Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 170gr | Lapua Naturalis bullet and 89 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 ReloadSwiss RS 70.
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 2495 | <<locked>> | 82% | 56,304 psi | 88% | 2854 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,143 psi | 85% | 2877 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,304 psi | 88% | 2979 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 56,782 psi | 89% | 2913 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,389 psi | 85% | 2972 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 54,911 psi | 86% | 3068 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 86% | 57,246 psi | 90% | 2953 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,738 psi | 87% | 3025 fps | 98.4% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,290 psi | 90% | 3081 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,913 psi | 89% | 3077 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,520 psi | 85% | 2920 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,665 psi | 86% | 2943 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,477 psi | 87% | 3035 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,029 psi | 89% | 3061 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,027 psi | 86% | 3009 fps | 98.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,362 psi | 88% | 3074 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,214 psi | 83% | 2995 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,035 psi | 72% | 2923 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,682 psi | 90% | 3146 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,387 psi | 81% | 2986 fps | 97.7% |
| Bofors RP3 | <<locked>> | 84% | 55,259 psi | 87% | 2936 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,362 psi | 88% | 3074 fps | 98.7% |
| Bofors RP7 | <<locked>> | 88% | 54,737 psi | 86% | 2927 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 84% | 55,579 psi | 87% | 2956 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 56,826 psi | 89% | 3031 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 88% | 56,391 psi | 88% | 2989 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 98% | 57,392 psi | 90% | 3022 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,202 psi | 88% | 3002 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,869 psi | 88% | 2956 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,130 psi | 90% | 2992 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,947 psi | 70% | 2953 fps | 97% |
| Hodgdon Superformance | <<locked>> | 90% | 57,421 psi | 90% | 3071 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,376 psi | 57% | 1850 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,624 psi | 90% | 2956 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,521 psi | 89% | 2933 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,506 psi | 87% | 2917 fps | 99.3% |
| IMR 4350 | <<locked>> | 92% | 55,811 psi | 87% | 2959 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,376 psi | 88% | 2956 fps | 99.4% |
| IMR 4831 | <<locked>> | 92% | 55,114 psi | 86% | 2969 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,130 psi | 88% | 2972 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,042 psi | 86% | 2949 fps | 96.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,636 psi | 86% | 3051 fps | 97.2% |
| Lovex S062 | <<locked>> | 84% | 56,797 psi | 89% | 2927 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,449 psi | 88% | 2949 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 54,404 psi | 85% | 2940 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,601 psi | 73% | 2825 fps | 98.8% |
| Norma 203B | <<locked>> | 84% | 57,580 psi | 90% | 2982 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,826 psi | 89% | 3015 fps | 98.4% |
| Norma MRP | <<locked>> | 98% | 55,985 psi | 88% | 3097 fps | 99.5% |
| Norma URP | <<locked>> | 92% | 56,869 psi | 89% | 3015 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,752 psi | 86% | 2953 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,187 psi | 86% | 3071 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 92% | 55,767 psi | 87% | 3018 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,081 psi | 77% | 2933 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,999 psi | 58% | 1893 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,651 psi | 87% | 2943 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,391 psi | 88% | 3048 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,621 psi | 86% | 2999 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,971 psi | 89% | 3087 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,165 psi | 71% | 2953 fps | 98.2% |
| Rottweil R 902 | <<locked>> | 82% | 54,984 psi | 86% | 2884 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,317 psi | 87% | 2933 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,246 psi | 90% | 2992 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 96% | 54,201 psi | 85% | 2995 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 88% | 54,737 psi | 86% | 2927 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,449 psi | 88% | 2949 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 56,797 psi | 89% | 2927 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,404 psi | 85% | 2940 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,232 psi | 90% | 2995 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,188 psi | 88% | 2815 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,115 psi | 88% | 2900 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,551 psi | 90% | 3048 fps | 98.8% |
| Somchem S355 | <<locked>> | 86% | 55,376 psi | 87% | 2930 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,434 psi | 87% | 2927 fps | 96.5% |
| Somchem S365 | <<locked>> | 94% | 56,550 psi | 89% | 3015 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,969 psi | 86% | 2972 fps | 99% |
| Vihtavuori N135 | <<locked>> | 82% | 55,521 psi | 87% | 2841 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,912 psi | 88% | 2861 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,739 psi | 89% | 2904 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,317 psi | 87% | 2953 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,288 psi | 85% | 2943 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 84% | 57,566 psi | 90% | 2904 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,476 psi | 85% | 2959 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,550 psi | 87% | 3022 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,159 psi | 88% | 3087 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,129 psi | 86% | 2920 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,058 psi | 89% | 3035 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,849 psi | 77% | 3061 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,158 psi | 86% | 2966 fps | 98.3% |
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 2495 | <<locked>> | 80% | 52,649 psi | 83% | 2802 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,763 psi | 80% | 2825 fps | 98.2% |
