Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 180gr | Speer Magnum Tip Soft Point bullet and 76 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Alliant Reloder-26.
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% | 55,941 psi | 88% | 2904 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 57,595 psi | 90% | 2943 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 54,273 psi | 85% | 2989 fps | 97% |
| ADI AR 2208 | <<locked>> | 82% | 55,245 psi | 87% | 2851 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 54,607 psi | 86% | 2940 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 96% | 55,782 psi | 87% | 2995 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,717 psi | 73% | 2822 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,437 psi | 65% | 2776 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,521 psi | 89% | 2877 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,491 psi | 85% | 2943 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,608 psi | 87% | 2959 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,580 psi | 90% | 2982 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,564 psi | 87% | 2992 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,753 psi | 89% | 2969 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,257 psi | 82% | 2966 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 57,377 psi | 90% | 3061 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 54,737 psi | 86% | 2976 fps | 98.9% |
| Bofors RP3 | <<locked>> | 82% | 57,522 psi | 90% | 2894 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,312 psi | 76% | 2897 fps | 97.4% |
| Bofors RP5 | <<locked>> | 96% | 55,564 psi | 87% | 2992 fps | 99.1% |
| Bofors RP7 | <<locked>> | 86% | 56,521 psi | 89% | 2890 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,503 psi | 81% | 2917 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 82% | 57,682 psi | 90% | 2913 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 55,637 psi | 87% | 2943 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 54,723 psi | 86% | 2897 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 94% | 55,985 psi | 88% | 2936 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,868 psi | 86% | 2920 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,984 psi | 86% | 2871 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,169 psi | 80% | 3022 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 86% | 55,825 psi | 87% | 2976 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,869 psi | 58% | 1821 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 54,534 psi | 85% | 2874 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,491 psi | 85% | 2858 fps | 99.6% |
| IMR 4831 | <<locked>> | 90% | 57,682 psi | 90% | 2933 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 57,058 psi | 89% | 2920 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 98% | 57,406 psi | 90% | 3031 fps | 98.5% |
| Lovex S065 | <<locked>> | 86% | 54,940 psi | 86% | 2858 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,652 psi | 89% | 2907 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,272 psi | 83% | 2864 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 55,187 psi | 86% | 2923 fps | 98.8% |
| Norma MRP | <<locked>> | 94% | 55,463 psi | 87% | 3015 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 55,941 psi | 88% | 2927 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,273 psi | 85% | 2992 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 88% | 54,621 psi | 86% | 2927 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,449 psi | 88% | 2989 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,768 psi | 59% | 1867 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,203 psi | 90% | 2897 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 55,143 psi | 86% | 2946 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,392 psi | 90% | 2966 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,680 psi | 87% | 2992 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,764 psi | 81% | 3022 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 82% | 54,070 psi | 85% | 2841 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,898 psi | 88% | 2907 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 94% | 57,058 psi | 89% | 2969 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 86% | 56,521 psi | 89% | 2890 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,940 psi | 86% | 2858 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,652 psi | 89% | 2907 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,622 psi | 87% | 2897 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,595 psi | 90% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,215 psi | 85% | 2808 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,594 psi | 89% | 2966 fps | 99.2% |
| Somchem S355 | <<locked>> | 84% | 57,348 psi | 90% | 2884 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,435 psi | 90% | 2900 fps | 97.8% |
| Somchem S365 | <<locked>> | 90% | 56,043 psi | 88% | 2927 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,725 psi | 90% | 2946 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 84% | 55,158 psi | 86% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,172 psi | 85% | 2864 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 57,029 psi | 89% | 2920 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 88% | 56,782 psi | 89% | 2923 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,434 psi | 87% | 2943 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 55,347 psi | 87% | 3005 fps | 97.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 55,085 psi | 86% | 2986 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 57,363 psi | 90% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,637 psi | 87% | 2943 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 53,882 psi | 84% | 3048 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 53,925 psi | 85% | 2884 fps | 98.8% |
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% | 32,518 psi | 51% | 2451 fps | 95.8% |
