Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 180gr | Barnes X BT bullet and 81 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% | 55,434 psi | 89% | 2759 fps | 98.8% |
| Accurate 3100 | <<locked>> | 98% | 54,447 psi | 87% | 2822 fps | 99.6% |
| Accurate 4064 | <<locked>> | 82% | 56,347 psi | 90% | 2762 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,405 psi | 90% | 2867 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 55,550 psi | 89% | 2949 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 84% | 54,563 psi | 87% | 2776 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,217 psi | 90% | 2897 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 98% | 53,853 psi | 86% | 2890 fps | 96.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,854 psi | 90% | 2805 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,086 psi | 90% | 2828 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,115 psi | 90% | 2913 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 53,722 psi | 86% | 2881 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,535 psi | 89% | 2884 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 53,185 psi | 85% | 2894 fps | 98.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,722 psi | 86% | 2881 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,050 psi | 75% | 2815 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,954 psi | 87% | 2969 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,185 psi | 84% | 2874 fps | 97.8% |
| Bofors RP3 | <<locked>> | 82% | 53,679 psi | 86% | 2776 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 53,185 psi | 85% | 2894 fps | 98.1% |
| Bofors RP7 | <<locked>> | 88% | 55,999 psi | 90% | 2808 fps | 99% |
| Hodgdon H380 | <<locked>> | 82% | 53,592 psi | 86% | 2785 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 54,172 psi | 87% | 2854 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 86% | 53,795 psi | 86% | 2812 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 96% | 53,954 psi | 87% | 2835 fps | 96.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,405 psi | 90% | 2874 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 53,374 psi | 86% | 2789 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,224 psi | 74% | 2851 fps | 97.2% |
| Hodgdon Superformance | <<locked>> | 88% | 53,983 psi | 87% | 2887 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,927 psi | 59% | 1752 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,389 psi | 87% | 2762 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,420 psi | 90% | 2792 fps | 99.3% |
| IMR 4350 | <<locked>> | 90% | 53,316 psi | 85% | 2785 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 53,911 psi | 86% | 2779 fps | 99% |
| IMR 4831 | <<locked>> | 92% | 56,420 psi | 90% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,695 psi | 89% | 2825 fps | 96.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,013 psi | 88% | 2920 fps | 97.1% |
| Lovex S062 | <<locked>> | 82% | 55,042 psi | 88% | 2762 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,621 psi | 88% | 2785 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 55,927 psi | 90% | 2825 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,733 psi | 78% | 2730 fps | 99.1% |
| Norma 203B | <<locked>> | 82% | 55,477 psi | 89% | 2815 fps | 100% |
| Norma 204 | <<locked>> | 90% | 53,969 psi | 87% | 2838 fps | 97.8% |
| Norma MRP | <<locked>> | 98% | 56,420 psi | 90% | 2976 fps | 99.5% |
| Norma URP | <<locked>> | 90% | 54,534 psi | 87% | 2844 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,869 psi | 90% | 2838 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,608 psi | 89% | 2940 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 92% | 56,434 psi | 90% | 2897 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,937 psi | 80% | 2818 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,782 psi | 61% | 1795 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 53,243 psi | 85% | 2766 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 53,200 psi | 85% | 2874 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,651 psi | 89% | 2884 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 53,606 psi | 86% | 2904 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,238 psi | 74% | 2848 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 84% | 53,809 psi | 86% | 2772 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,578 psi | 88% | 2815 fps | 97% |
| Rottweil R 905 | <<locked>> | 96% | 55,129 psi | 88% | 2874 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 55,999 psi | 90% | 2808 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,621 psi | 88% | 2785 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 55,042 psi | 88% | 2762 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,927 psi | 90% | 2825 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,447 psi | 87% | 2822 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 53,969 psi | 87% | 2651 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,099 psi | 87% | 2736 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,636 psi | 88% | 2871 fps | 98.3% |
| Somchem S355 | <<locked>> | 84% | 53,650 psi | 86% | 2769 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,246 psi | 90% | 2808 fps | 96.5% |
| Somchem S365 | <<locked>> | 92% | 53,838 psi | 86% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,101 psi | 90% | 2854 fps | 99% |
| Vihtavuori N150 | <<locked>> | 86% | 54,694 psi | 88% | 2743 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 52,924 psi | 85% | 2785 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,071 psi | 88% | 2828 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 82% | 55,274 psi | 89% | 2740 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,738 psi | 89% | 2844 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 53,490 psi | 86% | 2861 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 52,968 psi | 85% | 2904 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,463 psi | 89% | 2799 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,172 psi | 87% | 2854 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,110 psi | 79% | 2953 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,767 psi | 89% | 2844 fps | 98.2% |
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% | 52,069 psi | 83% | 2707 fps | 98.3% |
| Accurate 3100 | <<locked>> | 82% | 33,069 psi | 53% | 2411 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 53,156 psi | 85% | 2717 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,959 psi | 66% | 2602 fps | 99% |
