Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 180gr | Barnes X S bullet and 82 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>> | 84% | 53,621 psi | 86% | 2726 fps | 98.5% |
| Accurate 3100 | <<locked>> | 98% | 54,781 psi | 88% | 2828 fps | 99.7% |
| Accurate 4350 | <<locked>> | 88% | 53,185 psi | 85% | 2818 fps | 100% |
| ADI AR 2208 | <<locked>> | 84% | 54,955 psi | 88% | 2785 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 53,229 psi | 85% | 2851 fps | 97.9% |
| ADI AR 2213 | <<locked>> | 98% | 54,331 psi | 87% | 2900 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,173 psi | 90% | 2812 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,231 psi | 90% | 2831 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 53,098 psi | 85% | 2867 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 54,070 psi | 87% | 2887 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,072 psi | 90% | 2894 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 53,708 psi | 86% | 2904 fps | 98.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,288 psi | 87% | 2887 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,529 psi | 76% | 2825 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,259 psi | 87% | 2972 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,736 psi | 85% | 2887 fps | 97.9% |
| Bofors RP3 | <<locked>> | 82% | 54,114 psi | 87% | 2782 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 53,708 psi | 86% | 2904 fps | 98.2% |
| Bofors RP7 | <<locked>> | 88% | 56,333 psi | 90% | 2815 fps | 99% |
| Hodgdon H380 | <<locked>> | 82% | 53,940 psi | 86% | 2792 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 86% | 55,695 psi | 89% | 2881 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 90% | 55,941 psi | 90% | 2848 fps | 98.6% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 53,563 psi | 86% | 2828 fps | 96% |
| Hodgdon H4831 SC | <<locked>> | 96% | 53,301 psi | 85% | 2825 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 53,795 psi | 86% | 2799 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,085 psi | 88% | 2828 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,398 psi | 74% | 2858 fps | 97.3% |
| Hodgdon Superformance | <<locked>> | 88% | 54,244 psi | 87% | 2894 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,840 psi | 59% | 1752 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,491 psi | 87% | 2772 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,056 psi | 87% | 2759 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,028 psi | 90% | 2785 fps | 99.3% |
| IMR 4350 | <<locked>> | 90% | 53,606 psi | 86% | 2792 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,244 psi | 87% | 2785 fps | 99.1% |
| IMR 4831 | <<locked>> | 94% | 54,389 psi | 87% | 2825 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,941 psi | 90% | 2831 fps | 96.7% |
| IMR 7828 SSC | <<locked>> | 98% | 55,724 psi | 89% | 2936 fps | 97.3% |
| Lovex S062 | <<locked>> | 82% | 55,201 psi | 89% | 2766 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,955 psi | 88% | 2792 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 56,231 psi | 90% | 2831 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,066 psi | 79% | 2740 fps | 99.1% |
| Norma 203B | <<locked>> | 82% | 55,622 psi | 89% | 2818 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,230 psi | 87% | 2844 fps | 97.9% |
| Norma MRP | <<locked>> | 96% | 53,287 psi | 85% | 2927 fps | 99.2% |
| Norma URP | <<locked>> | 90% | 54,868 psi | 88% | 2851 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,217 psi | 90% | 2844 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,564 psi | 89% | 2943 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 90% | 53,505 psi | 86% | 2851 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,318 psi | 90% | 2923 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,695 psi | 60% | 1798 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 53,577 psi | 86% | 2772 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 53,577 psi | 86% | 2881 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,217 psi | 90% | 2894 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,099 psi | 87% | 2913 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,543 psi | 75% | 2854 fps | 98.4% |
| Rottweil R 903 | <<locked>> | 84% | 54,186 psi | 87% | 2779 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,824 psi | 88% | 2822 fps | 97.1% |
| Rottweil R 905 | <<locked>> | 96% | 55,651 psi | 89% | 2887 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 56,333 psi | 90% | 2815 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,955 psi | 88% | 2792 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 55,201 psi | 89% | 2766 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,231 psi | 90% | 2831 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,810 psi | 88% | 2828 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,360 psi | 87% | 2661 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,375 psi | 87% | 2740 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,172 psi | 88% | 2881 fps | 98.4% |
| Somchem S355 | <<locked>> | 84% | 54,056 psi | 87% | 2772 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 53,127 psi | 85% | 2759 fps | 95.9% |
| Somchem S365 | <<locked>> | 92% | 54,418 psi | 87% | 2858 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,347 psi | 90% | 2861 fps | 99.1% |
| Unknown powder | <<locked>> | 88% | 55,100 psi | 88% | 2851 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 54,781 psi | 88% | 2746 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 53,258 psi | 85% | 2792 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,274 psi | 89% | 2831 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 82% | 55,593 psi | 89% | 2743 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,101 psi | 90% | 2851 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 53,882 psi | 86% | 2867 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 53,447 psi | 86% | 2913 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,014 psi | 90% | 2808 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,695 psi | 89% | 2881 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,588 psi | 80% | 2959 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,056 psi | 87% | 2822 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 2700 | <<locked>> | 80% | 47,427 psi | 76% | 2621 fps | 97.5% |
| Accurate 3100 | <<locked>> | 82% | 33,214 psi | 53% | 2415 fps | 95.2% |
| Accurate 4350 | <<locked>> | 80% | 41,278 psi | 66% | 2608 fps | 99% |
