Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 180gr | Speer Magnum Tip Soft Point bullet and 88 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>> | 86% | 55,999 psi | 90% | 2792 fps | 99.1% |
| Accurate 3100 | <<locked>> | 98% | 53,185 psi | 85% | 2831 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 54,360 psi | 87% | 2769 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,129 psi | 88% | 2877 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 56,159 psi | 90% | 2976 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 84% | 54,186 psi | 87% | 2802 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,970 psi | 90% | 2923 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 98% | 53,664 psi | 86% | 2917 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,042 psi | 88% | 2822 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,129 psi | 88% | 2844 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,840 psi | 90% | 2936 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 53,505 psi | 86% | 2904 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,361 psi | 89% | 2910 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 98% | 52,852 psi | 85% | 2913 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,577 psi | 86% | 2900 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,398 psi | 74% | 2835 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,592 psi | 86% | 2986 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,822 psi | 83% | 2897 fps | 98% |
| Bofors RP3 | <<locked>> | 84% | 55,927 psi | 90% | 2838 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 52,852 psi | 85% | 2913 fps | 98.3% |
| Bofors RP7 | <<locked>> | 88% | 55,187 psi | 88% | 2828 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 84% | 56,260 psi | 90% | 2858 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,940 psi | 88% | 2897 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 90% | 55,288 psi | 89% | 2867 fps | 98.7% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 52,895 psi | 85% | 2848 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,347 psi | 90% | 2900 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,173 psi | 90% | 2858 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,317 psi | 87% | 2844 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,411 psi | 73% | 2867 fps | 97.5% |
| Hodgdon Superformance | <<locked>> | 88% | 53,664 psi | 86% | 2910 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,506 psi | 59% | 1772 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 53,650 psi | 86% | 2789 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 53,316 psi | 85% | 2779 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,216 psi | 89% | 2805 fps | 99.4% |
| IMR 4350 | <<locked>> | 92% | 56,420 psi | 90% | 2864 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 53,505 psi | 86% | 2805 fps | 99.2% |
| IMR 4831 | <<locked>> | 94% | 53,301 psi | 85% | 2838 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,274 psi | 89% | 2851 fps | 97% |
| IMR 7828 SSC | <<locked>> | 98% | 55,216 psi | 89% | 2956 fps | 97.5% |
| Lovex S062 | <<locked>> | 82% | 54,012 psi | 87% | 2776 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 53,650 psi | 86% | 2802 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 54,984 psi | 88% | 2844 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,471 psi | 76% | 2740 fps | 99.1% |
| Norma 203B | <<locked>> | 82% | 54,433 psi | 87% | 2828 fps | 100% |
| Norma 204 | <<locked>> | 90% | 53,388 psi | 86% | 2858 fps | 98% |
| Norma MRP | <<locked>> | 98% | 56,275 psi | 90% | 2999 fps | 99.6% |
| Norma URP | <<locked>> | 90% | 53,882 psi | 86% | 2864 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,448 psi | 89% | 2858 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,027 psi | 88% | 2963 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 56,275 psi | 90% | 2920 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,825 psi | 90% | 2943 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,231 psi | 60% | 1814 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,115 psi | 90% | 2844 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 52,852 psi | 85% | 2890 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,187 psi | 88% | 2904 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 53,345 psi | 86% | 2927 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,455 psi | 73% | 2864 fps | 98.5% |
| Rottweil R 902 | <<locked>> | 82% | 55,738 psi | 89% | 2785 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,043 psi | 90% | 2835 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,056 psi | 87% | 2838 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 96% | 54,795 psi | 88% | 2900 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 88% | 55,187 psi | 88% | 2828 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 53,650 psi | 86% | 2802 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 54,012 psi | 87% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,984 psi | 88% | 2844 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,070 psi | 87% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 53,388 psi | 86% | 2674 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 53,171 psi | 85% | 2753 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,317 psi | 87% | 2894 fps | 98.5% |
| Somchem S355 | <<locked>> | 86% | 55,869 psi | 90% | 2831 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,724 psi | 89% | 2831 fps | 96.8% |
| Somchem S365 | <<locked>> | 92% | 53,490 psi | 86% | 2867 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,376 psi | 89% | 2874 fps | 99.2% |
| Unknown powder | <<locked>> | 88% | 54,273 psi | 87% | 2864 fps | 100% |
| Vihtavuori N133 | <<locked>> | 82% | 55,854 psi | 90% | 2694 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 56,304 psi | 90% | 2746 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,579 psi | 89% | 2749 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,172 psi | 87% | 2766 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,737 psi | 88% | 2838 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,721 psi | 85% | 2822 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 82% | 55,303 psi | 89% | 2776 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 55,274 psi | 89% | 2884 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,144 psi | 90% | 2927 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 53,098 psi | 85% | 2940 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,506 psi | 89% | 2825 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,940 psi | 88% | 2897 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,182 psi | 79% | 2969 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 53,476 psi | 86% | 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% | 46,209 psi | 74% | 2631 fps | 97.5% |
| Accurate 3100 | <<locked>> | 84% | 33,083 psi | 53% | 2444 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 50,966 psi | 82% | 2720 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,175 psi | 63% | 2598 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 98% | 52,301 psi | 84% | 2913 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 47,950 psi | 77% | 2700 fps | 100% |
