi | 75% | 2943 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,075 psi | 64% | 2703 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,120 psi | 68% | 2799 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,918 psi | 41% | 2477 fps | 96.3% |
| Winchester Supreme 780 | <<locked>> | 88% | 41,104 psi | 64% | 2730 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 83 powders for .300 Weath. Mag. loaded with the .308 | 168gr | Norma Diamond. Alliant Reloder-26 delivers the highest muzzle velocity at 3,159 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,159 fps. ADI AR 2225 gives the best case fill at 100 %, and 83 of the 83 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 168.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, 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, Alliant Reloder-26 rank at the top here: for .300 Weath. Mag. with the .308 | 168gr | Norma Diamond 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.