Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 180gr | Sellier & Bellot FMJ-BT bullet and 78 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 Accurate MAGPRO.
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% | 54,244 psi | 85% | 2877 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 55,840 psi | 88% | 2913 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 56,507 psi | 89% | 3022 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 84% | 57,450 psi | 90% | 2881 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,695 psi | 89% | 2969 fps | 99% |
| ADI AR 2213 | <<locked>> | 96% | 54,433 psi | 85% | 2966 fps | 97.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,292 psi | 63% | 2746 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,172 psi | 86% | 2854 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,710 psi | 89% | 2972 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,056 psi | 85% | 2933 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,159 psi | 88% | 2956 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,114 psi | 85% | 2963 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,926 psi | 86% | 2940 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,691 psi | 79% | 2936 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,230 psi | 87% | 3028 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,666 psi | 89% | 3002 fps | 99.1% |
| Bofors RP3 | <<locked>> | 82% | 56,173 psi | 88% | 2871 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,528 psi | 73% | 2858 fps | 96.8% |
| Bofors RP5 | <<locked>> | 96% | 54,114 psi | 85% | 2963 fps | 98.9% |
| Bofors RP7 | <<locked>> | 86% | 55,172 psi | 86% | 2861 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,922 psi | 78% | 2881 fps | 97.7% |
| Hodgdon H380 | <<locked>> | 82% | 56,202 psi | 88% | 2887 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,740 psi | 90% | 2969 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 86% | 57,029 psi | 89% | 2927 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 94% | 54,346 psi | 85% | 2907 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 96% | 57,130 psi | 90% | 2949 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,884 psi | 89% | 2890 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,719 psi | 78% | 2992 fps | 99% |
| Hodgdon Superformance | <<locked>> | 86% | 54,288 psi | 85% | 2949 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,767 psi | 58% | 1811 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,811 psi | 89% | 2861 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,666 psi | 89% | 2900 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,739 psi | 89% | 2890 fps | 99.7% |
| IMR 4831 | <<locked>> | 90% | 56,275 psi | 88% | 2907 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,738 psi | 87% | 2894 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 98% | 55,782 psi | 87% | 3002 fps | 98.1% |
| Lovex S062 | <<locked>> | 82% | 57,334 psi | 90% | 2854 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,188 psi | 90% | 2887 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,303 psi | 87% | 2881 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,576 psi | 81% | 2835 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 57,522 psi | 90% | 2956 fps | 99% |
| Norma MRP | <<locked>> | 96% | 57,638 psi | 90% | 3048 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 54,476 psi | 85% | 2900 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,434 psi | 88% | 3022 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 90% | 56,753 psi | 89% | 2956 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,462 psi | 85% | 2953 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,681 psi | 59% | 1857 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,086 psi | 88% | 2877 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,421 psi | 90% | 2979 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,753 psi | 87% | 2936 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,099 psi | 85% | 2966 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,053 psi | 78% | 2986 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 56,449 psi | 88% | 2871 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,447 psi | 85% | 2877 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 94% | 55,521 psi | 87% | 2943 fps | 99% |
| Rottweil R 907 | <<locked>> | 86% | 55,172 psi | 86% | 2861 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,188 psi | 90% | 2887 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,334 psi | 90% | 2854 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,303 psi | 87% | 2881 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,360 psi | 85% | 2874 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,507 psi | 89% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,666 psi | 89% | 2841 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,071 psi | 86% | 2940 fps | 99% |
| Somchem S355 | <<locked>> | 84% | 56,043 psi | 88% | 2861 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,043 psi | 88% | 2874 fps | 97.4% |
| Somchem S365 | <<locked>> | 90% | 54,505 psi | 85% | 2904 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,086 psi | 88% | 2917 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 86% | 57,450 psi | 90% | 2838 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,217 psi | 88% | 2890 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,477 psi | 87% | 2894 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 88% | 55,492 psi | 87% | 2897 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 57,406 psi | 90% | 2969 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,609 psi | 90% | 3038 fps | 98% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,098 psi | 83% | 2949 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,956 psi | 88% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,186 psi | 85% | 2917 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,695 psi | 87% | 3074 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,188 psi | 88% | 2913 fps | 98.9% |
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% | 31,589 psi | 50% | 2425 fps | 95.2% |
| Accurate 4350 | <<locked>> | 80% | 42,612 psi | 67% | 2690 fps | 99.6% |
