Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 180gr | Winchester FailSafe bullet and 87 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.
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 2495 | <<locked>> | 82% | 55,941 psi | 90% | 2736 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 53,417 psi | 86% | 2756 fps | 98.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,969 psi | 88% | 2851 fps | 99.7% |
| Accurate 4064 | <<locked>> | 84% | 56,318 psi | 90% | 2792 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 53,461 psi | 86% | 2848 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 56,333 psi | 90% | 2825 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,346 psi | 87% | 2890 fps | 98.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,680 psi | 89% | 2943 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,680 psi | 89% | 2946 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 53,795 psi | 86% | 2799 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 53,882 psi | 86% | 2818 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,418 psi | 87% | 2907 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,492 psi | 89% | 2927 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 53,795 psi | 86% | 2877 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,679 psi | 88% | 2940 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,851 psi | 83% | 2871 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,904 psi | 72% | 2795 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,477 psi | 89% | 3009 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,067 psi | 80% | 2858 fps | 97.5% |
| Bofors RP3 | <<locked>> | 84% | 54,447 psi | 87% | 2812 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,679 psi | 88% | 2940 fps | 98.5% |
| Bofors RP7 | <<locked>> | 88% | 53,940 psi | 86% | 2799 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 84% | 54,810 psi | 88% | 2828 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 55,767 psi | 89% | 2904 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 88% | 55,419 psi | 89% | 2861 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 98% | 55,883 psi | 90% | 2887 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,839 psi | 88% | 2871 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,563 psi | 87% | 2828 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,173 psi | 90% | 2864 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,947 psi | 70% | 2828 fps | 96.8% |
| Hodgdon Superformance | <<locked>> | 90% | 55,956 psi | 90% | 2940 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,535 psi | 59% | 1762 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,825 psi | 90% | 2805 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,839 psi | 88% | 2792 fps | 99.3% |
| IMR 4350 | <<locked>> | 92% | 54,752 psi | 88% | 2831 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,448 psi | 89% | 2825 fps | 99.3% |
| IMR 4831 | <<locked>> | 92% | 54,070 psi | 87% | 2841 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,259 psi | 89% | 2844 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 53,838 psi | 86% | 2818 fps | 96.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,272 psi | 85% | 2913 fps | 96.9% |
| Lovex S062 | <<locked>> | 84% | 55,999 psi | 90% | 2799 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,593 psi | 89% | 2822 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 53,490 psi | 86% | 2812 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,861 psi | 74% | 2707 fps | 98.8% |
| Norma 203B | <<locked>> | 82% | 53,200 psi | 85% | 2802 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,666 psi | 89% | 2884 fps | 98.2% |
| Norma MRP | <<locked>> | 98% | 54,346 psi | 87% | 2963 fps | 99.4% |
| Norma URP | <<locked>> | 92% | 55,912 psi | 90% | 2887 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 53,809 psi | 86% | 2828 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,635 psi | 86% | 2933 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 92% | 54,607 psi | 88% | 2890 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,834 psi | 77% | 2805 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,275 psi | 60% | 1804 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,650 psi | 88% | 2812 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,042 psi | 88% | 2917 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 53,374 psi | 86% | 2871 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,564 psi | 89% | 2956 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,005 psi | 71% | 2822 fps | 97.9% |
| Rottweil R 902 | <<locked>> | 82% | 54,665 psi | 88% | 2762 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,534 psi | 87% | 2808 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,086 psi | 90% | 2861 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 96% | 53,098 psi | 85% | 2867 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 53,940 psi | 86% | 2799 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,593 psi | 89% | 2822 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 55,999 psi | 90% | 2799 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 53,490 psi | 86% | 2812 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,217 psi | 90% | 2867 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,492 psi | 89% | 2694 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,347 psi | 89% | 2776 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,115 psi | 90% | 2913 fps | 98.6% |
| Somchem S355 | <<locked>> | 86% | 54,694 psi | 88% | 2805 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,244 psi | 87% | 2799 fps | 96.3% |
| Somchem S365 | <<locked>> | 94% | 55,245 psi | 89% | 2887 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 53,766 psi | 86% | 2844 fps | 98.8% |
| Vihtavuori N135 | <<locked>> | 82% | 55,027 psi | 88% | 2720 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,230 psi | 89% | 2736 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,898 psi | 90% | 2779 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,244 psi | 87% | 2825 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,910 psi | 85% | 2815 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 82% | 53,301 psi | 85% | 2733 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,577 psi | 86% | 2835 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,302 psi | 87% | 2897 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,636 psi | 88% | 2953 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 53,751 psi | 86% | 2795 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,767 psi | 89% | 2904 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,789 psi | 75% | 2933 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 53,722 psi | 86% | 2835 fps | 98% |
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 2495 | <<locked>> | 80% | 52,533 psi | 84% | 2690 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,082 psi | 80% | 2700 fps | 98.1% |
