Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 181gr | RWS UNI Classic bullet and 85 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% | 54,824 psi | 88% | 2782 fps | 99% |
| Accurate 3100 | <<locked>> | 98% | 53,359 psi | 86% | 2831 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 54,520 psi | 87% | 2766 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,332 psi | 89% | 2877 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 55,434 psi | 89% | 2969 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 84% | 54,317 psi | 87% | 2795 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,159 psi | 90% | 2923 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 98% | 53,824 psi | 86% | 2917 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,187 psi | 88% | 2818 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,274 psi | 89% | 2841 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,028 psi | 90% | 2930 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 53,708 psi | 86% | 2900 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,579 psi | 89% | 2910 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 53,084 psi | 85% | 2913 fps | 98.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,780 psi | 86% | 2897 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,601 psi | 75% | 2831 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,853 psi | 86% | 2982 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,054 psi | 83% | 2894 fps | 98.1% |
| Bofors RP3 | <<locked>> | 84% | 56,086 psi | 90% | 2835 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 53,084 psi | 85% | 2913 fps | 98.4% |
| Bofors RP7 | <<locked>> | 88% | 55,332 psi | 89% | 2825 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,093 psi | 74% | 2769 fps | 96.1% |
| Hodgdon H380 | <<locked>> | 84% | 56,362 psi | 90% | 2854 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 53,911 psi | 86% | 2877 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 86% | 53,359 psi | 86% | 2828 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 96% | 54,070 psi | 87% | 2861 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 96% | 52,866 psi | 85% | 2844 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,376 psi | 90% | 2854 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,600 psi | 73% | 2867 fps | 97.6% |
| Hodgdon Superformance | <<locked>> | 88% | 53,882 psi | 86% | 2907 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,593 psi | 59% | 1768 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 53,679 psi | 86% | 2779 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,043 psi | 90% | 2812 fps | 99.5% |
| IMR 4350 | <<locked>> | 90% | 53,156 psi | 85% | 2808 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 53,635 psi | 86% | 2802 fps | 99.2% |
| IMR 4831 | <<locked>> | 92% | 55,854 psi | 90% | 2871 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,463 psi | 89% | 2848 fps | 97.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,926 psi | 88% | 2949 fps | 97.6% |
| Lovex S062 | <<locked>> | 82% | 54,128 psi | 87% | 2776 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 53,795 psi | 86% | 2799 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 55,100 psi | 88% | 2841 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,442 psi | 76% | 2736 fps | 99.2% |
| Norma 203B | <<locked>> | 82% | 54,563 psi | 87% | 2825 fps | 100% |
| Norma 204 | <<locked>> | 90% | 53,592 psi | 86% | 2854 fps | 98.1% |
| Norma MRP | <<locked>> | 96% | 52,591 psi | 84% | 2936 fps | 99.3% |
| Norma URP | <<locked>> | 90% | 54,056 psi | 87% | 2861 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,390 psi | 89% | 2851 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,564 psi | 89% | 2969 fps | 98% |
| Ramshot Hunter | <<locked>> | 90% | 52,750 psi | 85% | 2861 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,792 psi | 80% | 2841 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,333 psi | 60% | 1811 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,275 psi | 90% | 2841 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 53,040 psi | 85% | 2887 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,143 psi | 88% | 2897 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 53,563 psi | 86% | 2927 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,672 psi | 73% | 2864 fps | 98.6% |
| Rottweil R 902 | <<locked>> | 82% | 55,854 psi | 90% | 2782 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,173 psi | 90% | 2831 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,215 psi | 87% | 2838 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 96% | 54,984 psi | 88% | 2900 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 88% | 55,332 psi | 89% | 2825 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 53,795 psi | 86% | 2799 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 54,128 psi | 87% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,100 psi | 88% | 2841 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,215 psi | 87% | 2841 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 53,505 psi | 86% | 2671 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 53,301 psi | 85% | 2749 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,505 psi | 87% | 2894 fps | 98.6% |
| Somchem S355 | <<locked>> | 86% | 55,999 psi | 90% | 2828 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,941 psi | 90% | 2831 fps | 96.9% |
| Somchem S365 | <<locked>> | 92% | 53,708 psi | 86% | 2864 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,535 psi | 89% | 2874 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 82% | 56,420 psi | 90% | 2740 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 53,824 psi | 86% | 2753 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,999 psi | 90% | 2854 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,839 psi | 88% | 2848 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 54,752 psi | 88% | 2753 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,187 psi | 88% | 2861 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,362 psi | 90% | 2923 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 52,779 psi | 85% | 2923 fps | 96.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,414 psi | 78% | 2835 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,724 psi | 89% | 2822 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 53,911 psi | 86% | 2877 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,226 psi | 79% | 2966 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,680 psi | 89% | 2867 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% | 51,488 psi | 83% | 2726 fps | 98.5% |
