Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 170gr | Impala RNFP KO bullet and 74 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-26 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 55,956 psi | 88% | 2959 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 57,696 psi | 90% | 3002 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 57,363 psi | 90% | 3094 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 82% | 54,984 psi | 86% | 2904 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,305 psi | 90% | 3038 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 96% | 55,129 psi | 86% | 3035 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,684 psi | 65% | 2822 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,347 psi | 88% | 2930 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,319 psi | 90% | 3048 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,853 psi | 86% | 3012 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,869 psi | 89% | 3028 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,984 psi | 86% | 3038 fps | 98.5% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,767 psi | 87% | 3018 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,663 psi | 81% | 3012 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,173 psi | 88% | 3110 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,464 psi | 90% | 3074 fps | 98.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,964 psi | 75% | 2940 fps | 96.5% |
| Bofors RP5 | <<locked>> | 96% | 54,984 psi | 86% | 3038 fps | 98.5% |
| Bofors RP7 | <<locked>> | 86% | 56,275 psi | 88% | 2936 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,836 psi | 80% | 2946 fps | 97.2% |
| Hodgdon H380 | <<locked>> | 82% | 57,479 psi | 90% | 2966 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,955 psi | 86% | 2986 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 84% | 54,360 psi | 85% | 2943 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 94% | 55,056 psi | 86% | 2972 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,041 psi | 85% | 2956 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,476 psi | 85% | 2920 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,662 psi | 79% | 3064 fps | 98.6% |
| Hodgdon Superformance | <<locked>> | 86% | 55,027 psi | 86% | 3018 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,057 psi | 58% | 1860 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,421 psi | 90% | 2972 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,464 psi | 90% | 2959 fps | 99.5% |
| IMR 4831 | <<locked>> | 90% | 57,479 psi | 90% | 2986 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,478 psi | 89% | 2963 fps | 97.1% |
| IMR 7828 SSC | <<locked>> | 98% | 56,449 psi | 88% | 3071 fps | 97.7% |
| Lovex S065 | <<locked>> | 86% | 55,056 psi | 86% | 2910 fps | 99.8% |
| Lovex S070 | <<locked>> | 88% | 56,623 psi | 89% | 2956 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,650 psi | 84% | 2923 fps | 99.7% |
| Norma 204 | <<locked>> | 88% | 54,723 psi | 86% | 2969 fps | 98.2% |
| Norma MRP | <<locked>> | 94% | 54,578 psi | 86% | 3061 fps | 99.4% |
| Norma URP | <<locked>> | 88% | 55,506 psi | 87% | 2976 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,101 psi | 89% | 3091 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 90% | 57,638 psi | 90% | 3031 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,332 psi | 87% | 3025 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,029 psi | 60% | 1906 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,087 psi | 89% | 2949 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,244 psi | 85% | 3002 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,130 psi | 90% | 3018 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,853 psi | 86% | 3041 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,126 psi | 80% | 3061 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 82% | 54,578 psi | 86% | 2900 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,259 psi | 87% | 2946 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 94% | 56,420 psi | 88% | 3015 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 86% | 56,275 psi | 88% | 2936 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,056 psi | 86% | 2910 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 88% | 56,623 psi | 89% | 2956 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,317 psi | 87% | 2953 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,392 psi | 90% | 2815 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,476 psi | 85% | 2861 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,956 psi | 88% | 3012 fps | 98.6% |
| Somchem S355 | <<locked>> | 84% | 57,334 psi | 90% | 2940 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,956 psi | 89% | 2940 fps | 97% |
| Somchem S365 | <<locked>> | 90% | 55,550 psi | 87% | 2986 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,261 psi | 90% | 2992 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 84% | 55,100 psi | 86% | 2864 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,363 psi | 90% | 2969 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,333 psi | 88% | 2963 fps | 99% |
| Vihtavuori N550 | <<locked>> | 88% | 56,594 psi | 89% | 2976 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,303 psi | 87% | 3002 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,520 psi | 85% | 3048 fps | 96.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,404 psi | 85% | 3025 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,637 psi | 89% | 2927 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,187 psi | 86% | 2989 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 56,202 psi | 88% | 3156 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,029 psi | 89% | 2982 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>> | 80% | 33,939 psi | 53% | 2526 fps | 95.5% |