| Accurate 3100 | <<locked>> | 86% | 34,214 psi | 55% | 2467 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 49,777 psi | 80% | 2697 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,101 psi | 61% | 2569 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 80% | 46,731 psi | 75% | 2671 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 41,901 psi | 67% | 2657 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 96% | 48,776 psi | 78% | 2822 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,011 psi | 83% | 2887 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,369 psi | 76% | 2697 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,691 psi | 81% | 2766 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,927 psi | 59% | 2575 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,945 psi | 67% | 2700 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,669 psi | 67% | 2654 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,843 psi | 67% | 2700 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,209 psi | 44% | 2336 fps | 96.4% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,779 psi | 53% | 2510 fps | 95.6% |
| Alliant Reloder-26 | 64.3 gr | 82% | 31,038 psi | 50% | 2503 fps | 95.7% |
| Bofors RP15 | <<locked>> | 94% | 41,278 psi | 66% | 2687 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 47,819 psi | 77% | 2710 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 41,843 psi | 67% | 2700 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 42,032 psi | 67% | 2582 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 80% | 48,051 psi | 77% | 2720 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 39,972 psi | 64% | 2615 fps | 96.6% |
| Hodgdon H4350 | <<locked>> | 80% | 42,902 psi | 69% | 2635 fps | 96% |
| Hodgdon H4831 | <<locked>> | 94% | 48,921 psi | 78% | 2769 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,227 psi | 82% | 2812 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,461 psi | 55% | 2470 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,605 psi | 84% | 2812 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,350 psi | 66% | 2766 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 38,870 psi | 62% | 2621 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,340 psi | 44% | 1575 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,168 psi | 79% | 2703 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,416 psi | 82% | 2736 fps | 98.9% |
| IMR 4350 | <<locked>> | 80% | 37,550 psi | 60% | 2507 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,468 psi | 70% | 2615 fps | 97.3% |
| IMR 4831 | <<locked>> | 80% | 36,579 psi | 59% | 2523 fps | 98.2% |
| IMR 4895 | <<locked>> | 80% | 52,011 psi | 83% | 2795 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 50,734 psi | 81% | 2766 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 96% | 46,470 psi | 75% | 2789 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 49,603 psi | 80% | 2703 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,944 psi | 66% | 2566 fps | 98% |
| Lovex S070 | <<locked>> | 80% | 39,146 psi | 63% | 2543 fps | 96.5% |
| Lovex S071 | <<locked>> | 90% | 33,286 psi | 53% | 2448 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 50,053 psi | 80% | 2753 fps | 100% |
| Norma 204 | <<locked>> | 84% | 42,482 psi | 68% | 2651 fps | 95.3% |
| Norma MRP | 67 gr | 88% | 38,479 psi | 62% | 2657 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 37,768 psi | 61% | 2562 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 80% | 50,386 psi | 81% | 2776 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 46,528 psi | 75% | 2802 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 36,666 psi | 59% | 2549 fps | 96.4% |
| Ramshot Magnum | <<locked>> | 94% | 38,537 psi | 62% | 2618 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,717 psi | 44% | 1608 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,066 psi | 77% | 2703 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,541 psi | 71% | 2753 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,681 psi | 60% | 2585 fps | 98.1% |
| ReloadSwiss RS 70 | 62.2 gr | 80% | 36,695 psi | 59% | 2592 fps | 97.6% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,261 psi | 61% | 2684 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 51,401 psi | 82% | 2713 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,947 psi | 72% | 2654 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,354 psi | 74% | 2694 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 88% | 40,698 psi | 65% | 2638 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 42,032 psi | 67% | 2582 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,944 psi | 66% | 2566 fps | 98% |
| Shooters World Precision | <<locked>> | 80% | 49,603 psi | 80% | 2703 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,146 psi | 63% | 2543 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,209 psi | 74% | 2710 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,224 psi | 74% | 2562 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,118 psi | 64% | 2510 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,379 psi | 65% | 2631 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 45,310 psi | 73% | 2654 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 50,865 psi | 82% | 2746 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 34,171 psi | 55% | 2520 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 38,740 psi | 62% | 2566 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 51,692 psi | 83% | 2677 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,692 psi | 83% | 2687 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,192 psi | 69% | 2585 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,276 psi | 63% | 2562 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 92% | 40,683 psi | 65% | 2598 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 49,966 psi | 80% | 2684 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,609 psi | 62% | 2562 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 29,950 psi | 48% | 2408 fps | 96.5% |
| Vihtavuori N560 | <<locked>> | 94% | 47,558 psi | 76% | 2828 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,276 psi | 61% | 2533 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 39,972 psi | 64% | 2615 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,643 psi | 41% | 2365 fps | 96.2% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,555 psi | 70% | 2661 fps | 95.8% |
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 94 powders for .300 Win. Mag. loaded with the .308 | 180gr | Winchester FailSafe. Alliant Reloder-26 delivers the highest muzzle velocity at 3,009 fps; across all powders the maximum-charge window runs from 1,762 fps to 3,009 fps. Accurate 3100 gives the best case fill at 100 %, and 94 of the 94 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 57–90 %, 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 2213, ADI AR 2217 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 | Winchester FailSafe they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, ADI AR 2225, Baschieri & Pellagri 109 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.