| Accurate 4350 | <<locked>> | 80% | 43,772 psi | 69% | 2717 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 90% | 47,181 psi | 74% | 2861 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 51,938 psi | 81% | 2802 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 39,117 psi | 61% | 2638 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 90% | 45,614 psi | 71% | 2808 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 98% | 43,801 psi | 69% | 2762 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 94% | 34,200 psi | 54% | 2589 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,953 psi | 83% | 2825 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,003 psi | 66% | 2723 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,428 psi | 76% | 2848 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,117 psi | 61% | 2638 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 86% | 39,813 psi | 62% | 2690 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,256 psi | 49% | 2484 fps | 98.7% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,154 psi | 49% | 2497 fps | 95.8% |
| Alliant Reloder-26 | 71.3 gr | 80% | 33,910 psi | 53% | 2612 fps | 97.8% |
| Bofors RP15 | <<locked>> | 88% | 39,465 psi | 62% | 2684 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 53,809 psi | 84% | 2841 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 42,206 psi | 66% | 2772 fps | 95.6% |
| Bofors RP5 | <<locked>> | 86% | 39,813 psi | 62% | 2690 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 46,818 psi | 73% | 2723 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 94% | 41,989 psi | 66% | 2726 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 54,027 psi | 85% | 2861 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,382 psi | 71% | 2762 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 80% | 48,037 psi | 75% | 2782 fps | 98% |
| Hodgdon H4831 | <<locked>> | 88% | 45,571 psi | 71% | 2753 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 47,848 psi | 75% | 2795 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,682 psi | 62% | 2612 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 39,392 psi | 62% | 2766 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 44,730 psi | 70% | 2782 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,586 psi | 43% | 1627 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,351 psi | 66% | 2654 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,095 psi | 75% | 2749 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 41,771 psi | 65% | 2664 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 44,411 psi | 70% | 2694 fps | 95% |
| IMR 7828 SSC | <<locked>> | 90% | 43,729 psi | 69% | 2782 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 45,774 psi | 72% | 2700 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 44,034 psi | 69% | 2687 fps | 98.4% |
| Lovex S071 | <<locked>> | 84% | 31,865 psi | 50% | 2434 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 42,148 psi | 66% | 2684 fps | 96.1% |
| Norma MRP | 70.9 gr | 82% | 36,245 psi | 57% | 2635 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 43,076 psi | 68% | 2707 fps | 99.6% |
| Ramshot Grand | <<locked>> | 90% | 43,613 psi | 68% | 2792 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 41,916 psi | 66% | 2697 fps | 98.5% |
| Ramshot Magnum | <<locked>> | 88% | 36,245 psi | 57% | 2602 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,282 psi | 44% | 1670 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,693 psi | 84% | 2844 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,401 psi | 81% | 2894 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,671 psi | 68% | 2736 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,843 psi | 66% | 2746 fps | 99.4% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 36,187 psi | 57% | 2677 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 50,778 psi | 80% | 2789 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 43,352 psi | 68% | 2680 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 82% | 38,421 psi | 60% | 2621 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 46,818 psi | 73% | 2723 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,774 psi | 72% | 2700 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 44,034 psi | 69% | 2687 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,083 psi | 82% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,053 psi | 80% | 2674 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,817 psi | 70% | 2648 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 38,072 psi | 60% | 2615 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 50,705 psi | 79% | 2785 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 47,123 psi | 74% | 2726 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 39,958 psi | 63% | 2664 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,405 psi | 57% | 2546 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 48,472 psi | 76% | 2707 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,454 psi | 70% | 2703 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 38,508 psi | 60% | 2585 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 43,932 psi | 69% | 2703 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 34,969 psi | 55% | 2559 fps | 98.7% |
| Vihtavuori N560 | 76.1 gr | 88% | 44,976 psi | 70% | 2815 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 94% | 44,730 psi | 70% | 2795 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,555 psi | 68% | 2667 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,585 psi | 71% | 2766 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,746 psi | 43% | 2480 fps | 98.6% |
| Winchester Supreme 780 | <<locked>> | 86% | 40,857 psi | 64% | 2644 fps | 95.9% |
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 82 powders for .300 Weath. Mag. loaded with the .308 | 180gr | Speer Magnum Tip Soft Point. Alliant Reloder-26 delivers the highest muzzle velocity at 3,061 fps; across all powders the maximum-charge window runs from 1,821 fps to 3,061 fps. ADI AR 2217 gives the best case fill at 100 %, and 82 of the 82 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 180.0 gr projectile in 0.308" calls for a 1:15.0 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, Vihtavuori N560, Alliant Reloder-26 rank at the top here: for .300 Weath. Mag. with the .308 | 180gr | Speer Magnum Tip Soft Point they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Baschieri & Pellagri 109, IMR 8133 Enduron, Vihtavuori N170 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.