Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 170gr | Speer Hot-Cor bullet and 83 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 2700 | <<locked>> | 82% | 57,377 psi | 90% | 2940 fps | 99.3% |
| Accurate 3100 | <<locked>> | 98% | 57,261 psi | 90% | 2999 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 57,392 psi | 90% | 2920 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,172 psi | 86% | 2986 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 55,767 psi | 87% | 3084 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 84% | 56,884 psi | 89% | 2956 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 55,811 psi | 87% | 3031 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 98% | 57,435 psi | 90% | 3094 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,682 psi | 62% | 2795 fps | 96.8% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,999 psi | 88% | 3028 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,404 psi | 85% | 2923 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 55,898 psi | 88% | 3045 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,232 psi | 90% | 3061 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,274 psi | 87% | 3018 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,014 psi | 89% | 3087 fps | 98.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 57,653 psi | 90% | 3061 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,951 psi | 78% | 3002 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,273 psi | 85% | 3094 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,637 psi | 87% | 3064 fps | 98.7% |
| Bofors RP3 | <<locked>> | 82% | 55,405 psi | 87% | 2943 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 45,759 psi | 72% | 2917 fps | 96% |
| Bofors RP5 | <<locked>> | 98% | 57,014 psi | 89% | 3087 fps | 98.9% |
| Bofors RP7 | <<locked>> | 86% | 54,665 psi | 86% | 2933 fps | 99.1% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,371 psi | 77% | 2943 fps | 97.1% |
| Hodgdon H380 | <<locked>> | 82% | 55,492 psi | 87% | 2959 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,072 psi | 89% | 3041 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 86% | 56,347 psi | 88% | 2995 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 96% | 57,435 psi | 90% | 3031 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,304 psi | 88% | 3015 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,202 psi | 88% | 2966 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,936 psi | 77% | 3048 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 88% | 57,537 psi | 90% | 3077 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,695 psi | 57% | 1870 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,347 psi | 88% | 2936 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,883 psi | 88% | 2969 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,999 psi | 88% | 2956 fps | 99.5% |
| IMR 4831 | <<locked>> | 90% | 55,390 psi | 87% | 2976 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 54,984 psi | 86% | 2956 fps | 97% |
| IMR 7828 SSC | <<locked>> | 98% | 54,824 psi | 86% | 3061 fps | 97.6% |
| Lovex S062 | <<locked>> | 82% | 56,594 psi | 89% | 2927 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,594 psi | 89% | 2956 fps | 99.9% |
| Lovex S070 | <<locked>> | 88% | 54,636 psi | 86% | 2949 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,879 psi | 80% | 2897 fps | 99.5% |
| Norma 203B | <<locked>> | 82% | 57,479 psi | 90% | 2986 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,956 psi | 89% | 3025 fps | 98.6% |
| Norma MRP | <<locked>> | 96% | 56,753 psi | 89% | 3110 fps | 99.7% |
| Norma URP | <<locked>> | 90% | 57,232 psi | 90% | 3025 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,521 psi | 87% | 3084 fps | 98% |
| Ramshot Hunter | <<locked>> | 90% | 56,188 psi | 88% | 3028 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,751 psi | 84% | 3018 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,550 psi | 59% | 1916 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,288 psi | 87% | 2943 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,536 psi | 89% | 3051 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,129 psi | 86% | 3009 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,203 psi | 90% | 3094 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,327 psi | 77% | 3045 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 84% | 55,709 psi | 87% | 2943 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,261 psi | 90% | 3002 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 94% | 54,839 psi | 86% | 3009 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 86% | 54,665 psi | 86% | 2933 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,594 psi | 89% | 2956 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 56,594 psi | 89% | 2927 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 54,636 psi | 86% | 2949 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,159 psi | 90% | 2999 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,898 psi | 88% | 2818 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,956 psi | 88% | 2907 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,389 psi | 85% | 3002 fps | 98.5% |
| Somchem S355 | <<locked>> | 84% | 55,419 psi | 87% | 2933 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,492 psi | 87% | 2936 fps | 96.9% |
| Somchem S365 | <<locked>> | 92% | 57,334 psi | 90% | 3028 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,390 psi | 87% | 2982 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 86% | 56,637 psi | 89% | 2907 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,651 psi | 87% | 2963 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 54,810 psi | 86% | 2959 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 57,232 psi | 90% | 2904 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 54,679 psi | 86% | 2966 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,608 psi | 89% | 3038 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 56,753 psi | 89% | 3104 fps | 97.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,373 psi | 82% | 3009 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,056 psi | 86% | 2920 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,072 psi | 89% | 3041 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 54,650 psi | 86% | 3143 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,303 psi | 87% | 2976 fps | 98.5% |
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% | 53,824 psi | 84% | 2884 fps | 98.9% |
