Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 180gr | Speer Hot-Cor 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 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% | 55,927 psi | 90% | 2792 fps | 99.1% |
| Accurate 3100 | <<locked>> | 98% | 53,084 psi | 85% | 2831 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 54,288 psi | 87% | 2769 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,056 psi | 88% | 2877 fps | 100% |
| ADI AR 2208 | <<locked>> | 84% | 54,114 psi | 87% | 2799 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,898 psi | 90% | 2923 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 98% | 53,577 psi | 86% | 2913 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,955 psi | 88% | 2822 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,056 psi | 88% | 2841 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,767 psi | 89% | 2933 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 53,432 psi | 86% | 2900 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,317 psi | 89% | 2910 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 98% | 52,808 psi | 85% | 2913 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,490 psi | 86% | 2897 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,369 psi | 74% | 2831 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,519 psi | 86% | 2982 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,779 psi | 83% | 2894 fps | 98% |
| Bofors RP3 | <<locked>> | 84% | 55,840 psi | 90% | 2838 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 52,808 psi | 85% | 2913 fps | 98.3% |
| Bofors RP7 | <<locked>> | 88% | 55,129 psi | 88% | 2825 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 84% | 56,188 psi | 90% | 2858 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,636 psi | 88% | 2890 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 90% | 55,230 psi | 89% | 2864 fps | 98.7% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 52,866 psi | 85% | 2848 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,260 psi | 90% | 2900 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,115 psi | 90% | 2854 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,244 psi | 87% | 2841 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,353 psi | 73% | 2867 fps | 97.4% |
| Hodgdon Superformance | <<locked>> | 88% | 53,621 psi | 86% | 2910 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,579 psi | 59% | 1772 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 53,563 psi | 86% | 2789 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 53,229 psi | 85% | 2776 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,143 psi | 88% | 2802 fps | 99.4% |
| IMR 4350 | <<locked>> | 92% | 56,362 psi | 90% | 2864 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 53,432 psi | 86% | 2802 fps | 99.2% |
| IMR 4831 | <<locked>> | 94% | 52,982 psi | 85% | 2831 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,230 psi | 89% | 2851 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 98% | 55,158 psi | 88% | 2956 fps | 97.5% |
| Lovex S062 | <<locked>> | 82% | 53,925 psi | 86% | 2776 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 53,592 psi | 86% | 2799 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 54,897 psi | 88% | 2841 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,195 psi | 76% | 2736 fps | 99.1% |
| Norma 203B | <<locked>> | 82% | 54,346 psi | 87% | 2828 fps | 100% |
| Norma 204 | <<locked>> | 90% | 53,345 psi | 86% | 2858 fps | 98% |
| Norma MRP | <<locked>> | 98% | 56,173 psi | 90% | 2999 fps | 99.6% |
| Norma URP | <<locked>> | 90% | 53,809 psi | 86% | 2864 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,143 psi | 88% | 2854 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,998 psi | 88% | 2963 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 56,231 psi | 90% | 2920 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,796 psi | 89% | 2943 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,318 psi | 60% | 1814 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,057 psi | 90% | 2844 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 52,779 psi | 85% | 2890 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,129 psi | 88% | 2904 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 53,287 psi | 85% | 2923 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,426 psi | 73% | 2861 fps | 98.4% |
| Rottweil R 902 | <<locked>> | 82% | 55,651 psi | 89% | 2785 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,956 psi | 90% | 2835 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,012 psi | 87% | 2838 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 96% | 54,708 psi | 88% | 2897 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 88% | 55,129 psi | 88% | 2825 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 53,592 psi | 86% | 2799 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 53,925 psi | 86% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,897 psi | 88% | 2841 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 53,969 psi | 87% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 53,316 psi | 85% | 2671 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 53,127 psi | 85% | 2753 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,273 psi | 87% | 2894 fps | 98.5% |
| Somchem S355 | <<locked>> | 86% | 55,767 psi | 89% | 2828 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,709 psi | 89% | 2831 fps | 96.8% |
| Somchem S365 | <<locked>> | 92% | 53,417 psi | 86% | 2867 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,332 psi | 89% | 2874 fps | 99.1% |
| Unknown powder | <<locked>> | 88% | 54,201 psi | 87% | 2864 fps | 100% |
| Vihtavuori N133 | <<locked>> | 82% | 55,753 psi | 89% | 2690 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 56,202 psi | 90% | 2743 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,492 psi | 89% | 2749 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,099 psi | 87% | 2766 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,679 psi | 88% | 2838 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,692 psi | 84% | 2818 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 82% | 55,216 psi | 89% | 2776 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 55,201 psi | 89% | 2884 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,057 psi | 90% | 2927 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 53,069 psi | 85% | 2936 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,463 psi | 89% | 2822 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,636 psi | 88% | 2890 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,139 psi | 79% | 2969 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 53,200 psi | 85% | 2835 fps | 98.1% |
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% | 46,151 psi | 74% | 2628 fps | 97.5% |
