Load Specifications
Load data in caliber .300 Weath. Mag. with .31 | 200gr | Lapua D166 bullet and 74 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Vihtavuori N560 and Accurate MAGPRO.
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 3100 | <<locked>> | 94% | 55,970 psi | 88% | 2769 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 57,421 psi | 90% | 2799 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 54,549 psi | 85% | 2864 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 90% | 54,505 psi | 85% | 2802 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 94% | 55,941 psi | 88% | 2864 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,995 psi | 78% | 2762 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,773 psi | 70% | 2730 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,694 psi | 86% | 2802 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,564 psi | 87% | 2808 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,551 psi | 90% | 2844 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,970 psi | 88% | 2861 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 57,261 psi | 90% | 2828 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,478 psi | 89% | 2890 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 53,751 psi | 84% | 2861 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,377 psi | 90% | 2825 fps | 96.9% |
| Bofors RP15 | <<locked>> | 96% | 54,911 psi | 86% | 2841 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,373 psi | 82% | 2835 fps | 99% |
| Bofors RP5 | <<locked>> | 94% | 55,970 psi | 88% | 2861 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 55,927 psi | 88% | 2746 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,187 psi | 86% | 2851 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 84% | 55,347 psi | 87% | 2799 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 54,389 psi | 85% | 2756 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 55,709 psi | 87% | 2802 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,607 psi | 86% | 2785 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,897 psi | 86% | 2726 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,390 psi | 87% | 2963 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 55,608 psi | 87% | 2835 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,115 psi | 58% | 1729 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,682 psi | 90% | 2789 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,450 psi | 90% | 2769 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 57,711 psi | 90% | 2792 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,739 psi | 89% | 2785 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 96% | 57,551 psi | 90% | 2900 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 40,350 psi | 63% | 2635 fps | 96.1% |
| Lovex S065 | <<locked>> | 84% | 54,665 psi | 86% | 2717 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,391 psi | 88% | 2766 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 57,116 psi | 90% | 2785 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,955 psi | 86% | 2785 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 40,393 psi | 63% | 2657 fps | 98.4% |
| Norma MRP | <<locked>> | 92% | 55,840 psi | 88% | 2881 fps | 100% |
| Norma URP | <<locked>> | 86% | 55,811 psi | 87% | 2782 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,389 psi | 85% | 2864 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 54,549 psi | 85% | 2789 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,724 psi | 89% | 2858 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,087 psi | 60% | 1772 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 57,493 psi | 90% | 2825 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,767 psi | 87% | 2851 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,072 psi | 88% | 2959 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,879 psi | 80% | 2848 fps | 97.6% |
| Rottweil R 903 | <<locked>> | 82% | 57,392 psi | 90% | 2743 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,753 psi | 87% | 2776 fps | 99% |
| Rottweil R 905 | <<locked>> | 92% | 57,072 psi | 89% | 2835 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 55,927 psi | 88% | 2746 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,665 psi | 86% | 2717 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,391 psi | 88% | 2766 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,942 psi | 89% | 2612 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,392 psi | 90% | 2723 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,623 psi | 89% | 2831 fps | 99.7% |
| Somchem S355 | <<locked>> | 82% | 56,971 psi | 89% | 2736 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 57,188 psi | 90% | 2769 fps | 98.6% |
| Somchem S365 | <<locked>> | 88% | 56,362 psi | 88% | 2785 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,580 psi | 90% | 2808 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 54,607 psi | 86% | 2661 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,464 psi | 90% | 2772 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 57,246 psi | 90% | 2792 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 56,768 psi | 89% | 2782 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,970 psi | 88% | 2805 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,651 psi | 87% | 2877 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 98% | 55,477 psi | 87% | 2858 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,054 psi | 82% | 2851 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,087 psi | 89% | 2733 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,579 psi | 87% | 2802 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,998 psi | 86% | 2910 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,609 psi | 90% | 2808 fps | 99.7% |
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 3100 | <<locked>> | 80% | 35,056 psi | 55% | 2398 fps | 97.9% |
| Accurate 4350 | <<locked>> | 80% | 46,876 psi | 73% | 2638 fps | 100% |
