Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 185gr | Berger Classic Hybrid Hunter 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 Vihtavuori N560.
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% | 54,375 psi | 87% | 2736 fps | 99% |
| Accurate 3100 | <<locked>> | 98% | 52,808 psi | 85% | 2789 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 54,041 psi | 87% | 2723 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,955 psi | 88% | 2835 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 54,839 psi | 88% | 2927 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 84% | 53,969 psi | 87% | 2756 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,811 psi | 89% | 2881 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 98% | 53,388 psi | 86% | 2874 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,882 psi | 88% | 2779 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,897 psi | 88% | 2795 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,666 psi | 89% | 2887 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 53,069 psi | 85% | 2854 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,984 psi | 88% | 2864 fps | 98.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,304 psi | 90% | 2927 fps | 98.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,214 psi | 85% | 2854 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,209 psi | 74% | 2792 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,185 psi | 85% | 2940 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,576 psi | 83% | 2851 fps | 98.1% |
| Bofors RP3 | <<locked>> | 84% | 55,811 psi | 89% | 2795 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,304 psi | 90% | 2927 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 54,926 psi | 88% | 2782 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,818 psi | 73% | 2726 fps | 96.1% |
| Hodgdon H380 | <<locked>> | 84% | 55,941 psi | 90% | 2812 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 53,374 psi | 86% | 2831 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 86% | 52,982 psi | 85% | 2789 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 96% | 53,577 psi | 86% | 2818 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,086 psi | 90% | 2858 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,796 psi | 89% | 2808 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,237 psi | 73% | 2825 fps | 97.6% |
| Hodgdon Superformance | <<locked>> | 88% | 53,359 psi | 86% | 2864 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,622 psi | 59% | 1739 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 53,476 psi | 86% | 2736 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,753 psi | 89% | 2772 fps | 99.5% |
| IMR 4350 | <<locked>> | 92% | 56,130 psi | 90% | 2818 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,420 psi | 90% | 2805 fps | 99.5% |
| IMR 4831 | <<locked>> | 92% | 55,332 psi | 89% | 2825 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,362 psi | 90% | 2822 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,187 psi | 88% | 2808 fps | 97.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,505 psi | 87% | 2904 fps | 97.5% |
| Lovex S062 | <<locked>> | 82% | 53,679 psi | 86% | 2730 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 53,374 psi | 86% | 2756 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 54,563 psi | 87% | 2795 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,021 psi | 75% | 2694 fps | 99.1% |
| Norma 203B | <<locked>> | 82% | 54,230 psi | 87% | 2782 fps | 100% |
| Norma 204 | <<locked>> | 90% | 53,171 psi | 85% | 2812 fps | 98.1% |
| Norma MRP | <<locked>> | 98% | 55,825 psi | 90% | 2953 fps | 99.6% |
| Norma URP | <<locked>> | 90% | 53,432 psi | 86% | 2815 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,926 psi | 88% | 2808 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,969 psi | 88% | 2923 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 55,825 psi | 90% | 2871 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,066 psi | 79% | 2795 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,376 psi | 60% | 1781 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,666 psi | 89% | 2795 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,362 psi | 90% | 2900 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,723 psi | 88% | 2854 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 52,939 psi | 85% | 2881 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,107 psi | 72% | 2818 fps | 98.5% |
| Rottweil R 902 | <<locked>> | 82% | 55,637 psi | 89% | 2740 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,912 psi | 90% | 2792 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 53,809 psi | 86% | 2795 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 96% | 54,346 psi | 87% | 2851 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 88% | 54,926 psi | 88% | 2782 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 53,374 psi | 86% | 2756 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 53,679 psi | 86% | 2730 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,563 psi | 87% | 2795 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 53,780 psi | 86% | 2799 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 53,301 psi | 85% | 2631 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,362 psi | 90% | 2759 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 53,882 psi | 86% | 2848 fps | 98.5% |
| Somchem S355 | <<locked>> | 86% | 55,738 psi | 89% | 2785 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,593 psi | 89% | 2792 fps | 96.9% |
| Somchem S365 | <<locked>> | 92% | 53,127 psi | 85% | 2822 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,042 psi | 88% | 2828 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 82% | 56,101 psi | 90% | 2700 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,217 psi | 90% | 2717 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 53,577 psi | 86% | 2713 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,651 psi | 89% | 2812 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,389 psi | 87% | 2805 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 54,259 psi | 87% | 2710 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,708 psi | 88% | 2818 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,709 psi | 89% | 2881 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,014 psi | 90% | 2943 fps | 97.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,834 psi | 77% | 2792 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,172 psi | 88% | 2779 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 53,374 psi | 86% | 2831 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,472 psi | 78% | 2920 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,969 psi | 88% | 2822 fps | 98.5% |
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% | 50,995 psi | 82% | 2684 fps | 98.5% |
