Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 180gr | Hornady InterLock RN bullet and 83 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% | 55,767 psi | 89% | 2808 fps | 99.1% |
| Accurate 3100 | <<locked>> | 98% | 54,636 psi | 88% | 2858 fps | 99.8% |
| Accurate 4064 | <<locked>> | 82% | 55,550 psi | 89% | 2789 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 52,794 psi | 85% | 2848 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 53,011 psi | 85% | 2940 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 84% | 55,158 psi | 88% | 2822 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 53,621 psi | 86% | 2894 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 98% | 54,955 psi | 88% | 2946 fps | 97.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,855 psi | 61% | 2657 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,101 psi | 90% | 2844 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,420 psi | 90% | 2867 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 53,751 psi | 86% | 2907 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 54,752 psi | 88% | 2923 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 53,156 psi | 85% | 2881 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,331 psi | 87% | 2943 fps | 98.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,172 psi | 88% | 2927 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,659 psi | 76% | 2861 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,405 psi | 89% | 3012 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,272 psi | 85% | 2927 fps | 98.4% |
| Bofors RP3 | <<locked>> | 82% | 53,461 psi | 86% | 2808 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 54,331 psi | 87% | 2943 fps | 98.6% |
| Bofors RP7 | <<locked>> | 88% | 56,304 psi | 90% | 2851 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,268 psi | 76% | 2802 fps | 96.6% |
| Hodgdon H380 | <<locked>> | 82% | 53,737 psi | 86% | 2825 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 54,897 psi | 88% | 2900 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 86% | 54,331 psi | 87% | 2858 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 96% | 55,027 psi | 88% | 2887 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,056 psi | 87% | 2871 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,027 psi | 87% | 2831 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,601 psi | 75% | 2900 fps | 98% |
| Hodgdon Superformance | <<locked>> | 88% | 55,129 psi | 88% | 2940 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,695 psi | 59% | 1785 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,607 psi | 88% | 2802 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 53,983 psi | 87% | 2835 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,331 psi | 87% | 2825 fps | 99.3% |
| IMR 4831 | <<locked>> | 90% | 53,287 psi | 85% | 2841 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 53,055 psi | 85% | 2822 fps | 96.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,333 psi | 90% | 2982 fps | 97.9% |
| Lovex S062 | <<locked>> | 82% | 54,824 psi | 88% | 2795 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,752 psi | 88% | 2822 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 56,043 psi | 90% | 2867 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,704 psi | 78% | 2766 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 55,709 psi | 89% | 2854 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,665 psi | 88% | 2884 fps | 98.4% |
| Norma MRP | <<locked>> | 96% | 54,099 psi | 87% | 2969 fps | 99.5% |
| Norma URP | <<locked>> | 90% | 55,056 psi | 88% | 2887 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,405 psi | 90% | 2877 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 52,968 psi | 85% | 2936 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 90% | 53,838 psi | 86% | 2887 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,039 psi | 82% | 2874 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,420 psi | 60% | 1824 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 53,635 psi | 86% | 2812 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,172 psi | 87% | 2913 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 52,823 psi | 85% | 2874 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,853 psi | 88% | 2956 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,920 psi | 75% | 2900 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 84% | 53,809 psi | 86% | 2808 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,259 psi | 89% | 2864 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 96% | 56,057 psi | 90% | 2927 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 88% | 56,304 psi | 90% | 2851 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,752 psi | 88% | 2822 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 54,824 psi | 88% | 2795 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,043 psi | 90% | 2867 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,245 psi | 89% | 2864 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,375 psi | 87% | 2694 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,215 psi | 87% | 2776 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,593 psi | 89% | 2920 fps | 98.8% |
| Somchem S355 | <<locked>> | 84% | 53,664 psi | 86% | 2805 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 53,403 psi | 86% | 2802 fps | 96.5% |
| Somchem S365 | <<locked>> | 92% | 54,752 psi | 88% | 2890 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 53,113 psi | 85% | 2844 fps | 99% |
| Vihtavuori N150 | <<locked>> | 86% | 54,824 psi | 88% | 2779 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 53,447 psi | 86% | 2828 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,999 psi | 90% | 2877 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 82% | 55,579 psi | 89% | 2776 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,318 psi | 90% | 2887 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 53,954 psi | 87% | 2900 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,186 psi | 87% | 2959 fps | 97.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,763 psi | 80% | 2867 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 53,040 psi | 85% | 2792 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,071 psi | 88% | 2904 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,010 psi | 82% | 2995 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 52,939 psi | 85% | 2838 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% | 52,228 psi | 84% | 2753 fps | 98.7% |