| Accurate MAGPRO | <<locked>> | 96% | 51,793 psi | 83% | 2887 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 48,704 psi | 78% | 2680 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 43,874 psi | 70% | 2677 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 94% | 47,471 psi | 76% | 2772 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,574 psi | 79% | 2707 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,649 psi | 84% | 2772 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,102 psi | 63% | 2602 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,019 psi | 71% | 2720 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 43,555 psi | 70% | 2671 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 41,524 psi | 67% | 2674 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,631 psi | 48% | 2382 fps | 97.5% |
| Alliant Reloder-25 | <<locked>> | 88% | 33,083 psi | 53% | 2490 fps | 95.5% |
| Alliant Reloder-26 | 61.2 gr | 80% | 31,546 psi | 51% | 2490 fps | 95.8% |
| Bofors RP15 | <<locked>> | 94% | 43,540 psi | 70% | 2713 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 50,546 psi | 81% | 2730 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 41,524 psi | 67% | 2674 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 44,222 psi | 71% | 2602 fps | 96.9% |
| Hodgdon H380 | <<locked>> | 80% | 50,517 psi | 81% | 2736 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 42,076 psi | 67% | 2635 fps | 97% |
| Hodgdon H4350 | <<locked>> | 80% | 44,831 psi | 72% | 2651 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 94% | 50,763 psi | 81% | 2779 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 94% | 49,647 psi | 80% | 2759 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,898 psi | 59% | 2500 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 96% | 40,944 psi | 66% | 2730 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 40,886 psi | 66% | 2644 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,746 psi | 44% | 1565 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,256 psi | 82% | 2713 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,200 psi | 85% | 2740 fps | 99% |
| IMR 4350 | <<locked>> | 80% | 39,610 psi | 64% | 2530 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,237 psi | 73% | 2625 fps | 97.6% |
| IMR 4831 | <<locked>> | 80% | 39,117 psi | 63% | 2552 fps | 98.7% |
| IMR 4955 Enduron | <<locked>> | 92% | 49,327 psi | 79% | 2720 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 96% | 48,428 psi | 78% | 2805 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 51,895 psi | 83% | 2713 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,294 psi | 69% | 2585 fps | 98.4% |
| Lovex S070 | <<locked>> | 80% | 41,597 psi | 67% | 2569 fps | 97% |
| Lovex S071 | <<locked>> | 88% | 34,214 psi | 55% | 2438 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 52,069 psi | 83% | 2762 fps | 100% |
| Norma 204 | <<locked>> | 84% | 44,353 psi | 71% | 2664 fps | 95.7% |
| Norma MRP | 63.9 gr | 86% | 38,276 psi | 61% | 2631 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 40,059 psi | 64% | 2589 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 80% | 52,417 psi | 84% | 2785 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 48,472 psi | 78% | 2815 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 38,798 psi | 62% | 2575 fps | 97% |
| Ramshot Magnum | <<locked>> | 94% | 40,799 psi | 65% | 2641 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,398 psi | 46% | 1604 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,067 psi | 80% | 2713 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,543 psi | 75% | 2766 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,350 psi | 65% | 2615 fps | 98.6% |
| ReloadSwiss RS 70 | 60.7 gr | 80% | 38,827 psi | 62% | 2618 fps | 98.1% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 38,014 psi | 61% | 2654 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 47,703 psi | 76% | 2677 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 48,370 psi | 78% | 2710 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 88% | 43,033 psi | 69% | 2661 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 44,222 psi | 71% | 2602 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,294 psi | 69% | 2585 fps | 98.4% |
| Shooters World Precision | <<locked>> | 80% | 51,895 psi | 83% | 2713 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,597 psi | 67% | 2569 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,182 psi | 77% | 2723 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,196 psi | 77% | 2569 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,453 psi | 68% | 2533 fps | 97.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 42,641 psi | 68% | 2654 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 47,703 psi | 76% | 2671 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 49,516 psi | 79% | 2697 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 36,709 psi | 59% | 2552 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 38,754 psi | 62% | 2539 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 45,469 psi | 73% | 2598 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,321 psi | 66% | 2582 fps | 98.9% |
| Vihtavuori N165 | <<locked>> | 90% | 40,379 psi | 65% | 2569 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 52,156 psi | 84% | 2694 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,075 psi | 66% | 2589 fps | 98.7% |
| Vihtavuori N555 | <<locked>> | 80% | 32,808 psi | 53% | 2457 fps | 97.5% |
| Vihtavuori N560 | <<locked>> | 94% | 49,676 psi | 80% | 2844 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,292 psi | 65% | 2549 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 42,279 psi | 68% | 2638 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,571 psi | 43% | 2372 fps | 96.7% |
| Winchester Supreme 780 | <<locked>> | 90% | 42,844 psi | 69% | 2625 fps | 95.4% |
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 81 powders for .300 Win. Mag. loaded with the .308 | 180gr | Barnes X BT. Norma MRP delivers the highest muzzle velocity at 2,976 fps; across all powders the maximum-charge window runs from 1,752 fps to 2,976 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 81 of the 81 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 1:11.5 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. Alliant Reloder-26, Norma MRP, ReloadSwiss RS 70 rank at the top here: for .300 Win. Mag. with the .308 | 180gr | Barnes X BT 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.