Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 170gr | Geco PLUS bullet and 80 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% | 54,041 psi | 85% | 2953 fps | 99.8% |
| Accurate 4064 | <<locked>> | 82% | 57,740 psi | 90% | 2927 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,724 psi | 87% | 2995 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 56,347 psi | 88% | 3097 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 84% | 57,116 psi | 90% | 2959 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,463 psi | 88% | 3045 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 96% | 54,186 psi | 85% | 3038 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,103 psi | 63% | 2805 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,897 psi | 86% | 2933 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,420 psi | 88% | 3054 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,711 psi | 90% | 3071 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,883 psi | 88% | 3031 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,580 psi | 90% | 3097 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,737 psi | 86% | 3018 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,517 psi | 79% | 3012 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,955 psi | 86% | 3104 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,260 psi | 88% | 3074 fps | 98.8% |
| Bofors RP3 | <<locked>> | 82% | 55,941 psi | 88% | 2949 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,325 psi | 73% | 2930 fps | 96.3% |
| Bofors RP5 | <<locked>> | 98% | 57,580 psi | 90% | 3097 fps | 99% |
| Bofors RP7 | <<locked>> | 86% | 55,114 psi | 86% | 2943 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,864 psi | 78% | 2956 fps | 97.3% |
| Hodgdon H380 | <<locked>> | 82% | 55,956 psi | 88% | 2969 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,479 psi | 90% | 3048 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 86% | 56,782 psi | 89% | 3009 fps | 99% |
| Hodgdon H4831 | <<locked>> | 94% | 54,244 psi | 85% | 2982 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,884 psi | 89% | 3025 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,724 psi | 89% | 2972 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,472 psi | 78% | 3061 fps | 98.6% |
| Hodgdon Superformance | <<locked>> | 86% | 53,911 psi | 84% | 3022 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,840 psi | 58% | 1877 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,637 psi | 89% | 2943 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,275 psi | 88% | 2976 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,434 psi | 88% | 2966 fps | 99.5% |
| IMR 4831 | <<locked>> | 90% | 56,043 psi | 88% | 2986 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,550 psi | 87% | 2969 fps | 97.2% |
| IMR 7828 SSC | <<locked>> | 98% | 55,434 psi | 87% | 3074 fps | 97.7% |
| Lovex S062 | <<locked>> | 82% | 57,116 psi | 90% | 2936 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,043 psi | 89% | 2966 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,071 psi | 86% | 2956 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,488 psi | 81% | 2910 fps | 99.6% |
| Norma 204 | <<locked>> | 90% | 57,348 psi | 90% | 3035 fps | 98.7% |
| Norma MRP | <<locked>> | 96% | 57,392 psi | 90% | 3123 fps | 99.7% |
| Norma URP | <<locked>> | 90% | 57,682 psi | 90% | 3031 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,115 psi | 88% | 3094 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 56,579 psi | 89% | 3035 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,302 psi | 85% | 3028 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,507 psi | 59% | 1919 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,738 psi | 87% | 2953 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,305 psi | 90% | 3061 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,593 psi | 87% | 3018 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 53,838 psi | 84% | 3045 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,821 psi | 78% | 3054 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 84% | 55,999 psi | 88% | 2949 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,201 psi | 85% | 2953 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 94% | 55,245 psi | 87% | 3018 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 86% | 55,114 psi | 86% | 2943 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,043 psi | 89% | 2966 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,116 psi | 90% | 2936 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,071 psi | 86% | 2956 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,638 psi | 90% | 3005 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,376 psi | 88% | 2825 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,362 psi | 88% | 2917 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,795 psi | 86% | 3012 fps | 98.6% |
| Somchem S355 | <<locked>> | 84% | 55,883 psi | 88% | 2943 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,014 psi | 88% | 2949 fps | 97% |
| Somchem S365 | <<locked>> | 90% | 53,998 psi | 85% | 2979 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,970 psi | 88% | 2992 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 86% | 57,101 psi | 89% | 2913 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,086 psi | 88% | 2972 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,405 psi | 87% | 2969 fps | 99% |
| Vihtavuori N540 | <<locked>> | 82% | 57,711 psi | 90% | 2910 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 55,288 psi | 87% | 2976 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 57,087 psi | 89% | 3048 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,363 psi | 90% | 3117 fps | 97.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,924 psi | 83% | 3022 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,637 psi | 87% | 2933 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,711 psi | 90% | 3051 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,434 psi | 87% | 3153 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,898 psi | 88% | 2986 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% | 33,518 psi | 53% | 2543 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 54,360 psi | 85% | 2877 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 42,395 psi | 66% | 2762 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 92% | 48,834 psi | 77% | 2963 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 50,589 psi | 79% | 2858 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 43,294 psi | 68% | 2802 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 92% | 47,326 psi | 74% | 2910 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 98% | 37,594 psi | 59% | 2743 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,648 psi | 81% | 2881 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,625 psi | 64% | 2766 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,615 psi | 73% | 2894 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 40,393 psi | 63% | 2733 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 88% | 41,060 psi | 64% | 2789 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,139 psi | 47% | 2516 fps | 97.8% |