| ADI AR 2209 | <<locked>> | 88% | 43,192 psi | 69% | 2694 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 94% | 46,992 psi | 75% | 2795 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,689 psi | 78% | 2723 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,735 psi | 83% | 2792 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,058 psi | 61% | 2608 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,294 psi | 69% | 2733 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,801 psi | 69% | 2687 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 90% | 40,567 psi | 65% | 2680 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,949 psi | 45% | 2365 fps | 96.9% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,734 psi | 51% | 2484 fps | 95.2% |
| Alliant Reloder-26 | 64.4 gr | 80% | 29,863 psi | 48% | 2470 fps | 95.2% |
| Bofors RP15 | <<locked>> | 94% | 42,728 psi | 69% | 2726 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 49,081 psi | 79% | 2736 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 40,567 psi | 65% | 2680 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 42,946 psi | 69% | 2612 fps | 96.9% |
| Hodgdon H380 | <<locked>> | 80% | 49,458 psi | 79% | 2749 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 44,628 psi | 72% | 2717 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 80% | 40,364 psi | 65% | 2589 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 98% | 49,748 psi | 80% | 2795 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 49,313 psi | 79% | 2785 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,621 psi | 57% | 2500 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,966 psi | 82% | 2792 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,914 psi | 64% | 2740 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 40,103 psi | 64% | 2657 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,369 psi | 44% | 1585 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,531 psi | 81% | 2740 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,065 psi | 75% | 2677 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,108 psi | 74% | 2651 fps | 98.1% |
| IMR 4350 | <<locked>> | 80% | 38,595 psi | 62% | 2539 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,353 psi | 71% | 2641 fps | 97.7% |
| IMR 4831 | <<locked>> | 80% | 34,200 psi | 55% | 2470 fps | 97.6% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,994 psi | 79% | 2746 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 94% | 48,298 psi | 77% | 2835 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 50,676 psi | 81% | 2726 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,872 psi | 67% | 2589 fps | 98.3% |
| Lovex S070 | <<locked>> | 80% | 40,219 psi | 64% | 2572 fps | 97% |
| Lovex S071 | <<locked>> | 88% | 32,343 psi | 52% | 2428 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 51,097 psi | 82% | 2779 fps | 100% |
| Norma 204 | <<locked>> | 84% | 43,685 psi | 70% | 2684 fps | 95.8% |
| Norma MRP | 67.2 gr | 86% | 36,999 psi | 59% | 2628 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 38,928 psi | 62% | 2592 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 80% | 51,779 psi | 83% | 2805 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 44,121 psi | 71% | 2762 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 37,739 psi | 61% | 2579 fps | 96.9% |
| Ramshot Magnum | <<locked>> | 90% | 38,305 psi | 61% | 2618 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,920 psi | 45% | 1621 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,342 psi | 79% | 2733 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,006 psi | 74% | 2782 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,972 psi | 62% | 2615 fps | 98.5% |
| ReloadSwiss RS 70 | 63.9 gr | 80% | 37,782 psi | 61% | 2625 fps | 98% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,883 psi | 59% | 2657 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 52,518 psi | 84% | 2740 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,253 psi | 74% | 2684 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,730 psi | 72% | 2671 fps | 95% |
| Rottweil R 905 | <<locked>> | 88% | 41,959 psi | 67% | 2667 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 42,946 psi | 69% | 2612 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,872 psi | 67% | 2589 fps | 98.3% |
| Shooters World Precision | <<locked>> | 80% | 50,676 psi | 81% | 2726 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,219 psi | 64% | 2572 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,369 psi | 76% | 2736 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,253 psi | 76% | 2585 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,118 psi | 66% | 2539 fps | 97.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 41,582 psi | 67% | 2664 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 46,340 psi | 74% | 2680 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,820 psi | 78% | 2717 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 35,389 psi | 57% | 2549 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 37,391 psi | 60% | 2543 fps | 95.2% |
| Unknown powder | <<locked>> | 80% | 41,771 psi | 67% | 2644 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 80% | 52,837 psi | 85% | 2651 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 52,924 psi | 85% | 2700 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,359 psi | 84% | 2707 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,929 psi | 64% | 2533 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,974 psi | 67% | 2621 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 90% | 38,058 psi | 61% | 2549 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 51,967 psi | 83% | 2730 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,612 psi | 68% | 2664 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 31,096 psi | 50% | 2444 fps | 97.1% |
| Vihtavuori N560 | <<locked>> | 94% | 46,572 psi | 75% | 2818 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,320 psi | 63% | 2559 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 44,628 psi | 72% | 2717 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,743 psi | 40% | 2336 fps | 95.7% |
| Winchester Supreme 780 | <<locked>> | 88% | 43,018 psi | 69% | 2657 fps | 95.8% |
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 97 powders for .300 Win. Mag. loaded with the .308 | 180gr | Speer Magnum Tip Soft Point. Norma MRP delivers the highest muzzle velocity at 2,999 fps; across all powders the maximum-charge window runs from 1,772 fps to 2,999 fps. Accurate MAGPRO gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate MAGPRO, ADI AR 2217, ADI AR 2225 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 | Speer Magnum Tip Soft Point they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, Baschieri & Pellagri 109, Bofors RP30 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.