Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 170gr | Hornady InterLock FP bullet and 79 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Vihtavuori N560.
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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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% | 54,128 psi | 85% | 2953 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 55,608 psi | 87% | 2995 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 56,231 psi | 88% | 3097 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 84% | 57,246 psi | 90% | 2963 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,579 psi | 89% | 3048 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 96% | 54,085 psi | 85% | 3038 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,190 psi | 63% | 2808 fps | 97.1% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,244 psi | 85% | 3005 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,998 psi | 86% | 2933 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,289 psi | 88% | 3051 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 53,824 psi | 84% | 3012 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,999 psi | 88% | 3031 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,464 psi | 90% | 3097 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,868 psi | 86% | 3022 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,618 psi | 79% | 3015 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,071 psi | 86% | 3107 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,376 psi | 88% | 3077 fps | 98.8% |
| Bofors RP3 | <<locked>> | 82% | 55,854 psi | 88% | 2949 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,427 psi | 73% | 2930 fps | 96.3% |
| Bofors RP5 | <<locked>> | 98% | 57,464 psi | 90% | 3097 fps | 99% |
| Bofors RP7 | <<locked>> | 86% | 54,969 psi | 86% | 2940 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,748 psi | 78% | 2953 fps | 97.3% |
| Hodgdon H380 | <<locked>> | 82% | 56,043 psi | 88% | 2969 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,609 psi | 90% | 3051 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 86% | 56,666 psi | 89% | 3005 fps | 99% |
| Hodgdon H4831 | <<locked>> | 94% | 54,302 psi | 85% | 2982 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,768 psi | 89% | 3022 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,797 psi | 89% | 2976 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,574 psi | 78% | 3064 fps | 98.6% |
| Hodgdon Superformance | <<locked>> | 86% | 54,027 psi | 85% | 3022 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,782 psi | 58% | 1877 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,739 psi | 89% | 2946 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,362 psi | 88% | 2979 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,550 psi | 89% | 2969 fps | 99.5% |
| IMR 4831 | <<locked>> | 90% | 55,956 psi | 88% | 2986 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,651 psi | 87% | 2969 fps | 97.2% |
| IMR 7828 SSC | <<locked>> | 98% | 55,521 psi | 87% | 3074 fps | 97.7% |
| Lovex S062 | <<locked>> | 82% | 57,043 psi | 89% | 2936 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,898 psi | 89% | 2966 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 54,984 psi | 86% | 2956 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,590 psi | 81% | 2910 fps | 99.6% |
| Norma 204 | <<locked>> | 90% | 57,435 psi | 90% | 3035 fps | 98.7% |
| Norma MRP | <<locked>> | 96% | 57,522 psi | 90% | 3127 fps | 99.7% |
| Norma URP | <<locked>> | 88% | 54,128 psi | 85% | 2976 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,231 psi | 88% | 3100 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 56,681 psi | 89% | 3038 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,418 psi | 85% | 3031 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,637 psi | 59% | 1923 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,869 psi | 88% | 2953 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,159 psi | 90% | 3058 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,666 psi | 87% | 3018 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 53,969 psi | 85% | 3045 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,879 psi | 78% | 3058 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 84% | 56,130 psi | 88% | 2949 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,317 psi | 85% | 2956 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 94% | 55,376 psi | 87% | 3018 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 86% | 54,969 psi | 86% | 2940 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,898 psi | 89% | 2966 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,043 psi | 89% | 2936 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 54,984 psi | 86% | 2956 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,740 psi | 90% | 3009 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,275 psi | 88% | 2822 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,434 psi | 88% | 2917 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,926 psi | 86% | 3015 fps | 98.7% |
| Somchem S355 | <<locked>> | 84% | 55,796 psi | 87% | 2943 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,912 psi | 88% | 2946 fps | 97% |
| Somchem S365 | <<locked>> | 90% | 54,143 psi | 85% | 2982 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,869 psi | 88% | 2992 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 86% | 57,246 psi | 90% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,999 psi | 88% | 2972 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,259 psi | 87% | 2969 fps | 99% |
| Vihtavuori N550 | <<locked>> | 88% | 55,201 psi | 87% | 2976 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 57,217 psi | 90% | 3048 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,479 psi | 90% | 3117 fps | 97.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,026 psi | 83% | 3022 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,738 psi | 87% | 2933 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,012 psi | 85% | 2992 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,535 psi | 87% | 3156 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,956 psi | 88% | 2989 fps | 98.6% |
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>> | 82% | 33,591 psi | 53% | 2543 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 42,322 psi | 66% | 2759 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 92% | 48,921 psi | 77% | 2966 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 50,531 psi | 79% | 2854 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 40,567 psi | 64% | 2740 fps | 95% |
