Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 190gr | Speer Boat Tail Hollow Point 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 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.
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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% | 54,723 psi | 88% | 2703 fps | 99.1% |
| Accurate 3100 | <<locked>> | 98% | 53,055 psi | 85% | 2753 fps | 99.8% |
| Accurate 4064 | <<locked>> | 82% | 54,230 psi | 87% | 2684 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,998 psi | 88% | 2795 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 55,013 psi | 88% | 2890 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 84% | 54,186 psi | 87% | 2720 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,941 psi | 90% | 2844 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 98% | 53,664 psi | 86% | 2841 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,085 psi | 88% | 2740 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,143 psi | 88% | 2759 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,883 psi | 90% | 2851 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 53,345 psi | 86% | 2818 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,376 psi | 89% | 2831 fps | 98.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,362 psi | 90% | 2890 fps | 99% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,476 psi | 86% | 2818 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,195 psi | 74% | 2753 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,316 psi | 85% | 2900 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,590 psi | 83% | 2815 fps | 98.3% |
| Bofors RP3 | <<locked>> | 84% | 55,927 psi | 90% | 2756 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,362 psi | 90% | 2890 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 55,027 psi | 88% | 2743 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,847 psi | 74% | 2694 fps | 96.4% |
| Hodgdon H380 | <<locked>> | 84% | 56,275 psi | 90% | 2776 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 53,621 psi | 86% | 2795 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 86% | 53,359 psi | 86% | 2756 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 96% | 53,534 psi | 86% | 2779 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,347 psi | 90% | 2825 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,101 psi | 90% | 2772 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,295 psi | 73% | 2792 fps | 97.8% |
| Hodgdon Superformance | <<locked>> | 88% | 53,519 psi | 86% | 2828 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,680 psi | 59% | 1713 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 53,606 psi | 86% | 2700 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,014 psi | 90% | 2736 fps | 99.6% |
| IMR 4350 | <<locked>> | 92% | 56,115 psi | 90% | 2779 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 53,272 psi | 85% | 2720 fps | 99.3% |
| IMR 4831 | <<locked>> | 92% | 55,579 psi | 89% | 2789 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,303 psi | 89% | 2772 fps | 97.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,549 psi | 87% | 2867 fps | 97.7% |
| Lovex S062 | <<locked>> | 82% | 53,882 psi | 86% | 2694 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 53,490 psi | 86% | 2717 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 54,752 psi | 88% | 2759 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,166 psi | 76% | 2661 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 54,476 psi | 87% | 2746 fps | 100% |
| Norma 204 | <<locked>> | 90% | 53,447 psi | 86% | 2779 fps | 98.3% |
| Norma MRP | <<locked>> | 98% | 55,941 psi | 90% | 2913 fps | 99.7% |
| Norma URP | <<locked>> | 90% | 53,635 psi | 86% | 2779 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,114 psi | 88% | 2772 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,143 psi | 88% | 2887 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 92% | 55,999 psi | 90% | 2835 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,269 psi | 79% | 2762 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,260 psi | 60% | 1749 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,043 psi | 90% | 2762 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 52,794 psi | 85% | 2808 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,853 psi | 88% | 2818 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 53,330 psi | 86% | 2848 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,310 psi | 73% | 2789 fps | 98.8% |
| Rottweil R 902 | <<locked>> | 82% | 55,767 psi | 89% | 2703 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,028 psi | 90% | 2753 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,085 psi | 87% | 2759 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 96% | 54,534 psi | 87% | 2818 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 88% | 55,027 psi | 88% | 2743 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 53,490 psi | 86% | 2717 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 53,882 psi | 86% | 2694 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,752 psi | 88% | 2759 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 53,925 psi | 86% | 2759 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 53,432 psi | 86% | 2592 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 53,142 psi | 85% | 2674 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,070 psi | 87% | 2812 fps | 98.7% |
| Somchem S355 | <<locked>> | 86% | 55,753 psi | 89% | 2746 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,593 psi | 89% | 2753 fps | 97.1% |
| Somchem S365 | <<locked>> | 92% | 53,171 psi | 85% | 2782 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,245 psi | 89% | 2795 fps | 99.3% |
| Vihtavuori N135 | <<locked>> | 82% | 56,217 psi | 90% | 2657 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,434 psi | 90% | 2677 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 53,621 psi | 86% | 2674 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,637 psi | 89% | 2772 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,433 psi | 87% | 2769 fps | 99% |
| Vihtavuori N540 | <<locked>> | 82% | 54,505 psi | 87% | 2674 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,969 psi | 88% | 2782 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,898 psi | 90% | 2841 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,159 psi | 90% | 2907 fps | 97.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,167 psi | 77% | 2759 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,361 psi | 89% | 2740 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 53,621 psi | 86% | 2795 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,936 psi | 78% | 2887 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,274 psi | 89% | 2789 fps | 98.7% |
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% | 51,242 psi | 82% | 2651 fps | 98.7% |