| Accurate MAGPRO | 74.4 gr | 86% | 44,179 psi | 69% | 2677 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 39,117 psi | 61% | 2520 fps | 96.5% |
| ADI AR 2213 | <<locked>> | 84% | 39,813 psi | 62% | 2566 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 92% | 38,421 psi | 60% | 2533 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 90% | 32,416 psi | 51% | 2438 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,860 psi | 70% | 2644 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,851 psi | 81% | 2756 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,073 psi | 61% | 2513 fps | 96.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,041 psi | 55% | 2461 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,649 psi | 53% | 2425 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,341 psi | 46% | 2339 fps | 96.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,840 psi | 58% | 2559 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,821 psi | 80% | 2713 fps | 95.4% |
| Bofors RP15 | <<locked>> | 84% | 37,275 psi | 58% | 2510 fps | 95.9% |
| Bofors RP30 | <<locked>> | 90% | 37,391 psi | 59% | 2546 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 35,041 psi | 55% | 2461 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 49,371 psi | 77% | 2641 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 36,811 psi | 58% | 2497 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 48,414 psi | 76% | 2687 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 51,082 psi | 80% | 2703 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 84% | 42,627 psi | 67% | 2575 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,756 psi | 65% | 2556 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,395 psi | 66% | 2533 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 34,795 psi | 55% | 2533 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 48,066 psi | 75% | 2713 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,949 psi | 44% | 1549 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,875 psi | 70% | 2579 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,821 psi | 80% | 2667 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 44,585 psi | 70% | 2585 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 41,510 psi | 65% | 2516 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 86% | 41,002 psi | 64% | 2605 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 37,768 psi | 59% | 2575 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 48,298 psi | 76% | 2615 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 46,630 psi | 73% | 2608 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 30,284 psi | 47% | 2280 fps | 96.1% |
| Norma 204 | <<locked>> | 80% | 44,991 psi | 71% | 2618 fps | 97.9% |
| Norma 217 | <<locked>> | 94% | 33,141 psi | 52% | 2484 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 36,608 psi | 57% | 2526 fps | 97.3% |
| Norma URP | <<locked>> | 80% | 45,890 psi | 72% | 2625 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 38,043 psi | 60% | 2549 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 44,846 psi | 70% | 2625 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 33,910 psi | 53% | 2434 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,558 psi | 45% | 1585 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,934 psi | 74% | 2661 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,020 psi | 71% | 2677 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 31,647 psi | 50% | 2444 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 43,787 psi | 69% | 2717 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 53,838 psi | 84% | 2694 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,408 psi | 63% | 2500 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 38,580 psi | 60% | 2503 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 80% | 49,371 psi | 77% | 2641 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,298 psi | 76% | 2615 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 46,630 psi | 73% | 2608 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,679 psi | 84% | 2572 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,311 psi | 74% | 2569 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,247 psi | 60% | 2500 fps | 96.5% |
| Somchem S355 | <<locked>> | 80% | 53,563 psi | 84% | 2687 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 41,089 psi | 64% | 2490 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 43,062 psi | 67% | 2585 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,131 psi | 61% | 2490 fps | 97.6% |
| Vihtavuori N150 | <<locked>> | 80% | 51,242 psi | 80% | 2615 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,311 psi | 74% | 2618 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,765 psi | 53% | 2362 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 46,789 psi | 73% | 2625 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,898 psi | 59% | 2500 fps | 99.8% |
| Vihtavuori N560 | 71.4 gr | 84% | 42,250 psi | 66% | 2635 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 88% | 39,552 psi | 62% | 2566 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 96% | 45,223 psi | 71% | 2730 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,398 psi | 73% | 2582 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,631 psi | 76% | 2690 fps | 99.6% |
| Winchester StaBALL HD | 67.3 gr | 80% | 29,979 psi | 47% | 2448 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,578 psi | 56% | 2411 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 78 powders for .300 Weath. Mag. loaded with the .31 | 200gr | Lapua D166. Hodgdon Retumbo delivers the highest muzzle velocity at 2,963 fps; across all powders the maximum-charge window runs from 1,729 fps to 2,963 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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. Winchester StaBALL HD, Vihtavuori N560, Accurate MAGPRO rank at the top here: for .300 Weath. Mag. with the .31 | 200gr | Lapua D166 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 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.