| Accurate 3100 | <<locked>> | 82% | 33,286 psi | 52% | 2533 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 53,766 psi | 84% | 2867 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,887 psi | 66% | 2749 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 94% | 51,851 psi | 81% | 3018 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 50,140 psi | 79% | 2848 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 42,902 psi | 67% | 2789 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 92% | 46,789 psi | 73% | 2900 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 98% | 37,173 psi | 58% | 2730 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 43,221 psi | 68% | 2792 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,169 psi | 80% | 2874 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,321 psi | 63% | 2759 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,296 psi | 73% | 2887 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 42,757 psi | 67% | 2782 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 40,683 psi | 64% | 2779 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,776 psi | 47% | 2503 fps | 97.7% |
| Alliant Reloder-25 | <<locked>> | 86% | 31,720 psi | 50% | 2575 fps | 95.2% |
| Alliant Reloder-26 | 71.6 gr | 80% | 32,227 psi | 51% | 2625 fps | 96.3% |
| Bofors RP15 | <<locked>> | 92% | 42,960 psi | 67% | 2828 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 51,866 psi | 81% | 2887 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 42,888 psi | 67% | 2854 fps | 95.1% |
| Bofors RP5 | <<locked>> | 88% | 40,683 psi | 64% | 2779 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 45,266 psi | 71% | 2762 fps | 97.5% |
| Hodgdon H1000 | <<locked>> | 96% | 43,004 psi | 67% | 2808 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 51,953 psi | 81% | 2900 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 43,598 psi | 68% | 2795 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 80% | 46,325 psi | 73% | 2815 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 92% | 50,082 psi | 78% | 2907 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 49,124 psi | 77% | 2887 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,869 psi | 59% | 2641 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 94% | 40,161 psi | 63% | 2844 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 42,714 psi | 67% | 2812 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,441 psi | 43% | 1673 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,750 psi | 83% | 2881 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,683 psi | 64% | 2684 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,586 psi | 73% | 2789 fps | 98.2% |
| IMR 4831 | <<locked>> | 80% | 40,089 psi | 63% | 2700 fps | 99% |
| IMR 4955 Enduron | <<locked>> | 90% | 48,559 psi | 76% | 2841 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 94% | 48,008 psi | 75% | 2936 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 53,243 psi | 83% | 2877 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,063 psi | 69% | 2736 fps | 98.8% |
| Lovex S070 | <<locked>> | 80% | 42,453 psi | 67% | 2723 fps | 97.5% |
| Lovex S071 | <<locked>> | 86% | 32,445 psi | 51% | 2513 fps | 95% |
| Norma 203B | <<locked>> | 80% | 53,882 psi | 84% | 2933 fps | 100% |
| Norma 204 | <<locked>> | 82% | 43,337 psi | 68% | 2776 fps | 95.7% |
| Norma MRP | 73 gr | 84% | 37,173 psi | 58% | 2726 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 41,350 psi | 65% | 2740 fps | 99.1% |
| Ramshot Grand | <<locked>> | 92% | 44,628 psi | 70% | 2877 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 40,219 psi | 63% | 2730 fps | 97.6% |
| Ramshot Magnum | <<locked>> | 92% | 39,842 psi | 62% | 2749 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,108 psi | 44% | 1716 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,909 psi | 81% | 2887 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,139 psi | 77% | 2940 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,742 psi | 65% | 2769 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,074 psi | 63% | 2776 fps | 98.6% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 36,985 psi | 58% | 2756 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 48,936 psi | 77% | 2835 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 44,469 psi | 70% | 2772 fps | 95% |
| Rottweil R 905 | <<locked>> | 86% | 41,887 psi | 66% | 2762 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 45,266 psi | 71% | 2762 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,063 psi | 69% | 2736 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 53,243 psi | 83% | 2877 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,453 psi | 67% | 2723 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,183 psi | 79% | 2890 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,501 psi | 78% | 2726 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,149 psi | 68% | 2680 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 41,539 psi | 65% | 2759 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 48,791 psi | 76% | 2828 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 48,501 psi | 76% | 2818 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 37,927 psi | 59% | 2694 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 37,304 psi | 58% | 2631 fps | 95.1% |
| Vihtavuori N150 | <<locked>> | 80% | 46,818 psi | 73% | 2756 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,714 psi | 67% | 2740 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 39,392 psi | 62% | 2674 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 53,722 psi | 84% | 2854 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,076 psi | 66% | 2736 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 33,330 psi | 52% | 2585 fps | 97.7% |
| Vihtavuori N560 | 79.9 gr | 92% | 49,342 psi | 77% | 2969 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 96% | 45,658 psi | 72% | 2884 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,829 psi | 66% | 2707 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,743 psi | 69% | 2799 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,455 psi | 41% | 2487 fps | 96.9% |
| Winchester Supreme 780 | <<locked>> | 88% | 41,887 psi | 66% | 2730 fps | 95.5% |
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 | 170gr | Speer Hot-Cor. Winchester StaBALL HD delivers the highest muzzle velocity at 3,143 fps; across all powders the maximum-charge window runs from 1,870 fps to 3,143 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 57–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.308" calls for a 1:14.5 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. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for .300 Weath. Mag. with the .308 | 170gr | Speer Hot-Cor 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.