Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 180gr | Sako Hammerhead 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, 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.
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>> | 82% | 54,781 psi | 88% | 2785 fps | 98.9% |
| Accurate 3100 | <<locked>> | 98% | 53,272 psi | 85% | 2835 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 54,491 psi | 87% | 2769 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,230 psi | 89% | 2881 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 55,477 psi | 89% | 2976 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 84% | 54,302 psi | 87% | 2805 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,057 psi | 90% | 2927 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 98% | 53,737 psi | 86% | 2920 fps | 97.1% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 56,217 psi | 90% | 2923 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,172 psi | 88% | 2825 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,259 psi | 89% | 2844 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,941 psi | 90% | 2936 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 53,606 psi | 86% | 2904 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,448 psi | 89% | 2913 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 52,939 psi | 85% | 2917 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,664 psi | 86% | 2900 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,470 psi | 75% | 2835 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,664 psi | 86% | 2986 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,909 psi | 83% | 2897 fps | 98% |
| Bofors RP3 | <<locked>> | 84% | 56,043 psi | 90% | 2841 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 52,939 psi | 85% | 2917 fps | 98.3% |
| Bofors RP7 | <<locked>> | 88% | 55,288 psi | 89% | 2828 fps | 99.1% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,238 psi | 74% | 2776 fps | 96.1% |
| Hodgdon H380 | <<locked>> | 84% | 56,304 psi | 90% | 2858 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 53,853 psi | 86% | 2881 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 86% | 53,301 psi | 85% | 2835 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 96% | 53,954 psi | 87% | 2864 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,434 psi | 90% | 2904 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,289 psi | 90% | 2858 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,469 psi | 73% | 2867 fps | 97.5% |
| Hodgdon Superformance | <<locked>> | 88% | 53,751 psi | 86% | 2910 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,637 psi | 59% | 1775 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 53,650 psi | 86% | 2782 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,028 psi | 90% | 2818 fps | 99.5% |
| IMR 4350 | <<locked>> | 90% | 53,084 psi | 85% | 2812 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 53,606 psi | 86% | 2805 fps | 99.2% |
| IMR 4831 | <<locked>> | 92% | 55,767 psi | 89% | 2874 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,347 psi | 89% | 2851 fps | 97% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,042 psi | 88% | 2956 fps | 97.5% |
| Lovex S062 | <<locked>> | 82% | 54,099 psi | 87% | 2779 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 53,751 psi | 86% | 2802 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 55,085 psi | 88% | 2844 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,558 psi | 76% | 2743 fps | 99.1% |
| Norma 203B | <<locked>> | 82% | 54,549 psi | 87% | 2831 fps | 100% |
| Norma 204 | <<locked>> | 90% | 53,476 psi | 86% | 2861 fps | 98.1% |
| Norma MRP | <<locked>> | 98% | 56,362 psi | 90% | 3002 fps | 99.6% |
| Norma URP | <<locked>> | 90% | 53,983 psi | 87% | 2864 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,317 psi | 89% | 2858 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,361 psi | 89% | 2972 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 92% | 56,362 psi | 90% | 2923 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,617 psi | 80% | 2844 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,362 psi | 60% | 1818 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,217 psi | 90% | 2844 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 52,968 psi | 85% | 2894 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,274 psi | 89% | 2904 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 53,432 psi | 86% | 2930 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,498 psi | 73% | 2864 fps | 98.5% |
| Rottweil R 902 | <<locked>> | 82% | 55,811 psi | 89% | 2789 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,130 psi | 90% | 2838 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,143 psi | 87% | 2841 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 96% | 54,882 psi | 88% | 2904 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 88% | 55,288 psi | 89% | 2828 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 53,751 psi | 86% | 2802 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 54,099 psi | 87% | 2779 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,085 psi | 88% | 2844 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,157 psi | 87% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 53,461 psi | 86% | 2674 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 53,258 psi | 85% | 2756 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,418 psi | 87% | 2897 fps | 98.5% |
| Somchem S355 | <<locked>> | 86% | 55,956 psi | 90% | 2831 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,854 psi | 90% | 2835 fps | 96.8% |
| Somchem S365 | <<locked>> | 92% | 53,606 psi | 86% | 2871 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,448 psi | 89% | 2877 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 82% | 56,376 psi | 90% | 2746 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 53,780 psi | 86% | 2759 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,912 psi | 90% | 2858 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,708 psi | 88% | 2851 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 82% | 54,723 psi | 88% | 2759 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,114 psi | 88% | 2864 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,246 psi | 90% | 2930 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 52,866 psi | 85% | 2933 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,579 psi | 89% | 2825 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 53,853 psi | 86% | 2881 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,269 psi | 79% | 2972 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,535 psi | 89% | 2871 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% | 51,242 psi | 82% | 2730 fps | 98.4% |
