Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 180gr | Sierra Pro-Hunter bullet and 85 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-26 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.
A valid access license is required to use the Personalized Load Calculator.
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>> | 84% | 53,243 psi | 85% | 2756 fps | 98.8% |
| Accurate 3100 | <<locked>> | 98% | 54,302 psi | 87% | 2851 fps | 99.8% |
| Accurate 4064 | <<locked>> | 82% | 55,317 psi | 89% | 2785 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,246 psi | 90% | 2897 fps | 100% |
| ADI AR 2208 | <<locked>> | 84% | 55,027 psi | 88% | 2818 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 53,505 psi | 86% | 2887 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 98% | 54,665 psi | 88% | 2940 fps | 97.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,927 psi | 90% | 2838 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,999 psi | 90% | 2861 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 53,316 psi | 85% | 2897 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 54,563 psi | 87% | 2920 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 52,808 psi | 85% | 2874 fps | 98.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 53,969 psi | 87% | 2936 fps | 98.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,810 psi | 88% | 2920 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,384 psi | 76% | 2854 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,795 psi | 88% | 3002 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,924 psi | 85% | 2917 fps | 98.3% |
| Bofors RP3 | <<locked>> | 82% | 53,272 psi | 85% | 2805 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 53,969 psi | 87% | 2936 fps | 98.6% |
| Bofors RP7 | <<locked>> | 88% | 55,898 psi | 90% | 2844 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 82% | 53,563 psi | 86% | 2822 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 55,637 psi | 89% | 2910 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 90% | 56,028 psi | 90% | 2884 fps | 98.9% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 53,983 psi | 87% | 2871 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 96% | 53,737 psi | 86% | 2867 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 53,635 psi | 86% | 2825 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,201 psi | 89% | 2858 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,340 psi | 74% | 2894 fps | 97.8% |
| Hodgdon Superformance | <<locked>> | 88% | 54,795 psi | 88% | 2933 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,564 psi | 59% | 1778 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,534 psi | 87% | 2808 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 53,969 psi | 87% | 2792 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,999 psi | 90% | 2825 fps | 99.5% |
| IMR 4350 | <<locked>> | 90% | 53,664 psi | 86% | 2828 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,215 psi | 87% | 2818 fps | 99.3% |
| IMR 4831 | <<locked>> | 94% | 54,099 psi | 87% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,333 psi | 90% | 2871 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 98% | 56,260 psi | 90% | 2979 fps | 97.8% |
| Lovex S062 | <<locked>> | 82% | 54,665 psi | 88% | 2792 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,375 psi | 87% | 2818 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 55,898 psi | 90% | 2864 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,385 psi | 78% | 2759 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 55,332 psi | 89% | 2844 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,302 psi | 87% | 2877 fps | 98.3% |
| Norma MRP | <<locked>> | 96% | 53,505 psi | 86% | 2959 fps | 99.4% |
| Norma URP | <<locked>> | 90% | 54,897 psi | 88% | 2884 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,217 psi | 90% | 2874 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 56,130 psi | 90% | 2986 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 90% | 53,476 psi | 86% | 2881 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 98% | 52,692 psi | 84% | 2900 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,289 psi | 60% | 1821 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 53,287 psi | 85% | 2805 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,012 psi | 87% | 2910 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,159 psi | 90% | 2920 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,491 psi | 87% | 2949 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,470 psi | 75% | 2890 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 84% | 53,359 psi | 86% | 2802 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,940 psi | 88% | 2858 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 96% | 55,695 psi | 89% | 2920 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 88% | 55,898 psi | 90% | 2844 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,375 psi | 87% | 2818 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 54,665 psi | 88% | 2792 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,898 psi | 90% | 2864 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,853 psi | 88% | 2858 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,215 psi | 87% | 2687 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 53,838 psi | 86% | 2769 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,230 psi | 89% | 2913 fps | 98.7% |
| Somchem S355 | <<locked>> | 84% | 53,287 psi | 85% | 2795 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 53,098 psi | 85% | 2795 fps | 96.4% |
| Somchem S365 | <<locked>> | 92% | 54,346 psi | 87% | 2881 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 52,779 psi | 85% | 2838 fps | 98.9% |
| Unknown powder | <<locked>> | 88% | 55,332 psi | 89% | 2884 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,405 psi | 90% | 2766 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,969 psi | 88% | 2782 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,738 psi | 89% | 2854 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,795 psi | 86% | 2841 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 82% | 56,130 psi | 90% | 2792 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 56,057 psi | 90% | 2900 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 53,563 psi | 86% | 2890 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,215 psi | 87% | 2959 fps | 97% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,443 psi | 79% | 2861 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,376 psi | 90% | 2838 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,637 psi | 89% | 2910 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,517 psi | 81% | 2989 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,288 psi | 87% | 2858 fps | 98.4% |
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% | 46,717 psi | 75% | 2644 fps | 97.7% |