| Accurate 3100 | <<locked>> | 84% | 33,185 psi | 53% | 2441 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 51,082 psi | 82% | 2717 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,305 psi | 63% | 2595 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 96% | 51,590 psi | 83% | 2907 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 48,051 psi | 77% | 2697 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 40,567 psi | 65% | 2635 fps | 95% |
| ADI AR 2213 | <<locked>> | 94% | 47,166 psi | 76% | 2795 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,805 psi | 78% | 2720 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,851 psi | 83% | 2785 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,159 psi | 61% | 2608 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,439 psi | 70% | 2730 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 40,263 psi | 65% | 2628 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 90% | 40,727 psi | 65% | 2680 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,036 psi | 45% | 2362 fps | 97.1% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,836 psi | 51% | 2484 fps | 95.4% |
| Alliant Reloder-26 | 64.3 gr | 80% | 29,979 psi | 48% | 2470 fps | 95.4% |
| Bofors RP15 | <<locked>> | 92% | 40,176 psi | 64% | 2667 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 49,211 psi | 79% | 2733 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 40,727 psi | 65% | 2680 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 43,047 psi | 69% | 2608 fps | 97% |
| Hodgdon H1000 | <<locked>> | 98% | 43,149 psi | 69% | 2707 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 49,371 psi | 79% | 2743 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 41,205 psi | 66% | 2641 fps | 97.2% |
| Hodgdon H4350 | <<locked>> | 80% | 44,106 psi | 71% | 2664 fps | 96.6% |
| Hodgdon H4831 | <<locked>> | 94% | 50,343 psi | 81% | 2799 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 49,472 psi | 79% | 2785 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,723 psi | 57% | 2497 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 96% | 40,089 psi | 64% | 2740 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 40,234 psi | 65% | 2657 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,427 psi | 44% | 1581 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,517 psi | 81% | 2730 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,634 psi | 84% | 2759 fps | 99.2% |
| IMR 4350 | <<locked>> | 80% | 38,682 psi | 62% | 2536 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,440 psi | 71% | 2638 fps | 97.8% |
| IMR 4831 | <<locked>> | 80% | 37,840 psi | 61% | 2552 fps | 98.7% |
| IMR 4955 Enduron | <<locked>> | 92% | 49,110 psi | 79% | 2743 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 94% | 44,962 psi | 72% | 2766 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 50,792 psi | 81% | 2723 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,974 psi | 67% | 2589 fps | 98.4% |
| Lovex S070 | <<locked>> | 80% | 40,321 psi | 65% | 2572 fps | 97.1% |
| Lovex S071 | <<locked>> | 88% | 32,460 psi | 52% | 2425 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 51,213 psi | 82% | 2772 fps | 100% |
| Norma 204 | <<locked>> | 82% | 40,843 psi | 65% | 2618 fps | 95% |
| Norma MRP | 67.1 gr | 86% | 37,144 psi | 60% | 2628 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 39,044 psi | 63% | 2589 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 80% | 51,938 psi | 83% | 2802 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 44,904 psi | 72% | 2776 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 37,826 psi | 61% | 2579 fps | 97% |
| Ramshot Magnum | <<locked>> | 94% | 39,900 psi | 64% | 2651 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,978 psi | 45% | 1621 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,458 psi | 79% | 2730 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,122 psi | 74% | 2779 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,102 psi | 63% | 2615 fps | 98.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,898 psi | 61% | 2625 fps | 98.2% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 37,028 psi | 59% | 2657 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 52,620 psi | 84% | 2736 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,369 psi | 74% | 2680 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,875 psi | 72% | 2671 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 86% | 39,378 psi | 63% | 2608 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 43,047 psi | 69% | 2608 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,974 psi | 67% | 2589 fps | 98.4% |
| Shooters World Precision | <<locked>> | 80% | 50,792 psi | 81% | 2723 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,321 psi | 65% | 2572 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,500 psi | 76% | 2733 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,340 psi | 76% | 2582 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,205 psi | 66% | 2536 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 41,698 psi | 67% | 2661 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 46,441 psi | 74% | 2674 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,979 psi | 79% | 2717 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 35,505 psi | 57% | 2549 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 37,507 psi | 60% | 2539 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 53,040 psi | 85% | 2697 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,454 psi | 71% | 2608 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,335 psi | 65% | 2589 fps | 99% |
| Vihtavuori N165 | <<locked>> | 90% | 39,421 psi | 63% | 2575 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 51,227 psi | 82% | 2703 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,798 psi | 64% | 2589 fps | 98.7% |
| Vihtavuori N555 | <<locked>> | 80% | 31,198 psi | 50% | 2441 fps | 97.2% |
| Vihtavuori N560 | 73.4 gr | 94% | 49,443 psi | 79% | 2867 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 98% | 45,295 psi | 73% | 2776 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,450 psi | 63% | 2559 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 41,408 psi | 66% | 2648 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,831 psi | 40% | 2336 fps | 95.9% |
| Winchester Supreme 780 | <<locked>> | 90% | 42,235 psi | 68% | 2638 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 85 powders for .300 Win. Mag. loaded with the .308 | 181gr | RWS UNI Classic. Alliant Reloder-26 delivers the highest muzzle velocity at 2,982 fps; across all powders the maximum-charge window runs from 1,768 fps to 2,982 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 85 of the 85 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 181.0 gr projectile in 0.308" calls for a 1:13.5 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, Vihtavuori N560 rank at the top here: for .300 Win. Mag. with the .308 | 181gr | RWS UNI Classic 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.