Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 180gr | Speer Boat-Tail 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% | 53,940 psi | 86% | 2766 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,912 psi | 90% | 2871 fps | 99.8% |
| Accurate 4064 | <<locked>> | 82% | 53,621 psi | 86% | 2756 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,230 psi | 87% | 2864 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 54,259 psi | 87% | 2953 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 84% | 53,577 psi | 86% | 2789 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,274 psi | 89% | 2910 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 98% | 52,808 psi | 85% | 2900 fps | 96.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,360 psi | 87% | 2812 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,462 psi | 87% | 2831 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,969 psi | 88% | 2917 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,333 psi | 90% | 2943 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,433 psi | 87% | 2894 fps | 98.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,564 psi | 89% | 2956 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,533 psi | 84% | 2884 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,614 psi | 73% | 2815 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 52,576 psi | 84% | 2969 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,908 psi | 82% | 2877 fps | 97.8% |
| Bofors RP3 | <<locked>> | 84% | 55,245 psi | 89% | 2828 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,564 psi | 89% | 2956 fps | 98.7% |
| Bofors RP7 | <<locked>> | 88% | 54,389 psi | 87% | 2812 fps | 99% |
| Hodgdon H380 | <<locked>> | 84% | 55,376 psi | 89% | 2844 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 56,275 psi | 90% | 2913 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 88% | 55,912 psi | 90% | 2874 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 96% | 52,997 psi | 85% | 2848 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,448 psi | 89% | 2884 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,347 psi | 89% | 2841 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,686 psi | 72% | 2848 fps | 97.1% |
| Hodgdon Superformance | <<locked>> | 88% | 52,721 psi | 85% | 2894 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,608 psi | 59% | 1768 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,405 psi | 90% | 2822 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,347 psi | 89% | 2802 fps | 99.4% |
| IMR 4350 | <<locked>> | 92% | 55,448 psi | 89% | 2848 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,173 psi | 90% | 2841 fps | 99.4% |
| IMR 4831 | <<locked>> | 92% | 54,578 psi | 88% | 2854 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,854 psi | 90% | 2858 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,708 psi | 88% | 2838 fps | 96.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,867 psi | 86% | 2930 fps | 97.2% |
| Lovex S062 | <<locked>> | 82% | 53,301 psi | 85% | 2766 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,318 psi | 90% | 2838 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 54,186 psi | 87% | 2828 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,528 psi | 75% | 2723 fps | 98.9% |
| Norma 203B | <<locked>> | 82% | 53,766 psi | 86% | 2818 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,333 psi | 90% | 2900 fps | 98.4% |
| Norma MRP | <<locked>> | 98% | 55,274 psi | 89% | 2982 fps | 99.5% |
| Norma URP | <<locked>> | 92% | 56,391 psi | 90% | 2900 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,607 psi | 88% | 2844 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,433 psi | 87% | 2949 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 92% | 55,288 psi | 89% | 2904 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,588 psi | 78% | 2822 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,144 psi | 60% | 1808 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,332 psi | 89% | 2828 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,854 psi | 90% | 2933 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,114 psi | 87% | 2887 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,275 psi | 90% | 2969 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,628 psi | 72% | 2841 fps | 98.2% |
| Rottweil R 902 | <<locked>> | 82% | 55,042 psi | 88% | 2772 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,361 psi | 89% | 2825 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 53,374 psi | 86% | 2825 fps | 97% |
| Rottweil R 905 | <<locked>> | 96% | 53,795 psi | 86% | 2881 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 54,389 psi | 87% | 2812 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,318 psi | 90% | 2838 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 53,301 psi | 85% | 2766 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,186 psi | 87% | 2828 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 53,229 psi | 85% | 2831 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,072 psi | 90% | 2707 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,014 psi | 90% | 2792 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 53,330 psi | 86% | 2877 fps | 98.3% |
| Somchem S355 | <<locked>> | 86% | 55,230 psi | 89% | 2818 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,969 psi | 88% | 2815 fps | 96.6% |
| Somchem S365 | <<locked>> | 94% | 56,072 psi | 90% | 2904 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,462 psi | 87% | 2858 fps | 99% |
| Vihtavuori N135 | <<locked>> | 82% | 55,492 psi | 89% | 2733 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,579 psi | 89% | 2746 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,405 psi | 90% | 2792 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,998 psi | 88% | 2844 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,780 psi | 86% | 2835 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 82% | 53,809 psi | 86% | 2743 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,259 psi | 87% | 2851 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,085 psi | 88% | 2910 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,535 psi | 89% | 2972 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,607 psi | 88% | 2808 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 52,953 psi | 85% | 2861 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,761 psi | 77% | 2949 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,607 psi | 88% | 2854 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% | 50,560 psi | 81% | 2713 fps | 98.3% |