| ADI AR 2208 | <<locked>> | 80% | 48,805 psi | 78% | 2687 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 44,150 psi | 71% | 2684 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 94% | 47,906 psi | 77% | 2782 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,951 psi | 80% | 2717 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,997 psi | 85% | 2782 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,233 psi | 63% | 2605 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,353 psi | 71% | 2726 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 41,336 psi | 66% | 2625 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 90% | 41,858 psi | 67% | 2680 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,863 psi | 48% | 2392 fps | 97.6% |
| Alliant Reloder-25 | <<locked>> | 88% | 33,301 psi | 53% | 2497 fps | 95.7% |
| Alliant Reloder-26 | 61.6 gr | 80% | 31,807 psi | 51% | 2500 fps | 96% |
| Bofors RP15 | <<locked>> | 92% | 41,292 psi | 66% | 2667 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 50,763 psi | 81% | 2733 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 41,858 psi | 67% | 2680 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 44,570 psi | 71% | 2608 fps | 97% |
| Hodgdon H380 | <<locked>> | 80% | 50,865 psi | 82% | 2743 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 45,818 psi | 73% | 2710 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 80% | 41,698 psi | 67% | 2585 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 98% | 50,372 psi | 81% | 2776 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 94% | 50,111 psi | 80% | 2772 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,999 psi | 59% | 2503 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,924 psi | 83% | 2779 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 41,147 psi | 66% | 2736 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 41,220 psi | 66% | 2654 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,717 psi | 44% | 1568 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,329 psi | 82% | 2723 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,167 psi | 77% | 2664 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,239 psi | 76% | 2638 fps | 98.1% |
| IMR 4350 | <<locked>> | 80% | 39,885 psi | 64% | 2536 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,368 psi | 73% | 2628 fps | 97.7% |
| IMR 4831 | <<locked>> | 80% | 36,013 psi | 58% | 2484 fps | 98% |
| IMR 4955 Enduron | <<locked>> | 92% | 49,792 psi | 80% | 2730 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 94% | 49,110 psi | 79% | 2818 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 52,228 psi | 84% | 2720 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,584 psi | 70% | 2592 fps | 98.5% |
| Lovex S070 | <<locked>> | 80% | 41,945 psi | 67% | 2575 fps | 97.2% |
| Lovex S071 | <<locked>> | 86% | 32,648 psi | 52% | 2402 fps | 95% |
| Norma 203B | <<locked>> | 80% | 52,431 psi | 84% | 2769 fps | 100% |
| Norma 204 | <<locked>> | 82% | 42,032 psi | 67% | 2618 fps | 95% |
| Norma MRP | 64.3 gr | 86% | 38,566 psi | 62% | 2638 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 40,437 psi | 65% | 2595 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 80% | 52,779 psi | 85% | 2792 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 48,312 psi | 77% | 2815 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 39,102 psi | 63% | 2582 fps | 97.1% |
| Ramshot Magnum | <<locked>> | 90% | 39,581 psi | 63% | 2618 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,369 psi | 45% | 1608 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,343 psi | 81% | 2720 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,891 psi | 75% | 2776 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,640 psi | 65% | 2625 fps | 98.7% |
| ReloadSwiss RS 70 | 61.1 gr | 80% | 39,117 psi | 63% | 2625 fps | 98.2% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 38,392 psi | 62% | 2664 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 48,066 psi | 77% | 2684 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 45,876 psi | 74% | 2664 fps | 95% |
| Rottweil R 905 | <<locked>> | 86% | 40,567 psi | 65% | 2612 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 44,570 psi | 71% | 2608 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,584 psi | 70% | 2592 fps | 98.5% |
| Shooters World Precision | <<locked>> | 80% | 52,228 psi | 84% | 2720 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,945 psi | 67% | 2575 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,501 psi | 78% | 2730 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,327 psi | 77% | 2572 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,583 psi | 68% | 2533 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 42,946 psi | 69% | 2664 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 48,037 psi | 77% | 2677 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 49,937 psi | 80% | 2707 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 37,043 psi | 59% | 2559 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 39,059 psi | 63% | 2546 fps | 95.4% |
| Unknown powder | <<locked>> | 80% | 43,105 psi | 69% | 2641 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 80% | 45,847 psi | 74% | 2605 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,669 psi | 67% | 2589 fps | 99% |
| Vihtavuori N165 | <<locked>> | 90% | 40,712 psi | 65% | 2575 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 52,489 psi | 84% | 2700 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,350 psi | 66% | 2595 fps | 98.8% |
| Vihtavuori N555 | <<locked>> | 80% | 33,141 psi | 53% | 2467 fps | 97.7% |
| Vihtavuori N560 | <<locked>> | 94% | 50,111 psi | 80% | 2854 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,567 psi | 65% | 2556 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 45,818 psi | 73% | 2710 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,760 psi | 43% | 2379 fps | 96.9% |
| Winchester Supreme 780 | <<locked>> | 86% | 41,452 psi | 66% | 2598 fps | 95% |
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 82 powders for .300 Win. Mag. loaded with the .308 | 180gr | Barnes X S. Alliant Reloder-26 delivers the highest muzzle velocity at 2,972 fps; across all powders the maximum-charge window runs from 1,752 fps to 2,972 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 82 of the 82 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 1:12.0 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. Alliant Reloder-26, Norma MRP, ReloadSwiss RS 70 rank at the top here: for .300 Win. Mag. with the .308 | 180gr | Barnes X S 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.