Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 185gr | Berger JUG bullet and 86 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 2700 | <<locked>> | 82% | 53,954 psi | 87% | 2726 fps | 98.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,941 psi | 90% | 2828 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 53,679 psi | 86% | 2713 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,157 psi | 87% | 2822 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 54,230 psi | 87% | 2913 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 84% | 53,447 psi | 86% | 2746 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,158 psi | 88% | 2867 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 98% | 52,808 psi | 85% | 2858 fps | 97% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,362 psi | 90% | 2917 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,302 psi | 87% | 2766 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,592 psi | 88% | 2789 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,129 psi | 88% | 2877 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,347 psi | 90% | 2900 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,592 psi | 88% | 2854 fps | 98.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,637 psi | 89% | 2917 fps | 98.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,504 psi | 84% | 2841 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,643 psi | 73% | 2779 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,420 psi | 90% | 2982 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,908 psi | 82% | 2838 fps | 97.9% |
| Bofors RP3 | <<locked>> | 84% | 55,274 psi | 89% | 2785 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,637 psi | 89% | 2917 fps | 98.8% |
| Bofors RP7 | <<locked>> | 88% | 54,447 psi | 87% | 2772 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 84% | 55,419 psi | 89% | 2802 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 56,289 psi | 90% | 2874 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 88% | 56,043 psi | 90% | 2831 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 96% | 52,953 psi | 85% | 2805 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,448 psi | 89% | 2844 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,317 psi | 89% | 2799 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,701 psi | 72% | 2812 fps | 97.3% |
| Hodgdon Superformance | <<locked>> | 88% | 52,649 psi | 84% | 2851 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,651 psi | 59% | 1736 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,318 psi | 90% | 2776 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,274 psi | 89% | 2762 fps | 99.4% |
| IMR 4350 | <<locked>> | 92% | 55,419 psi | 89% | 2805 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,970 psi | 90% | 2795 fps | 99.5% |
| IMR 4831 | <<locked>> | 92% | 54,810 psi | 88% | 2815 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,028 psi | 90% | 2815 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,578 psi | 88% | 2795 fps | 96.9% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,882 psi | 86% | 2890 fps | 97.4% |
| Lovex S062 | <<locked>> | 82% | 53,156 psi | 85% | 2720 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,173 psi | 90% | 2792 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 54,085 psi | 87% | 2785 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,369 psi | 74% | 2680 fps | 99% |
| Norma 203B | <<locked>> | 82% | 53,896 psi | 86% | 2776 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,420 psi | 90% | 2861 fps | 98.6% |
| Norma MRP | <<locked>> | 98% | 55,114 psi | 88% | 2940 fps | 99.6% |
| Norma URP | <<locked>> | 90% | 52,939 psi | 85% | 2805 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,418 psi | 87% | 2799 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,375 psi | 87% | 2910 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 55,405 psi | 89% | 2864 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,573 psi | 78% | 2785 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,217 psi | 60% | 1775 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,201 psi | 89% | 2785 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,825 psi | 90% | 2887 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,230 psi | 87% | 2844 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,231 psi | 90% | 2927 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,643 psi | 72% | 2805 fps | 98.3% |
| Rottweil R 902 | <<locked>> | 82% | 55,027 psi | 88% | 2730 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,361 psi | 89% | 2782 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 53,374 psi | 86% | 2782 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 96% | 53,664 psi | 86% | 2838 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 54,447 psi | 87% | 2772 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,173 psi | 90% | 2792 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 53,156 psi | 85% | 2720 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,085 psi | 87% | 2785 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 53,272 psi | 85% | 2789 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,159 psi | 90% | 2664 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,941 psi | 90% | 2749 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 53,200 psi | 85% | 2831 fps | 98.4% |
| Somchem S355 | <<locked>> | 86% | 55,187 psi | 88% | 2776 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,027 psi | 88% | 2779 fps | 96.7% |
| Somchem S365 | <<locked>> | 94% | 56,159 psi | 90% | 2861 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,360 psi | 87% | 2815 fps | 99.1% |
| Vihtavuori N135 | <<locked>> | 82% | 55,448 psi | 89% | 2690 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,666 psi | 89% | 2707 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 53,055 psi | 85% | 2703 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,926 psi | 88% | 2799 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,766 psi | 86% | 2792 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 82% | 53,766 psi | 86% | 2700 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,259 psi | 87% | 2808 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,984 psi | 88% | 2867 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,390 psi | 89% | 2930 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,563 psi | 87% | 2766 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 52,910 psi | 85% | 2818 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,718 psi | 77% | 2907 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,331 psi | 87% | 2808 fps | 98.3% |
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% | 50,546 psi | 81% | 2671 fps | 98.4% |
