Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 180gr | Prvi Partizan SP bullet and 85 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 2700 | <<locked>> | 82% | 54,244 psi | 87% | 2776 fps | 98.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,260 psi | 90% | 2874 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 53,795 psi | 86% | 2759 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,636 psi | 88% | 2867 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 54,563 psi | 87% | 2959 fps | 96.3% |
| ADI AR 2208 | <<locked>> | 84% | 53,708 psi | 86% | 2792 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,579 psi | 89% | 2917 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 98% | 53,055 psi | 85% | 2904 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,549 psi | 87% | 2812 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,853 psi | 88% | 2838 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,317 psi | 89% | 2923 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 52,982 psi | 85% | 2894 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,969 psi | 88% | 2904 fps | 98.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,898 psi | 90% | 2959 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,881 psi | 85% | 2890 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,876 psi | 74% | 2822 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 52,924 psi | 85% | 2972 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,213 psi | 82% | 2884 fps | 97.8% |
| Bofors RP3 | <<locked>> | 84% | 55,405 psi | 89% | 2828 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,898 psi | 90% | 2959 fps | 98.7% |
| Bofors RP7 | <<locked>> | 88% | 54,766 psi | 88% | 2818 fps | 99% |
| Hodgdon H380 | <<locked>> | 84% | 55,724 psi | 89% | 2848 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 53,069 psi | 85% | 2864 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 88% | 56,275 psi | 90% | 2881 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 96% | 53,287 psi | 85% | 2851 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,767 psi | 89% | 2890 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,724 psi | 89% | 2848 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,933 psi | 72% | 2854 fps | 97.2% |
| Hodgdon Superformance | <<locked>> | 88% | 53,026 psi | 85% | 2897 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,550 psi | 59% | 1768 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 53,258 psi | 85% | 2772 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,680 psi | 89% | 2808 fps | 99.4% |
| IMR 4350 | <<locked>> | 92% | 55,767 psi | 89% | 2854 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,246 psi | 90% | 2844 fps | 99.4% |
| IMR 4831 | <<locked>> | 92% | 54,940 psi | 88% | 2858 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,289 psi | 90% | 2864 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,984 psi | 88% | 2841 fps | 96.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,143 psi | 87% | 2936 fps | 97.3% |
| Lovex S062 | <<locked>> | 82% | 53,505 psi | 86% | 2769 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,420 psi | 90% | 2841 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 54,534 psi | 87% | 2835 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,833 psi | 75% | 2730 fps | 99% |
| Norma 203B | <<locked>> | 82% | 54,143 psi | 87% | 2822 fps | 100% |
| Norma 204 | <<locked>> | 90% | 53,026 psi | 85% | 2848 fps | 97.9% |
| Norma MRP | <<locked>> | 98% | 55,593 psi | 89% | 2989 fps | 99.5% |
| Norma URP | <<locked>> | 90% | 53,374 psi | 86% | 2854 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,752 psi | 88% | 2848 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,723 psi | 88% | 2956 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 92% | 55,608 psi | 89% | 2907 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,820 psi | 78% | 2828 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,289 psi | 60% | 1811 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,695 psi | 89% | 2835 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,275 psi | 90% | 2936 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,520 psi | 87% | 2894 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 52,924 psi | 85% | 2917 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,005 psi | 72% | 2851 fps | 98.3% |
| Rottweil R 902 | <<locked>> | 82% | 55,434 psi | 89% | 2779 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,521 psi | 89% | 2825 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 53,708 psi | 86% | 2831 fps | 97.1% |
| Rottweil R 905 | <<locked>> | 96% | 54,114 psi | 87% | 2887 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 54,766 psi | 88% | 2818 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,420 psi | 90% | 2841 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 53,505 psi | 86% | 2769 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,534 psi | 87% | 2835 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 53,592 psi | 86% | 2835 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 53,113 psi | 85% | 2667 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,043 psi | 90% | 2792 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 53,650 psi | 86% | 2881 fps | 98.3% |
| Somchem S355 | <<locked>> | 86% | 55,405 psi | 89% | 2822 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,216 psi | 89% | 2822 fps | 96.6% |
| Somchem S365 | <<locked>> | 92% | 52,750 psi | 85% | 2858 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,737 psi | 88% | 2864 fps | 99% |
| Vihtavuori N135 | <<locked>> | 82% | 55,912 psi | 90% | 2740 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,956 psi | 90% | 2753 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 53,200 psi | 85% | 2749 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,361 psi | 89% | 2848 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,027 psi | 87% | 2838 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 82% | 54,157 psi | 87% | 2749 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,592 psi | 88% | 2854 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,419 psi | 89% | 2913 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,825 psi | 90% | 2976 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,955 psi | 88% | 2815 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 53,316 psi | 85% | 2867 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,167 psi | 77% | 2953 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,853 psi | 88% | 2858 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 2700 | <<locked>> | 80% | 50,908 psi | 82% | 2720 fps | 98.3% |