| Accurate 3100 | <<locked>> | 84% | 32,996 psi | 53% | 2444 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 50,923 psi | 82% | 2720 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,262 psi | 63% | 2598 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 47,877 psi | 77% | 2697 fps | 100% |
| ADI AR 2209 | <<locked>> | 88% | 43,134 psi | 69% | 2694 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 94% | 46,949 psi | 75% | 2795 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,588 psi | 78% | 2723 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,880 psi | 83% | 2792 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,985 psi | 61% | 2608 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,207 psi | 69% | 2730 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,743 psi | 69% | 2684 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 90% | 40,509 psi | 65% | 2680 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,891 psi | 45% | 2362 fps | 96.9% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,691 psi | 51% | 2484 fps | 95.2% |
| Alliant Reloder-26 | 64.3 gr | 80% | 29,805 psi | 48% | 2470 fps | 95.2% |
| Bofors RP15 | <<locked>> | 94% | 42,670 psi | 68% | 2726 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 48,994 psi | 79% | 2736 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 40,509 psi | 65% | 2680 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 42,873 psi | 69% | 2608 fps | 96.9% |
| Hodgdon H380 | <<locked>> | 80% | 49,371 psi | 79% | 2749 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 44,556 psi | 71% | 2713 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 80% | 40,292 psi | 65% | 2589 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 98% | 49,472 psi | 79% | 2789 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 49,240 psi | 79% | 2782 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,534 psi | 57% | 2500 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,879 psi | 82% | 2792 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,885 psi | 64% | 2740 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 40,045 psi | 64% | 2654 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,412 psi | 44% | 1585 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,459 psi | 81% | 2740 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,978 psi | 75% | 2674 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,035 psi | 74% | 2648 fps | 98.1% |
| IMR 4350 | <<locked>> | 80% | 38,522 psi | 62% | 2536 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,280 psi | 71% | 2638 fps | 97.7% |
| IMR 4831 | <<locked>> | 80% | 34,127 psi | 55% | 2470 fps | 97.6% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,907 psi | 78% | 2743 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 94% | 48,037 psi | 77% | 2831 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 50,589 psi | 81% | 2726 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,800 psi | 67% | 2589 fps | 98.3% |
| Lovex S070 | <<locked>> | 80% | 40,147 psi | 64% | 2572 fps | 96.9% |
| Lovex S071 | <<locked>> | 88% | 32,285 psi | 52% | 2425 fps | 95% |
| Norma 203B | <<locked>> | 80% | 51,242 psi | 82% | 2779 fps | 100% |
| Norma 204 | <<locked>> | 84% | 43,627 psi | 70% | 2680 fps | 95.8% |
| Norma MRP | 67.1 gr | 86% | 36,941 psi | 59% | 2628 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 38,856 psi | 62% | 2589 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 80% | 51,706 psi | 83% | 2802 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 44,092 psi | 71% | 2762 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 37,666 psi | 60% | 2579 fps | 96.9% |
| Ramshot Magnum | <<locked>> | 90% | 38,087 psi | 61% | 2615 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,963 psi | 45% | 1624 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,269 psi | 79% | 2733 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,919 psi | 74% | 2782 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,899 psi | 62% | 2615 fps | 98.5% |
| ReloadSwiss RS 70 | 63.8 gr | 80% | 37,724 psi | 60% | 2625 fps | 98% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,840 psi | 59% | 2657 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 52,417 psi | 84% | 2736 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,166 psi | 74% | 2684 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,672 psi | 72% | 2671 fps | 95% |
| Rottweil R 905 | <<locked>> | 88% | 41,872 psi | 67% | 2667 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 42,873 psi | 69% | 2608 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,800 psi | 67% | 2589 fps | 98.3% |
| Shooters World Precision | <<locked>> | 80% | 50,589 psi | 81% | 2726 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,147 psi | 64% | 2572 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,297 psi | 76% | 2736 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,166 psi | 76% | 2582 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,031 psi | 66% | 2536 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 41,495 psi | 67% | 2661 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 46,253 psi | 74% | 2677 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,791 psi | 78% | 2717 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 35,302 psi | 57% | 2546 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 37,333 psi | 60% | 2539 fps | 95.1% |
| Unknown powder | <<locked>> | 80% | 41,872 psi | 67% | 2648 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 80% | 52,736 psi | 85% | 2651 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 52,823 psi | 85% | 2697 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,272 psi | 84% | 2707 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,856 psi | 64% | 2530 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,901 psi | 67% | 2621 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 92% | 40,611 psi | 65% | 2602 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 51,880 psi | 83% | 2730 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,540 psi | 68% | 2661 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 31,024 psi | 50% | 2441 fps | 97% |
| Vihtavuori N560 | <<locked>> | 94% | 46,528 psi | 75% | 2815 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,262 psi | 63% | 2559 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 44,556 psi | 71% | 2713 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,700 psi | 40% | 2333 fps | 95.6% |
| Winchester Supreme 780 | <<locked>> | 88% | 42,975 psi | 69% | 2654 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 Hot-Cor. 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 1:14.5 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 Hot-Cor 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.