| Accurate 3100 | <<locked>> | 86% | 34,534 psi | 54% | 2569 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 49,922 psi | 78% | 2812 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,334 psi | 60% | 2674 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 96% | 51,024 psi | 80% | 2999 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 47,340 psi | 74% | 2792 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 42,670 psi | 67% | 2779 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 96% | 49,922 psi | 78% | 2953 fps | 96% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,895 psi | 83% | 3015 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,819 psi | 75% | 2815 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,213 psi | 80% | 2887 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,333 psi | 59% | 2687 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,670 psi | 67% | 2818 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,438 psi | 67% | 2772 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 42,685 psi | 67% | 2822 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,209 psi | 43% | 2425 fps | 96.1% |
| Alliant Reloder-25 | <<locked>> | 90% | 33,156 psi | 52% | 2612 fps | 95.6% |
| Alliant Reloder-26 | 70.2 gr | 82% | 31,386 psi | 49% | 2605 fps | 95.6% |
| Bofors RP15 | <<locked>> | 94% | 42,076 psi | 66% | 2808 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 48,269 psi | 76% | 2828 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 42,685 psi | 67% | 2822 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 42,279 psi | 66% | 2694 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 80% | 48,689 psi | 76% | 2841 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 40,364 psi | 63% | 2723 fps | 96.5% |
| Hodgdon H4350 | <<locked>> | 80% | 43,424 psi | 68% | 2753 fps | 96% |
| Hodgdon H4831 | <<locked>> | 94% | 49,835 psi | 78% | 2894 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 94% | 48,776 psi | 76% | 2874 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,853 psi | 55% | 2575 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,287 psi | 84% | 2933 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 42,032 psi | 66% | 2884 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 39,450 psi | 62% | 2736 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,238 psi | 43% | 1657 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,012 psi | 85% | 2900 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,763 psi | 78% | 2825 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,083 psi | 82% | 2858 fps | 98.9% |
| IMR 4350 | <<locked>> | 80% | 37,942 psi | 59% | 2615 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,801 psi | 69% | 2730 fps | 97.3% |
| IMR 4831 | <<locked>> | 80% | 36,898 psi | 58% | 2628 fps | 98.1% |
| IMR 4895 | <<locked>> | 80% | 52,562 psi | 82% | 2917 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,399 psi | 76% | 2831 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 96% | 47,616 psi | 75% | 2920 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 50,067 psi | 78% | 2822 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,205 psi | 65% | 2674 fps | 98% |
| Lovex S070 | <<locked>> | 80% | 39,421 psi | 62% | 2654 fps | 96.5% |
| Lovex S071 | <<locked>> | 90% | 33,504 psi | 53% | 2543 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 50,575 psi | 79% | 2874 fps | 100% |
| Norma 204 | <<locked>> | 84% | 43,018 psi | 67% | 2766 fps | 95.3% |
| Norma MRP | 73.1 gr | 88% | 39,088 psi | 61% | 2769 fps | 96% |
| Norma URP | <<locked>> | 80% | 38,203 psi | 60% | 2671 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 80% | 51,097 psi | 80% | 2897 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 47,572 psi | 75% | 2930 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 37,115 psi | 58% | 2657 fps | 96.4% |
| Ramshot Magnum | <<locked>> | 94% | 39,233 psi | 61% | 2733 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,702 psi | 43% | 1696 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,544 psi | 76% | 2822 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,368 psi | 71% | 2874 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,174 psi | 60% | 2694 fps | 98.1% |
| ReloadSwiss RS 70 | 67.8 gr | 80% | 37,014 psi | 58% | 2700 fps | 97.5% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,914 psi | 61% | 2802 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 51,692 psi | 81% | 2835 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,382 psi | 71% | 2769 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 47,137 psi | 74% | 2815 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 88% | 41,379 psi | 65% | 2749 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 42,279 psi | 66% | 2694 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,205 psi | 65% | 2674 fps | 98% |
| Shooters World Precision | <<locked>> | 80% | 50,067 psi | 78% | 2822 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,421 psi | 62% | 2654 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,833 psi | 73% | 2828 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,586 psi | 73% | 2674 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,263 psi | 63% | 2618 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 41,002 psi | 64% | 2746 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 45,643 psi | 72% | 2769 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 51,793 psi | 81% | 2867 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 34,577 psi | 54% | 2625 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 39,218 psi | 61% | 2674 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 52,083 psi | 82% | 2792 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,402 psi | 82% | 2812 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,671 psi | 68% | 2697 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,639 psi | 62% | 2671 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 92% | 41,379 psi | 65% | 2710 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 50,662 psi | 79% | 2802 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,059 psi | 61% | 2671 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 30,052 psi | 47% | 2503 fps | 96.2% |
| Vihtavuori N560 | <<locked>> | 94% | 48,834 psi | 77% | 2956 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,711 psi | 61% | 2638 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 40,553 psi | 64% | 2730 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,585 psi | 40% | 2451 fps | 95.8% |
| Winchester Supreme 780 | <<locked>> | 90% | 41,510 psi | 65% | 2720 fps | 95.1% |
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 95 powders for .300 Weath. Mag. loaded with the .308 | 170gr | Lapua Naturalis. Alliant Reloder-26 delivers the highest muzzle velocity at 3,146 fps; across all powders the maximum-charge window runs from 1,850 fps to 3,146 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2217 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, ReloadSwiss RS 70 rank at the top here: for .300 Weath. Mag. with the .308 | 170gr | Lapua Naturalis they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, ADI AR 2225, Baschieri & Pellagri 109 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.