| Accurate 3100 | <<locked>> | 84% | 32,503 psi | 52% | 2395 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 50,459 psi | 81% | 2671 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,580 psi | 62% | 2546 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 96% | 50,575 psi | 81% | 2851 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 47,268 psi | 76% | 2644 fps | 100% |
| ADI AR 2209 | <<locked>> | 88% | 42,598 psi | 68% | 2641 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 94% | 46,253 psi | 74% | 2740 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,605 psi | 84% | 2858 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,022 psi | 77% | 2671 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,111 psi | 82% | 2736 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,463 psi | 60% | 2556 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,438 psi | 68% | 2674 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,177 psi | 68% | 2631 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 39,697 psi | 64% | 2625 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,601 psi | 44% | 2320 fps | 96.9% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,256 psi | 50% | 2438 fps | 95.2% |
| Alliant Reloder-26 | 62.2 gr | 80% | 29,443 psi | 47% | 2425 fps | 95.2% |
| Bofors RP15 | <<locked>> | 94% | 41,901 psi | 67% | 2671 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 48,269 psi | 77% | 2680 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 39,697 psi | 64% | 2625 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 42,366 psi | 68% | 2556 fps | 96.9% |
| Hodgdon H380 | <<locked>> | 80% | 48,718 psi | 78% | 2697 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 40,451 psi | 65% | 2592 fps | 97% |
| Hodgdon H4350 | <<locked>> | 80% | 43,279 psi | 69% | 2608 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 94% | 49,443 psi | 79% | 2746 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 48,559 psi | 78% | 2730 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,983 psi | 56% | 2451 fps | 99.3% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,305 psi | 63% | 2684 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 39,378 psi | 63% | 2602 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,354 psi | 44% | 1549 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,748 psi | 80% | 2677 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,040 psi | 83% | 2710 fps | 99.1% |
| IMR 4350 | <<locked>> | 80% | 38,072 psi | 61% | 2487 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,787 psi | 70% | 2589 fps | 97.7% |
| IMR 4831 | <<locked>> | 80% | 36,970 psi | 59% | 2497 fps | 98.5% |
| IMR 4895 | <<locked>> | 80% | 52,431 psi | 84% | 2762 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,124 psi | 77% | 2684 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 96% | 47,195 psi | 76% | 2772 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 49,966 psi | 80% | 2671 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,466 psi | 66% | 2543 fps | 98.3% |
| Lovex S070 | <<locked>> | 80% | 39,682 psi | 64% | 2523 fps | 96.9% |
| Lovex S071 | <<locked>> | 90% | 33,765 psi | 54% | 2425 fps | 95.8% |
| Norma 203B | <<locked>> | 80% | 50,502 psi | 81% | 2723 fps | 100% |
| Norma 204 | <<locked>> | 84% | 43,033 psi | 69% | 2628 fps | 95.8% |
| Norma MRP | 64.9 gr | 86% | 36,492 psi | 59% | 2579 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 38,348 psi | 61% | 2543 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 80% | 50,966 psi | 82% | 2746 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 43,903 psi | 70% | 2717 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 37,101 psi | 59% | 2526 fps | 96.9% |
| Ramshot Magnum | <<locked>> | 94% | 39,015 psi | 63% | 2598 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,920 psi | 45% | 1588 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,501 psi | 78% | 2677 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,092 psi | 72% | 2726 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,348 psi | 61% | 2566 fps | 98.5% |
| ReloadSwiss RS 70 | 61.6 gr | 80% | 37,101 psi | 59% | 2569 fps | 97.9% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,158 psi | 58% | 2602 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 51,750 psi | 83% | 2680 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,585 psi | 73% | 2631 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,920 psi | 75% | 2674 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 88% | 41,292 psi | 66% | 2615 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 42,366 psi | 68% | 2556 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,466 psi | 66% | 2543 fps | 98.3% |
| Shooters World Precision | <<locked>> | 80% | 49,966 psi | 80% | 2671 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,682 psi | 64% | 2523 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,673 psi | 75% | 2684 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,731 psi | 75% | 2533 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,451 psi | 65% | 2484 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,901 psi | 66% | 2608 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 45,890 psi | 74% | 2628 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,196 psi | 77% | 2664 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 34,780 psi | 56% | 2500 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 36,869 psi | 59% | 2490 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 52,301 psi | 84% | 2648 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,359 psi | 84% | 2661 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,758 psi | 70% | 2559 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,682 psi | 64% | 2536 fps | 98.9% |
| Vihtavuori N165 | <<locked>> | 90% | 38,580 psi | 62% | 2523 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 50,604 psi | 81% | 2657 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,175 psi | 63% | 2539 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 30,487 psi | 49% | 2395 fps | 97% |
| Vihtavuori N560 | <<locked>> | 94% | 48,356 psi | 78% | 2808 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,696 psi | 62% | 2507 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 40,611 psi | 65% | 2595 fps | 97% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,337 psi | 39% | 2287 fps | 95.5% |
| Winchester Supreme 780 | <<locked>> | 90% | 41,263 psi | 66% | 2582 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 86 powders for .300 Win. Mag. loaded with the .308 | 185gr | Berger JUG. Alliant Reloder-26 delivers the highest muzzle velocity at 2,982 fps; across all powders the maximum-charge window runs from 1,736 fps to 2,982 fps. Accurate 3100 gives the best case fill at 100 %, and 86 of the 86 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 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, Alliant Reloder-23 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 | 185gr | Berger JUG 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.