| Accurate MAGPRO | 79.1 gr | 92% | 49,124 psi | 77% | 2894 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 50,865 psi | 80% | 2779 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 40,669 psi | 64% | 2671 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 90% | 44,309 psi | 69% | 2776 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 96% | 35,375 psi | 55% | 2618 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,822 psi | 81% | 2802 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,915 psi | 64% | 2697 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,891 psi | 73% | 2818 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 40,625 psi | 64% | 2667 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 38,609 psi | 61% | 2661 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,371 psi | 48% | 2457 fps | 98.4% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,168 psi | 47% | 2467 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 80% | 32,750 psi | 51% | 2579 fps | 97.2% |
| Bofors RP15 | <<locked>> | 90% | 40,857 psi | 64% | 2713 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 52,634 psi | 82% | 2818 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 43,497 psi | 68% | 2799 fps | 95.9% |
| Bofors RP5 | <<locked>> | 86% | 38,609 psi | 61% | 2661 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 45,818 psi | 72% | 2697 fps | 98% |
| Hodgdon H1000 | <<locked>> | 96% | 43,685 psi | 68% | 2759 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 52,736 psi | 83% | 2835 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,367 psi | 70% | 2736 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 47,021 psi | 74% | 2756 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 90% | 47,471 psi | 74% | 2785 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 90% | 46,485 psi | 73% | 2766 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,580 psi | 60% | 2585 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 38,232 psi | 60% | 2726 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 43,453 psi | 68% | 2753 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,601 psi | 43% | 1621 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,534 psi | 84% | 2812 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,263 psi | 65% | 2625 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,152 psi | 74% | 2726 fps | 98.6% |
| IMR 4831 | <<locked>> | 80% | 40,727 psi | 64% | 2641 fps | 99.4% |
| IMR 4955 Enduron | <<locked>> | 88% | 46,253 psi | 72% | 2726 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 92% | 45,498 psi | 71% | 2812 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 53,867 psi | 84% | 2805 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,773 psi | 70% | 2677 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 43,033 psi | 67% | 2661 fps | 98.1% |
| Lovex S071 | <<locked>> | 86% | 32,953 psi | 52% | 2461 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 41,060 psi | 64% | 2657 fps | 95.6% |
| Norma MRP | 69.2 gr | 82% | 35,215 psi | 55% | 2608 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 41,974 psi | 66% | 2680 fps | 99.4% |
| Ramshot Grand | <<locked>> | 90% | 42,322 psi | 66% | 2759 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 40,799 psi | 64% | 2671 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 90% | 37,710 psi | 59% | 2635 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,137 psi | 44% | 1657 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,547 psi | 82% | 2818 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,763 psi | 78% | 2864 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,453 psi | 67% | 2710 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,785 psi | 64% | 2720 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 35,056 psi | 55% | 2641 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 49,617 psi | 78% | 2766 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 44,933 psi | 70% | 2710 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 84% | 39,871 psi | 62% | 2651 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 45,818 psi | 72% | 2697 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,773 psi | 70% | 2677 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 53,867 psi | 84% | 2805 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,033 psi | 67% | 2661 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,821 psi | 80% | 2822 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,125 psi | 79% | 2654 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,714 psi | 69% | 2621 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 39,523 psi | 62% | 2644 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 49,588 psi | 78% | 2762 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 46,093 psi | 72% | 2700 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 38,638 psi | 61% | 2635 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,505 psi | 56% | 2520 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 47,442 psi | 74% | 2687 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,410 psi | 68% | 2677 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 37,362 psi | 59% | 2559 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 42,815 psi | 67% | 2680 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 33,924 psi | 53% | 2533 fps | 98.4% |
| Vihtavuori N560 | 75.9 gr | 90% | 46,731 psi | 73% | 2848 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 96% | 46,354 psi | 73% | 2825 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,351 psi | 66% | 2641 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,367 psi | 70% | 2736 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,905 psi | 42% | 2448 fps | 98% |
| Winchester Supreme 780 | <<locked>> | 86% | 39,711 psi | 62% | 2615 fps | 95.3% |
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 85 powders for .300 Weath. Mag. loaded with the .308 | 180gr | Sellier & Bellot FMJ-BT. Winchester StaBALL HD delivers the highest muzzle velocity at 3,074 fps; across all powders the maximum-charge window runs from 1,811 fps to 3,074 fps. ADI AR 2217 gives the best case fill at 100 %, and 85 of the 85 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 180.0 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, Vihtavuori N560, Accurate MAGPRO rank at the top here: for .300 Weath. Mag. with the .308 | 180gr | Sellier & Bellot FMJ-BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, ReloadSwiss RS 80, 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.