| ADI AR 2213 | <<locked>> | 92% | 47,239 psi | 74% | 2910 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 98% | 37,652 psi | 59% | 2743 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 41,872 psi | 66% | 2766 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,576 psi | 81% | 2881 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,741 psi | 64% | 2769 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,717 psi | 73% | 2897 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 40,480 psi | 63% | 2733 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 88% | 40,988 psi | 64% | 2785 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,211 psi | 47% | 2520 fps | 97.9% |
| Alliant Reloder-25 | <<locked>> | 86% | 32,097 psi | 50% | 2585 fps | 95.4% |
| Alliant Reloder-26 | 72.3 gr | 80% | 32,648 psi | 51% | 2641 fps | 96.6% |
| Bofors RP15 | <<locked>> | 90% | 40,625 psi | 64% | 2776 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 52,489 psi | 82% | 2897 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 43,352 psi | 68% | 2867 fps | 95.3% |
| Bofors RP5 | <<locked>> | 88% | 40,988 psi | 64% | 2785 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 45,614 psi | 71% | 2769 fps | 97.6% |
| Hodgdon H1000 | <<locked>> | 96% | 43,569 psi | 68% | 2828 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 52,518 psi | 82% | 2913 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,121 psi | 69% | 2808 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 80% | 46,876 psi | 73% | 2828 fps | 97.3% |
| Hodgdon H4831 | <<locked>> | 90% | 47,268 psi | 74% | 2854 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 92% | 49,559 psi | 78% | 2900 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,261 psi | 60% | 2654 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 94% | 40,582 psi | 64% | 2858 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 43,221 psi | 68% | 2822 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,615 psi | 43% | 1680 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,185 psi | 83% | 2890 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,176 psi | 65% | 2697 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,920 psi | 74% | 2799 fps | 98.3% |
| IMR 4831 | <<locked>> | 80% | 40,466 psi | 63% | 2707 fps | 99.1% |
| IMR 4955 Enduron | <<locked>> | 90% | 48,994 psi | 77% | 2854 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 92% | 45,281 psi | 71% | 2881 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 53,679 psi | 84% | 2887 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,599 psi | 70% | 2749 fps | 98.9% |
| Lovex S070 | <<locked>> | 80% | 42,830 psi | 67% | 2730 fps | 97.7% |
| Lovex S071 | <<locked>> | 86% | 32,793 psi | 51% | 2523 fps | 95.2% |
| Norma 204 | <<locked>> | 80% | 40,828 psi | 64% | 2723 fps | 95% |
| Norma MRP | 73.6 gr | 84% | 37,478 psi | 59% | 2733 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 41,756 psi | 65% | 2749 fps | 99.2% |
| Ramshot Grand | <<locked>> | 92% | 45,237 psi | 71% | 2894 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 40,553 psi | 64% | 2740 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 92% | 40,422 psi | 63% | 2766 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,123 psi | 44% | 1719 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,228 psi | 82% | 2894 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,545 psi | 78% | 2946 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,134 psi | 66% | 2779 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,567 psi | 64% | 2789 fps | 98.8% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 37,478 psi | 59% | 2772 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 49,356 psi | 77% | 2841 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 44,759 psi | 70% | 2779 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 84% | 39,595 psi | 62% | 2717 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 45,614 psi | 71% | 2769 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,599 psi | 70% | 2749 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 53,679 psi | 84% | 2887 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,830 psi | 67% | 2730 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,546 psi | 79% | 2897 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,908 psi | 78% | 2733 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,642 psi | 68% | 2694 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 42,032 psi | 66% | 2772 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 49,400 psi | 77% | 2841 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 49,081 psi | 77% | 2828 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 38,522 psi | 60% | 2707 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 37,652 psi | 59% | 2641 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 47,181 psi | 74% | 2762 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,120 psi | 68% | 2746 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 88% | 39,740 psi | 62% | 2680 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 42,627 psi | 67% | 2749 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 33,721 psi | 53% | 2595 fps | 97.9% |
| Vihtavuori N560 | 78.9 gr | 90% | 46,586 psi | 73% | 2917 fps | 95% |
| Vihtavuori N565 | <<locked>> | 96% | 46,325 psi | 73% | 2897 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,134 psi | 66% | 2713 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,121 psi | 69% | 2808 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,731 psi | 42% | 2497 fps | 97.2% |
| Winchester Supreme 780 | <<locked>> | 88% | 42,337 psi | 66% | 2743 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 79 powders for .300 Weath. Mag. loaded with the .308 | 170gr | Hornady InterLock FP. Winchester StaBALL HD delivers the highest muzzle velocity at 3,156 fps; across all powders the maximum-charge window runs from 1,877 fps to 3,156 fps. ADI AR 2225 gives the best case fill at 100 %, and 79 of the 79 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 170.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-25, Bofors RP15 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. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for .300 Weath. Mag. with the .308 | 170gr | Hornady InterLock FP 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.