| Accurate 3100 | <<locked>> | 82% | 30,908 psi | 50% | 2326 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 50,966 psi | 82% | 2638 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,247 psi | 63% | 2526 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 94% | 47,863 psi | 77% | 2769 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 47,906 psi | 77% | 2618 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 40,292 psi | 65% | 2559 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 94% | 46,949 psi | 75% | 2720 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,457 psi | 78% | 2641 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,822 psi | 83% | 2710 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,029 psi | 61% | 2536 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,221 psi | 69% | 2654 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 40,147 psi | 64% | 2556 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 90% | 40,466 psi | 65% | 2608 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,920 psi | 45% | 2300 fps | 97.4% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,691 psi | 51% | 2421 fps | 95.8% |
| Alliant Reloder-26 | 61.7 gr | 80% | 29,878 psi | 48% | 2411 fps | 95.9% |
| Bofors RP15 | <<locked>> | 92% | 39,943 psi | 64% | 2595 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 49,008 psi | 79% | 2654 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 40,466 psi | 65% | 2608 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 42,931 psi | 69% | 2536 fps | 97.3% |
| Hodgdon H1000 | <<locked>> | 98% | 42,960 psi | 69% | 2635 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 49,226 psi | 79% | 2667 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 41,104 psi | 66% | 2572 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 80% | 43,932 psi | 70% | 2589 fps | 96.8% |
| Hodgdon H4831 | <<locked>> | 92% | 46,862 psi | 75% | 2667 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 94% | 49,240 psi | 79% | 2710 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,592 psi | 57% | 2431 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,784 psi | 64% | 2667 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 39,929 psi | 64% | 2582 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,311 psi | 44% | 1526 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,357 psi | 81% | 2651 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,446 psi | 84% | 2680 fps | 99.3% |
| IMR 4350 | <<locked>> | 80% | 38,624 psi | 62% | 2467 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,396 psi | 71% | 2566 fps | 98% |
| IMR 4831 | <<locked>> | 80% | 37,579 psi | 60% | 2480 fps | 98.8% |
| IMR 4955 Enduron | <<locked>> | 90% | 45,818 psi | 73% | 2612 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 94% | 44,744 psi | 72% | 2690 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 50,633 psi | 81% | 2644 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,872 psi | 67% | 2516 fps | 98.6% |
| Lovex S070 | <<locked>> | 80% | 40,248 psi | 65% | 2503 fps | 97.4% |
| Lovex S071 | <<locked>> | 88% | 32,227 psi | 52% | 2359 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 51,213 psi | 82% | 2697 fps | 100% |
| Norma 204 | <<locked>> | 82% | 40,669 psi | 65% | 2549 fps | 95.3% |
| Norma MRP | 62.9 gr | 84% | 34,592 psi | 55% | 2503 fps | 95% |
| Norma URP | <<locked>> | 80% | 38,957 psi | 62% | 2520 fps | 99% |
| Ramshot Big Game | <<locked>> | 80% | 51,576 psi | 83% | 2720 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 44,628 psi | 72% | 2700 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 37,594 psi | 60% | 2507 fps | 97.3% |
| Ramshot Magnum | <<locked>> | 92% | 36,825 psi | 59% | 2516 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,905 psi | 45% | 1565 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,240 psi | 79% | 2654 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,905 psi | 74% | 2703 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,870 psi | 62% | 2543 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,594 psi | 60% | 2549 fps | 98.3% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,637 psi | 59% | 2585 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 52,417 psi | 84% | 2654 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,267 psi | 74% | 2605 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,614 psi | 72% | 2598 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 86% | 39,218 psi | 63% | 2539 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 42,931 psi | 69% | 2536 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,872 psi | 67% | 2516 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 50,633 psi | 81% | 2644 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,248 psi | 65% | 2503 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,210 psi | 76% | 2654 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,297 psi | 76% | 2507 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,002 psi | 66% | 2464 fps | 97.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 38,856 psi | 62% | 2536 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 46,325 psi | 74% | 2602 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,834 psi | 78% | 2644 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 35,418 psi | 57% | 2480 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 37,362 psi | 60% | 2470 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 52,953 psi | 85% | 2618 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,055 psi | 85% | 2635 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,396 psi | 71% | 2533 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,306 psi | 65% | 2520 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 90% | 39,146 psi | 63% | 2503 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 51,082 psi | 82% | 2628 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,653 psi | 64% | 2520 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 80% | 31,067 psi | 50% | 2379 fps | 97.5% |
| Vihtavuori N560 | 68.9 gr | 92% | 45,934 psi | 74% | 2730 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 98% | 44,962 psi | 72% | 2703 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,189 psi | 63% | 2487 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,104 psi | 66% | 2572 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,656 psi | 40% | 2277 fps | 96.4% |
| Winchester Supreme 780 | <<locked>> | 88% | 39,204 psi | 63% | 2510 fps | 95% |
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 93 powders for .300 Win. Mag. loaded with the .308 | 190gr | Speer Boat Tail Hollow Point. Norma MRP delivers the highest muzzle velocity at 2,913 fps; across all powders the maximum-charge window runs from 1,713 fps to 2,913 fps. ADI AR 2217 gives the best case fill at 100 %, and 93 of the 93 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 190.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-22 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 | 190gr | Speer Boat Tail Hollow 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, Norma 217 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.