| Alliant Reloder-25 | <<locked>> | 86% | 32,039 psi | 50% | 2585 fps | 95.4% |
| Alliant Reloder-26 | 72.2 gr | 80% | 32,590 psi | 51% | 2638 fps | 96.6% |
| Bofors RP15 | <<locked>> | 90% | 40,567 psi | 64% | 2772 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 52,359 psi | 82% | 2897 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 43,453 psi | 68% | 2871 fps | 95.4% |
| Bofors RP5 | <<locked>> | 88% | 41,060 psi | 64% | 2789 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 45,513 psi | 71% | 2769 fps | 97.6% |
| Hodgdon H1000 | <<locked>> | 96% | 43,497 psi | 68% | 2825 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 52,431 psi | 82% | 2910 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,019 psi | 69% | 2808 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 80% | 46,804 psi | 73% | 2828 fps | 97.2% |
| Hodgdon H4831 | <<locked>> | 90% | 47,355 psi | 74% | 2854 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 92% | 49,676 psi | 78% | 2900 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,319 psi | 60% | 2654 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 94% | 40,509 psi | 63% | 2854 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 43,105 psi | 68% | 2822 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,499 psi | 43% | 1677 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,243 psi | 83% | 2890 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,104 psi | 64% | 2694 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,818 psi | 73% | 2795 fps | 98.3% |
| IMR 4831 | <<locked>> | 80% | 40,364 psi | 63% | 2707 fps | 99.1% |
| IMR 4955 Enduron | <<locked>> | 90% | 48,892 psi | 77% | 2851 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 92% | 45,353 psi | 71% | 2884 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 53,563 psi | 84% | 2884 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,469 psi | 70% | 2746 fps | 98.9% |
| Lovex S070 | <<locked>> | 80% | 42,728 psi | 67% | 2730 fps | 97.7% |
| Lovex S071 | <<locked>> | 86% | 32,851 psi | 51% | 2523 fps | 95.2% |
| Norma 204 | <<locked>> | 82% | 43,743 psi | 69% | 2785 fps | 95.9% |
| Norma MRP | 73.6 gr | 84% | 37,536 psi | 59% | 2736 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 41,655 psi | 65% | 2746 fps | 99.2% |
| Ramshot Grand | <<locked>> | 92% | 45,179 psi | 71% | 2890 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 40,437 psi | 63% | 2736 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 92% | 40,321 psi | 63% | 2762 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,166 psi | 44% | 1719 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,301 psi | 82% | 2897 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,458 psi | 78% | 2946 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,206 psi | 66% | 2779 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,480 psi | 63% | 2785 fps | 98.7% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 37,420 psi | 59% | 2769 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 49,211 psi | 77% | 2841 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 44,831 psi | 70% | 2779 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 84% | 39,653 psi | 62% | 2717 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 45,513 psi | 71% | 2769 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,469 psi | 70% | 2746 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 53,563 psi | 84% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,728 psi | 67% | 2730 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,473 psi | 79% | 2897 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,777 psi | 78% | 2730 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,511 psi | 68% | 2690 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 41,916 psi | 66% | 2769 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 49,284 psi | 77% | 2838 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 49,008 psi | 77% | 2828 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 38,435 psi | 60% | 2707 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 37,710 psi | 59% | 2641 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 47,094 psi | 74% | 2762 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,178 psi | 68% | 2749 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 88% | 39,798 psi | 62% | 2680 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 54,172 psi | 85% | 2861 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,496 psi | 67% | 2746 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 33,634 psi | 53% | 2595 fps | 97.8% |
| Vihtavuori N560 | 78.8 gr | 90% | 46,485 psi | 73% | 2917 fps | 95% |
| Vihtavuori N565 | <<locked>> | 96% | 46,224 psi | 72% | 2897 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,206 psi | 66% | 2713 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,208 psi | 69% | 2812 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,672 psi | 42% | 2497 fps | 97.1% |
| Winchester Supreme 780 | <<locked>> | 88% | 42,424 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 86 powders for .300 Weath. Mag. loaded with the .308 | 170gr | Geco PLUS. Winchester StaBALL HD delivers the highest muzzle velocity at 3,153 fps; across all powders the maximum-charge window runs from 1,877 fps to 3,153 fps. ADI AR 2217 gives the best case fill at 100 %, and 86 of the 86 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.308" calls for a 1:15.5 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. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for .300 Weath. Mag. with the .308 | 170gr | Geco PLUS they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Baschieri & Pellagri 109, IMR 8133 Enduron, 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.