| Accurate 3100 | <<locked>> | 84% | 32,677 psi | 52% | 2431 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 50,618 psi | 81% | 2713 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,856 psi | 62% | 2589 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 96% | 50,763 psi | 81% | 2894 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 47,456 psi | 76% | 2687 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 42,801 psi | 69% | 2684 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 94% | 46,456 psi | 74% | 2782 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,167 psi | 77% | 2713 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,474 psi | 83% | 2782 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,594 psi | 60% | 2595 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,859 psi | 69% | 2720 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,424 psi | 68% | 2674 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 90% | 40,030 psi | 64% | 2667 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,731 psi | 44% | 2356 fps | 96.8% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,430 psi | 50% | 2474 fps | 95% |
| Alliant Reloder-26 | 63.8 gr | 80% | 29,530 psi | 47% | 2461 fps | 95% |
| Bofors RP15 | <<locked>> | 94% | 42,177 psi | 68% | 2713 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 48,588 psi | 78% | 2726 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 40,030 psi | 64% | 2667 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 42,685 psi | 68% | 2602 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 80% | 48,965 psi | 79% | 2740 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 40,669 psi | 65% | 2631 fps | 96.9% |
| Hodgdon H4350 | <<locked>> | 80% | 43,540 psi | 70% | 2654 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 94% | 49,850 psi | 80% | 2792 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 48,718 psi | 78% | 2772 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,172 psi | 56% | 2490 fps | 99.2% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,479 psi | 63% | 2723 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 39,552 psi | 63% | 2641 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 44% | 1578 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,908 psi | 80% | 2723 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,272 psi | 84% | 2756 fps | 99% |
| IMR 4350 | <<locked>> | 80% | 38,334 psi | 61% | 2530 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,077 psi | 71% | 2631 fps | 97.6% |
| IMR 4831 | <<locked>> | 80% | 37,275 psi | 60% | 2539 fps | 98.4% |
| IMR 4895 | <<locked>> | 80% | 52,765 psi | 85% | 2812 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,428 psi | 78% | 2730 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 96% | 47,514 psi | 76% | 2818 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 50,372 psi | 81% | 2720 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,597 psi | 67% | 2582 fps | 98.2% |
| Lovex S070 | <<locked>> | 80% | 39,769 psi | 64% | 2562 fps | 96.8% |
| Lovex S071 | <<locked>> | 90% | 34,055 psi | 55% | 2467 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 50,807 psi | 81% | 2769 fps | 100% |
| Norma 204 | <<locked>> | 84% | 43,294 psi | 69% | 2674 fps | 95.7% |
| Norma MRP | 66.6 gr | 86% | 36,637 psi | 59% | 2618 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 38,450 psi | 62% | 2579 fps | 98.5% |
| Ramshot Big Game | <<locked>> | 80% | 51,300 psi | 82% | 2795 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 44,222 psi | 71% | 2762 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 37,304 psi | 60% | 2566 fps | 96.7% |
| Ramshot Magnum | <<locked>> | 94% | 39,247 psi | 63% | 2638 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,862 psi | 45% | 1617 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,892 psi | 78% | 2723 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,498 psi | 73% | 2772 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,508 psi | 62% | 2605 fps | 98.4% |
| ReloadSwiss RS 70 | 63.3 gr | 80% | 37,405 psi | 60% | 2615 fps | 97.9% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,463 psi | 58% | 2644 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 51,996 psi | 83% | 2726 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,745 psi | 73% | 2674 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 47,340 psi | 76% | 2720 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 88% | 41,524 psi | 67% | 2657 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 42,685 psi | 68% | 2602 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,597 psi | 67% | 2582 fps | 98.2% |
| Shooters World Precision | <<locked>> | 80% | 50,372 psi | 81% | 2720 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,769 psi | 64% | 2562 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,876 psi | 75% | 2726 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,963 psi | 75% | 2579 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,698 psi | 65% | 2526 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 41,147 psi | 66% | 2651 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 46,050 psi | 74% | 2674 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,515 psi | 78% | 2710 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 35,070 psi | 56% | 2539 fps | 99.9% |
| Somchem S385 | <<locked>> | 86% | 39,523 psi | 63% | 2585 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 80% | 52,547 psi | 84% | 2694 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,489 psi | 84% | 2703 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,888 psi | 70% | 2598 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,943 psi | 64% | 2582 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 90% | 38,899 psi | 62% | 2566 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 50,850 psi | 82% | 2700 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,392 psi | 63% | 2582 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 30,618 psi | 49% | 2431 fps | 96.8% |
| Vihtavuori N560 | <<locked>> | 94% | 48,646 psi | 78% | 2854 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,972 psi | 62% | 2549 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 40,828 psi | 65% | 2638 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,468 psi | 39% | 2323 fps | 95.3% |
| Winchester Supreme 780 | <<locked>> | 90% | 41,539 psi | 67% | 2625 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 Win. Mag. loaded with the .308 | 180gr | Prvi Partizan SP. Norma MRP delivers the highest muzzle velocity at 2,989 fps; across all powders the maximum-charge window runs from 1,768 fps to 2,989 fps. Accurate 3100 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 (430 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, Alliant Reloder-23 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 Win. Mag. with the .308 | 180gr | Prvi Partizan SP 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.