| Accurate 3100 | <<locked>> | 82% | 31,836 psi | 51% | 2415 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 52,170 psi | 84% | 2743 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,205 psi | 64% | 2621 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 94% | 49,414 psi | 79% | 2877 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 48,718 psi | 78% | 2717 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 41,437 psi | 66% | 2664 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 92% | 45,034 psi | 72% | 2762 fps | 95% |
| ADI AR 2225 | <<locked>> | 98% | 35,592 psi | 57% | 2598 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,530 psi | 79% | 2743 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,808 psi | 85% | 2815 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,812 psi | 62% | 2631 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,295 psi | 71% | 2753 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 41,075 psi | 66% | 2654 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 90% | 41,495 psi | 67% | 2703 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,689 psi | 46% | 2392 fps | 97.4% |
| Alliant Reloder-25 | <<locked>> | 88% | 32,503 psi | 52% | 2513 fps | 95.8% |
| Alliant Reloder-26 | 65.8 gr | 80% | 30,719 psi | 49% | 2500 fps | 95.9% |
| Bofors RP15 | <<locked>> | 92% | 40,988 psi | 66% | 2694 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 50,154 psi | 80% | 2756 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 41,495 psi | 67% | 2703 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 43,859 psi | 70% | 2635 fps | 97.3% |
| Hodgdon H1000 | <<locked>> | 98% | 44,063 psi | 71% | 2736 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 50,430 psi | 81% | 2772 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 42,047 psi | 67% | 2667 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 80% | 44,904 psi | 72% | 2690 fps | 96.9% |
| Hodgdon H4831 | <<locked>> | 92% | 48,109 psi | 77% | 2769 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 47,253 psi | 76% | 2756 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,434 psi | 58% | 2523 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 96% | 41,075 psi | 66% | 2776 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 41,075 psi | 66% | 2684 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,383 psi | 44% | 1591 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,256 psi | 82% | 2749 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 39,436 psi | 63% | 2562 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,237 psi | 73% | 2664 fps | 98% |
| IMR 4831 | <<locked>> | 80% | 38,508 psi | 62% | 2575 fps | 98.8% |
| IMR 4955 Enduron | <<locked>> | 90% | 46,891 psi | 75% | 2710 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 94% | 45,876 psi | 74% | 2795 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 51,764 psi | 83% | 2749 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,772 psi | 69% | 2615 fps | 98.6% |
| Lovex S070 | <<locked>> | 80% | 41,104 psi | 66% | 2598 fps | 97.3% |
| Lovex S071 | <<locked>> | 88% | 33,156 psi | 53% | 2451 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 52,170 psi | 84% | 2799 fps | 100% |
| Norma 204 | <<locked>> | 82% | 41,713 psi | 67% | 2648 fps | 95.4% |
| Norma MRP | 67.1 gr | 84% | 35,534 psi | 57% | 2598 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 39,885 psi | 64% | 2615 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 80% | 52,779 psi | 85% | 2825 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 45,803 psi | 73% | 2805 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 38,580 psi | 62% | 2602 fps | 97.3% |
| Ramshot Magnum | <<locked>> | 92% | 38,029 psi | 61% | 2618 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,934 psi | 45% | 1631 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,256 psi | 81% | 2756 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,036 psi | 75% | 2805 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,074 psi | 64% | 2641 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,551 psi | 62% | 2648 fps | 98.4% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 37,826 psi | 61% | 2690 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 47,340 psi | 76% | 2707 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 45,745 psi | 73% | 2700 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 86% | 40,263 psi | 65% | 2638 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 43,859 psi | 70% | 2635 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,772 psi | 69% | 2615 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 51,764 psi | 83% | 2749 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,104 psi | 66% | 2598 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,341 psi | 78% | 2756 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,066 psi | 77% | 2602 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,916 psi | 67% | 2562 fps | 97.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 39,900 psi | 64% | 2631 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 47,369 psi | 76% | 2703 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 50,024 psi | 80% | 2746 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 36,405 psi | 58% | 2575 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 38,392 psi | 62% | 2566 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 45,339 psi | 73% | 2631 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,176 psi | 66% | 2612 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 88% | 37,681 psi | 60% | 2546 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 52,286 psi | 84% | 2730 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,727 psi | 65% | 2615 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 80% | 31,879 psi | 51% | 2467 fps | 97.5% |
| Vihtavuori N560 | 73.5 gr | 92% | 47,253 psi | 76% | 2835 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 98% | 46,398 psi | 74% | 2805 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,248 psi | 65% | 2582 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,192 psi | 68% | 2674 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,338 psi | 41% | 2365 fps | 96.4% |
| Winchester Supreme 780 | <<locked>> | 88% | 40,248 psi | 65% | 2605 fps | 95.1% |
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 83 powders for .300 Win. Mag. loaded with the .308 | 180gr | Hornady InterLock RN. Alliant Reloder-26 delivers the highest muzzle velocity at 3,012 fps; across all powders the maximum-charge window runs from 1,785 fps to 3,012 fps. ADI AR 2225 gives the best case fill at 100 %, and 83 of the 83 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 1:16.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, Alliant Reloder-25 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 | Hornady InterLock RN 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.