| Accurate 3100 | <<locked>> | 84% | 33,750 psi | 54% | 2464 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 51,938 psi | 83% | 2736 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,001 psi | 64% | 2618 fps | 99% |
| ADI AR 2208 | <<locked>> | 80% | 48,559 psi | 78% | 2713 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 41,104 psi | 66% | 2654 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 94% | 47,761 psi | 77% | 2815 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,298 psi | 79% | 2736 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,620 psi | 84% | 2808 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,624 psi | 62% | 2625 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,106 psi | 71% | 2749 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 40,973 psi | 66% | 2651 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 90% | 41,205 psi | 66% | 2697 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,529 psi | 46% | 2385 fps | 97.3% |
| Alliant Reloder-25 | <<locked>> | 88% | 32,256 psi | 52% | 2503 fps | 95.7% |
| Alliant Reloder-26 | 65.5 gr | 80% | 30,589 psi | 49% | 2497 fps | 95.7% |
| Bofors RP15 | <<locked>> | 92% | 40,799 psi | 65% | 2687 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 49,980 psi | 80% | 2753 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 41,205 psi | 66% | 2697 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 43,700 psi | 70% | 2628 fps | 97.2% |
| Hodgdon H380 | <<locked>> | 80% | 50,067 psi | 80% | 2766 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 45,382 psi | 73% | 2736 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 41,104 psi | 66% | 2612 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 96% | 47,340 psi | 76% | 2756 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 94% | 50,111 psi | 80% | 2805 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,260 psi | 58% | 2516 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,590 psi | 83% | 2805 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 40,814 psi | 65% | 2766 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 40,727 psi | 65% | 2674 fps | 96.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,383 psi | 44% | 1588 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,198 psi | 82% | 2756 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,703 psi | 76% | 2690 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,688 psi | 75% | 2664 fps | 98.3% |
| IMR 4350 | <<locked>> | 80% | 39,262 psi | 63% | 2556 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,063 psi | 72% | 2657 fps | 97.9% |
| IMR 4831 | <<locked>> | 80% | 34,795 psi | 56% | 2487 fps | 97.9% |
| IMR 4955 Enduron | <<locked>> | 90% | 46,586 psi | 75% | 2703 fps | 95% |
| IMR 7828 SSC | <<locked>> | 92% | 45,788 psi | 73% | 2792 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 51,343 psi | 82% | 2743 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,627 psi | 68% | 2608 fps | 98.6% |
| Lovex S070 | <<locked>> | 80% | 40,770 psi | 65% | 2589 fps | 97.2% |
| Lovex S071 | <<locked>> | 88% | 32,851 psi | 53% | 2441 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 51,967 psi | 83% | 2795 fps | 100% |
| Norma 204 | <<locked>> | 82% | 41,408 psi | 66% | 2641 fps | 95.3% |
| Norma MRP | 68.3 gr | 86% | 37,797 psi | 61% | 2651 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 39,523 psi | 63% | 2608 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 80% | 52,634 psi | 84% | 2818 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 44,904 psi | 72% | 2785 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 38,435 psi | 62% | 2598 fps | 97.2% |
| Ramshot Magnum | <<locked>> | 90% | 38,972 psi | 62% | 2638 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,934 psi | 45% | 1627 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,879 psi | 80% | 2746 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,833 psi | 75% | 2799 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,740 psi | 64% | 2635 fps | 98.8% |
| ReloadSwiss RS 70 | 64.9 gr | 80% | 38,421 psi | 62% | 2644 fps | 98.3% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 37,623 psi | 60% | 2684 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 46,934 psi | 75% | 2697 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 45,411 psi | 73% | 2690 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 86% | 40,089 psi | 64% | 2635 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 43,700 psi | 70% | 2628 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,627 psi | 68% | 2608 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 51,343 psi | 82% | 2743 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,770 psi | 65% | 2589 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,167 psi | 77% | 2753 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,906 psi | 77% | 2598 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,597 psi | 67% | 2552 fps | 97.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 39,726 psi | 64% | 2628 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 47,181 psi | 76% | 2697 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 49,734 psi | 80% | 2740 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 36,187 psi | 58% | 2569 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 38,043 psi | 61% | 2559 fps | 95.5% |
| Unknown powder | <<locked>> | 80% | 42,540 psi | 68% | 2664 fps | 99% |
| Vihtavuori N140 | <<locked>> | 80% | 52,982 psi | 85% | 2720 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,393 psi | 65% | 2543 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,569 psi | 68% | 2638 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 90% | 38,870 psi | 62% | 2569 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 52,765 psi | 85% | 2746 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 43,192 psi | 69% | 2680 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 31,676 psi | 51% | 2461 fps | 97.4% |
| Vihtavuori N560 | <<locked>> | 94% | 47,384 psi | 76% | 2838 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 98% | 46,122 psi | 74% | 2799 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,929 psi | 64% | 2575 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 45,382 psi | 73% | 2736 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,208 psi | 40% | 2359 fps | 96.2% |
| Winchester Supreme 780 | <<locked>> | 86% | 40,828 psi | 65% | 2618 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 | Sierra Pro-Hunter. Alliant Reloder-26 delivers the highest muzzle velocity at 3,002 fps; across all powders the maximum-charge window runs from 1,778 fps to 3,002 fps. Alliant Reloder-23 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 1:16.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, Bofors RP15 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, Alliant Reloder-26, ReloadSwiss RS 70 rank at the top here: for .300 Win. Mag. with the .308 | 180gr | Sierra Pro-Hunter 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.