| Accurate 3100 | <<locked>> | 84% | 32,518 psi | 52% | 2431 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 50,241 psi | 81% | 2707 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,493 psi | 62% | 2582 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 96% | 50,488 psi | 81% | 2887 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 47,297 psi | 76% | 2687 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 42,511 psi | 68% | 2677 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 94% | 46,166 psi | 74% | 2776 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,964 psi | 77% | 2710 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,053 psi | 82% | 2779 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,434 psi | 60% | 2592 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,467 psi | 68% | 2717 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,105 psi | 68% | 2667 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 92% | 42,467 psi | 68% | 2720 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,470 psi | 44% | 2349 fps | 96.6% |
| Alliant Reloder-25 | <<locked>> | 90% | 33,112 psi | 53% | 2523 fps | 95.9% |
| Alliant Reloder-26 | 65 gr | 82% | 31,444 psi | 50% | 2520 fps | 96% |
| Bofors RP15 | <<locked>> | 94% | 41,887 psi | 67% | 2707 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 48,399 psi | 78% | 2723 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 42,467 psi | 68% | 2720 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 42,351 psi | 68% | 2595 fps | 96.7% |
| Hodgdon H380 | <<locked>> | 80% | 48,602 psi | 78% | 2733 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 40,495 psi | 65% | 2628 fps | 96.8% |
| Hodgdon H4350 | <<locked>> | 80% | 43,366 psi | 70% | 2648 fps | 96.2% |
| Hodgdon H4831 | <<locked>> | 94% | 49,574 psi | 79% | 2785 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 48,443 psi | 78% | 2766 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,012 psi | 56% | 2487 fps | 99.2% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,858 psi | 67% | 2782 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 39,262 psi | 63% | 2635 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 44% | 1578 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,763 psi | 80% | 2720 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,924 psi | 83% | 2749 fps | 99% |
| IMR 4350 | <<locked>> | 80% | 38,043 psi | 61% | 2523 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,758 psi | 70% | 2625 fps | 97.5% |
| IMR 4831 | <<locked>> | 80% | 36,941 psi | 59% | 2533 fps | 98.3% |
| IMR 4895 | <<locked>> | 80% | 52,388 psi | 84% | 2805 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,138 psi | 77% | 2726 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 96% | 47,021 psi | 75% | 2808 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 49,966 psi | 80% | 2713 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,278 psi | 66% | 2575 fps | 98.2% |
| Lovex S070 | <<locked>> | 80% | 39,639 psi | 64% | 2559 fps | 96.7% |
| Lovex S071 | <<locked>> | 90% | 33,750 psi | 54% | 2461 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 50,415 psi | 81% | 2766 fps | 100% |
| Norma 204 | <<locked>> | 84% | 42,960 psi | 69% | 2667 fps | 95.5% |
| Norma MRP | 66.2 gr | 86% | 36,376 psi | 58% | 2612 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 38,305 psi | 61% | 2579 fps | 98.5% |
| Ramshot Big Game | <<locked>> | 80% | 50,966 psi | 82% | 2789 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 47,108 psi | 76% | 2822 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 37,144 psi | 60% | 2562 fps | 96.7% |
| Ramshot Magnum | <<locked>> | 94% | 39,001 psi | 63% | 2631 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,876 psi | 45% | 1617 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,559 psi | 78% | 2717 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,136 psi | 72% | 2766 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,348 psi | 61% | 2602 fps | 98.4% |
| ReloadSwiss RS 70 | 62.9 gr | 80% | 37,086 psi | 59% | 2605 fps | 97.8% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,740 psi | 62% | 2703 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 51,808 psi | 83% | 2726 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,542 psi | 73% | 2671 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 47,007 psi | 75% | 2713 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 88% | 41,220 psi | 66% | 2651 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 42,351 psi | 68% | 2595 fps | 96.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,278 psi | 66% | 2575 fps | 98.2% |
| Shooters World Precision | <<locked>> | 80% | 49,966 psi | 80% | 2713 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,639 psi | 64% | 2559 fps | 96.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,760 psi | 75% | 2723 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,601 psi | 75% | 2572 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,538 psi | 65% | 2523 fps | 96.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,828 psi | 65% | 2644 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 45,658 psi | 73% | 2667 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 51,401 psi | 82% | 2759 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 34,737 psi | 56% | 2533 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 39,204 psi | 63% | 2579 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 80% | 52,112 psi | 84% | 2687 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,315 psi | 84% | 2700 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,714 psi | 70% | 2598 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,595 psi | 63% | 2575 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 90% | 38,609 psi | 62% | 2559 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 50,502 psi | 81% | 2697 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,102 psi | 63% | 2575 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 80% | 30,472 psi | 49% | 2428 fps | 96.8% |
| Vihtavuori N560 | <<locked>> | 94% | 48,385 psi | 78% | 2848 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,667 psi | 62% | 2546 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 40,495 psi | 65% | 2628 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,366 psi | 39% | 2320 fps | 95.2% |
| Winchester Supreme 780 | <<locked>> | 90% | 41,263 psi | 66% | 2618 fps | 95.2% |
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 92 powders for .300 Win. Mag. loaded with the .308 | 180gr | Speer Boat-Tail. Norma MRP delivers the highest muzzle velocity at 2,982 fps; across all powders the maximum-charge window runs from 1,768 fps to 2,982 fps. Accurate 3100 gives the best case fill at 100 %, and 92 of the 92 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2217, ADI AR 2225 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 | Speer Boat-Tail they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, Baschieri & Pellagri 109, Bofors RP30 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.