| Accurate 4350 | <<locked>> | 80% | 44,614 psi | 70% | 2779 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 92% | 50,212 psi | 79% | 2969 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 51,793 psi | 81% | 2851 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 41,829 psi | 66% | 2746 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 92% | 48,428 psi | 76% | 2910 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 96% | 36,941 psi | 58% | 2700 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,011 psi | 83% | 2881 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,090 psi | 66% | 2776 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,921 psi | 75% | 2897 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 41,829 psi | 66% | 2743 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 88% | 42,598 psi | 67% | 2802 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,126 psi | 50% | 2549 fps | 98.4% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,865 psi | 50% | 2556 fps | 95.1% |
| Alliant Reloder-26 | 69.5 gr | 80% | 34,592 psi | 54% | 2671 fps | 97.3% |
| Bofors RP15 | <<locked>> | 90% | 42,221 psi | 66% | 2792 fps | 95.4% |
| Bofors RP30 | <<locked>> | 98% | 44,889 psi | 70% | 2881 fps | 95.6% |
| Bofors RP5 | <<locked>> | 88% | 42,598 psi | 67% | 2802 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 47,181 psi | 74% | 2776 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 96% | 44,831 psi | 70% | 2828 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 54,114 psi | 85% | 2913 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,614 psi | 71% | 2815 fps | 98% |
| Hodgdon H4350 | <<locked>> | 80% | 48,080 psi | 75% | 2828 fps | 97.3% |
| Hodgdon H4831 | <<locked>> | 90% | 48,399 psi | 76% | 2854 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 92% | 50,763 psi | 80% | 2897 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,016 psi | 63% | 2667 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 39,668 psi | 62% | 2808 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 44,570 psi | 70% | 2828 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,920 psi | 44% | 1667 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,438 psi | 67% | 2697 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,095 psi | 75% | 2795 fps | 98.3% |
| IMR 4831 | <<locked>> | 80% | 42,380 psi | 66% | 2723 fps | 99.3% |
| IMR 4955 Enduron | <<locked>> | 90% | 50,125 psi | 79% | 2851 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 92% | 46,586 psi | 73% | 2887 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 46,311 psi | 73% | 2756 fps | 99% |
| Lovex S070 | <<locked>> | 80% | 44,657 psi | 70% | 2743 fps | 97.9% |
| Lovex S071 | <<locked>> | 84% | 33,315 psi | 52% | 2510 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 42,250 psi | 66% | 2730 fps | 95.2% |
| Norma MRP | 69.2 gr | 82% | 36,840 psi | 58% | 2697 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 43,395 psi | 68% | 2759 fps | 99.3% |
| Ramshot Grand | <<locked>> | 92% | 46,630 psi | 73% | 2897 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 42,090 psi | 66% | 2749 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 90% | 39,247 psi | 62% | 2713 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,529 psi | 45% | 1706 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,650 psi | 84% | 2894 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,633 psi | 79% | 2946 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,005 psi | 69% | 2795 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,989 psi | 66% | 2799 fps | 98.9% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 36,709 psi | 58% | 2726 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 51,343 psi | 80% | 2851 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 46,180 psi | 72% | 2782 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 84% | 41,292 psi | 65% | 2730 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 47,181 psi | 74% | 2776 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,311 psi | 73% | 2756 fps | 99% |
| Shooters World SW4350 | <<locked>> | 80% | 44,657 psi | 70% | 2743 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,851 psi | 81% | 2897 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,169 psi | 80% | 2726 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,281 psi | 71% | 2700 fps | 97.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 40,915 psi | 64% | 2723 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 51,082 psi | 80% | 2844 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 50,299 psi | 79% | 2828 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 40,234 psi | 63% | 2723 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 39,624 psi | 62% | 2661 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 48,791 psi | 76% | 2766 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,701 psi | 70% | 2756 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 86% | 38,856 psi | 61% | 2638 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 44,309 psi | 69% | 2762 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 36,013 psi | 56% | 2631 fps | 98.4% |
| Vihtavuori N560 | 75.9 gr | 90% | 47,848 psi | 75% | 2923 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 96% | 47,892 psi | 75% | 2907 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,482 psi | 68% | 2717 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,614 psi | 71% | 2815 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 80% | 28,906 psi | 45% | 2552 fps | 98.3% |
| Winchester Supreme 780 | <<locked>> | 86% | 41,017 psi | 64% | 2690 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 80 powders for .300 Weath. Mag. loaded with the .308 | 170gr | Impala RNFP KO. Winchester StaBALL HD delivers the highest muzzle velocity at 3,156 fps; across all powders the maximum-charge window runs from 1,860 fps to 3,156 fps. ADI AR 2217 gives the best case fill at 100 %, and 80 of the 80 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 1:12.5 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, Alliant Reloder-26, Vihtavuori N560 rank at the top here: for .300 Weath. Mag. with the .308 | 170gr | Impala RNFP KO they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Baschieri & Pellagri 109, IMR 8133 Enduron, ReloadSwiss RS 80 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.