| Accurate 3100 | <<locked>> | 84% | 33,156 psi | 53% | 2448 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 51,097 psi | 82% | 2723 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,276 psi | 63% | 2598 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 96% | 51,648 psi | 83% | 2913 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 48,022 psi | 77% | 2700 fps | 100% |
| ADI AR 2209 | <<locked>> | 88% | 43,279 psi | 69% | 2697 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 94% | 47,065 psi | 75% | 2799 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 40,640 psi | 65% | 2638 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,776 psi | 78% | 2726 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,851 psi | 83% | 2792 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,116 psi | 61% | 2608 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,395 psi | 70% | 2733 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 40,219 psi | 64% | 2631 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 90% | 40,654 psi | 65% | 2684 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,007 psi | 45% | 2365 fps | 97% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,807 psi | 51% | 2487 fps | 95.3% |
| Alliant Reloder-26 | 64.5 gr | 80% | 29,936 psi | 48% | 2474 fps | 95.3% |
| Bofors RP15 | <<locked>> | 94% | 42,801 psi | 69% | 2726 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 49,211 psi | 79% | 2740 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 40,654 psi | 65% | 2684 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 43,004 psi | 69% | 2612 fps | 97% |
| Hodgdon H1000 | <<locked>> | 98% | 43,221 psi | 69% | 2713 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 49,356 psi | 79% | 2749 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 41,176 psi | 66% | 2648 fps | 97.1% |
| Hodgdon H4350 | <<locked>> | 80% | 44,092 psi | 71% | 2667 fps | 96.5% |
| Hodgdon H4831 | <<locked>> | 94% | 50,459 psi | 81% | 2805 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 94% | 49,385 psi | 79% | 2789 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,723 psi | 57% | 2503 fps | 99.3% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,972 psi | 64% | 2740 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 40,176 psi | 64% | 2657 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 44% | 1585 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,531 psi | 81% | 2736 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,634 psi | 84% | 2766 fps | 99.1% |
| IMR 4350 | <<locked>> | 80% | 38,682 psi | 62% | 2539 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,425 psi | 71% | 2641 fps | 97.7% |
| IMR 4831 | <<locked>> | 80% | 37,637 psi | 60% | 2549 fps | 98.6% |
| IMR 4955 Enduron | <<locked>> | 92% | 49,081 psi | 79% | 2746 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 96% | 47,921 psi | 77% | 2828 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 50,807 psi | 81% | 2730 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,959 psi | 67% | 2592 fps | 98.4% |
| Lovex S070 | <<locked>> | 80% | 40,321 psi | 65% | 2579 fps | 97% |
| Lovex S071 | <<locked>> | 88% | 32,256 psi | 52% | 2425 fps | 95% |
| Norma 203B | <<locked>> | 80% | 51,213 psi | 82% | 2779 fps | 100% |
| Norma 204 | <<locked>> | 84% | 43,787 psi | 70% | 2684 fps | 95.9% |
| Norma MRP | 67.3 gr | 86% | 37,072 psi | 59% | 2631 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 38,986 psi | 63% | 2595 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 80% | 51,706 psi | 83% | 2802 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 44,831 psi | 72% | 2779 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 37,811 psi | 61% | 2582 fps | 97% |
| Ramshot Magnum | <<locked>> | 94% | 39,769 psi | 64% | 2654 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,862 psi | 45% | 1621 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,211 psi | 79% | 2733 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,093 psi | 74% | 2785 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,073 psi | 63% | 2618 fps | 98.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,681 psi | 60% | 2621 fps | 98% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,927 psi | 59% | 2661 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 52,634 psi | 84% | 2740 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,354 psi | 74% | 2684 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,831 psi | 72% | 2674 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 88% | 42,032 psi | 67% | 2671 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 43,004 psi | 69% | 2612 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,959 psi | 67% | 2592 fps | 98.4% |
| Shooters World Precision | <<locked>> | 80% | 50,807 psi | 81% | 2730 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,321 psi | 65% | 2579 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,485 psi | 76% | 2740 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,369 psi | 76% | 2585 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,147 psi | 66% | 2539 fps | 97.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 41,640 psi | 67% | 2664 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 46,456 psi | 74% | 2680 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,892 psi | 78% | 2720 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 35,476 psi | 57% | 2552 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 37,478 psi | 60% | 2543 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 53,069 psi | 85% | 2700 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,454 psi | 71% | 2612 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,321 psi | 65% | 2592 fps | 98.9% |
| Vihtavuori N165 | <<locked>> | 90% | 39,363 psi | 63% | 2575 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 51,213 psi | 82% | 2710 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,740 psi | 64% | 2592 fps | 98.7% |
| Vihtavuori N555 | <<locked>> | 80% | 31,154 psi | 50% | 2444 fps | 97.1% |
| Vihtavuori N560 | 73.6 gr | 94% | 49,313 psi | 79% | 2867 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,407 psi | 63% | 2562 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 41,365 psi | 66% | 2651 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,816 psi | 40% | 2339 fps | 95.8% |
| Winchester Supreme 780 | <<locked>> | 90% | 42,148 psi | 68% | 2641 fps | 95.6% |
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 | Sako Hammerhead. Norma MRP delivers the highest muzzle velocity at 3,002 fps; across all powders the maximum-charge window runs from 1,775 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 1:15.0 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, Vihtavuori N560, Alliant Reloder-26 rank at the top here: for .300 Win. Mag. with the .308 | 180gr | Sako Hammerhead 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.