| Accurate 3100 | <<locked>> | 84% | 32,924 psi | 53% | 2408 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 50,850 psi | 82% | 2677 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,088 psi | 63% | 2559 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 96% | 51,198 psi | 82% | 2864 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 47,805 psi | 77% | 2654 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 40,205 psi | 64% | 2592 fps | 95% |
| ADI AR 2213 | <<locked>> | 94% | 46,630 psi | 75% | 2749 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,356 psi | 78% | 2677 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,663 psi | 83% | 2746 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,768 psi | 61% | 2566 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,975 psi | 69% | 2687 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 39,885 psi | 64% | 2589 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 90% | 40,277 psi | 65% | 2641 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,847 psi | 45% | 2329 fps | 97.1% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,575 psi | 51% | 2448 fps | 95.4% |
| Alliant Reloder-26 | 62.7 gr | 80% | 29,689 psi | 48% | 2434 fps | 95.4% |
| Bofors RP15 | <<locked>> | 92% | 39,740 psi | 64% | 2625 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 48,820 psi | 78% | 2690 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 40,277 psi | 65% | 2641 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 42,859 psi | 69% | 2569 fps | 97.1% |
| Hodgdon H1000 | <<locked>> | 98% | 42,757 psi | 69% | 2664 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 49,037 psi | 79% | 2703 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 40,901 psi | 66% | 2605 fps | 97.2% |
| Hodgdon H4350 | <<locked>> | 80% | 43,758 psi | 70% | 2621 fps | 96.6% |
| Hodgdon H4831 | <<locked>> | 94% | 50,067 psi | 80% | 2759 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 48,907 psi | 78% | 2740 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,476 psi | 57% | 2461 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,639 psi | 64% | 2697 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 39,784 psi | 64% | 2615 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,412 psi | 44% | 1555 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,270 psi | 81% | 2687 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,286 psi | 84% | 2717 fps | 99.2% |
| IMR 4350 | <<locked>> | 80% | 38,363 psi | 62% | 2497 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,251 psi | 71% | 2598 fps | 97.8% |
| IMR 4831 | <<locked>> | 80% | 37,463 psi | 60% | 2510 fps | 98.6% |
| IMR 4895 | <<locked>> | 80% | 53,011 psi | 85% | 2776 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,689 psi | 78% | 2700 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 94% | 44,614 psi | 72% | 2723 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 50,517 psi | 81% | 2684 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,785 psi | 67% | 2549 fps | 98.5% |
| Lovex S070 | <<locked>> | 80% | 39,943 psi | 64% | 2530 fps | 97.1% |
| Lovex S071 | <<locked>> | 88% | 32,039 psi | 51% | 2385 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 51,024 psi | 82% | 2733 fps | 100% |
| Norma 204 | <<locked>> | 82% | 40,611 psi | 65% | 2582 fps | 95.1% |
| Norma MRP | 65.5 gr | 86% | 36,854 psi | 59% | 2592 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 38,638 psi | 62% | 2549 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 80% | 51,503 psi | 83% | 2759 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 44,440 psi | 71% | 2733 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 37,565 psi | 60% | 2539 fps | 97% |
| Ramshot Magnum | <<locked>> | 94% | 39,523 psi | 63% | 2612 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,804 psi | 45% | 1588 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,979 psi | 79% | 2687 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,643 psi | 73% | 2736 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,856 psi | 62% | 2575 fps | 98.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,507 psi | 60% | 2585 fps | 98.1% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,579 psi | 59% | 2618 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 52,373 psi | 84% | 2694 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,948 psi | 74% | 2638 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,527 psi | 71% | 2631 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 86% | 39,102 psi | 63% | 2572 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 42,859 psi | 69% | 2569 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,785 psi | 67% | 2549 fps | 98.5% |
| Shooters World Precision | <<locked>> | 80% | 50,517 psi | 81% | 2684 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,943 psi | 64% | 2530 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,181 psi | 76% | 2694 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,036 psi | 75% | 2543 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,857 psi | 66% | 2497 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 41,350 psi | 66% | 2621 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 46,195 psi | 74% | 2638 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,501 psi | 78% | 2674 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 35,114 psi | 56% | 2507 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 37,289 psi | 60% | 2503 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 52,678 psi | 84% | 2654 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,692 psi | 84% | 2667 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,063 psi | 71% | 2566 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,147 psi | 64% | 2549 fps | 99% |
| Vihtavuori N165 | <<locked>> | 90% | 39,146 psi | 63% | 2536 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 50,908 psi | 82% | 2664 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,450 psi | 63% | 2549 fps | 98.7% |
| Vihtavuori N555 | <<locked>> | 80% | 30,821 psi | 49% | 2405 fps | 97.2% |
| Vihtavuori N560 | 71.6 gr | 94% | 48,950 psi | 78% | 2822 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 98% | 44,657 psi | 72% | 2733 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,102 psi | 63% | 2516 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 41,089 psi | 66% | 2608 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,627 psi | 39% | 2303 fps | 95.9% |
| Winchester Supreme 780 | <<locked>> | 90% | 41,829 psi | 67% | 2598 fps | 95.7% |
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 87 powders for .300 Win. Mag. loaded with the .308 | 185gr | Berger Classic Hybrid Hunter. Norma MRP delivers the highest muzzle velocity at 2,953 fps; across all powders the maximum-charge window runs from 1,739 fps to 2,953 fps. Alliant Reloder-22 gives the best case fill at 100 %, and 87 of the 87 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 185.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-22, 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. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for .300 Win. Mag. with the .308 | 185gr | Berger Classic Hybrid Hunter 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.