Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 185gr | Berger Classic Hybrid Hunter bullet and 79 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, 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>> | 96% | 55,651 psi | 87% | 2861 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 57,232 psi | 90% | 2897 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 54,157 psi | 85% | 2949 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 82% | 55,042 psi | 86% | 2808 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 54,157 psi | 85% | 2894 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 96% | 55,535 psi | 87% | 2953 fps | 98.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,412 psi | 73% | 2782 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,365 psi | 65% | 2743 fps | 98.3% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,418 psi | 85% | 2890 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,333 psi | 88% | 2831 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,491 psi | 85% | 2904 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,477 psi | 87% | 2917 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,450 psi | 90% | 2943 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,347 psi | 87% | 2949 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,449 psi | 88% | 2923 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,083 psi | 82% | 2927 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 57,000 psi | 89% | 3018 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 57,638 psi | 90% | 2910 fps | 95.9% |
| Bofors RP15 | <<locked>> | 98% | 54,288 psi | 85% | 2930 fps | 99% |
| Bofors RP3 | <<locked>> | 82% | 57,406 psi | 90% | 2851 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,979 psi | 75% | 2854 fps | 97.5% |
| Bofors RP5 | <<locked>> | 96% | 55,347 psi | 87% | 2949 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 56,289 psi | 88% | 2844 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,227 psi | 80% | 2874 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 82% | 57,377 psi | 90% | 2871 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 55,274 psi | 87% | 2897 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 54,534 psi | 85% | 2854 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 94% | 55,695 psi | 87% | 2894 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,549 psi | 85% | 2874 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,781 psi | 86% | 2825 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,068 psi | 80% | 2986 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 86% | 55,738 psi | 87% | 2936 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,999 psi | 58% | 1791 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,653 psi | 90% | 2881 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,404 psi | 85% | 2818 fps | 99.7% |
| IMR 4831 | <<locked>> | 90% | 57,595 psi | 90% | 2890 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,956 psi | 89% | 2881 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 98% | 56,956 psi | 89% | 2986 fps | 98.6% |
| Lovex S065 | <<locked>> | 86% | 54,897 psi | 86% | 2818 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,304 psi | 88% | 2861 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,968 psi | 83% | 2822 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 54,955 psi | 86% | 2881 fps | 98.9% |
| Norma 217ᴾ | <<locked>> | 100% | 36,854 psi | 58% | 2661 fps | 96.1% |
| Norma MRP | <<locked>> | 94% | 55,230 psi | 87% | 2972 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 55,564 psi | 87% | 2881 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 53,925 psi | 85% | 2949 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 88% | 54,375 psi | 85% | 2884 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,028 psi | 88% | 2943 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,739 psi | 59% | 1834 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,043 psi | 89% | 2854 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,911 psi | 86% | 2904 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,174 psi | 90% | 2923 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,564 psi | 87% | 2953 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,488 psi | 81% | 2982 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 84% | 57,493 psi | 90% | 2848 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,695 psi | 87% | 2864 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 94% | 56,884 psi | 89% | 2930 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 86% | 56,289 psi | 88% | 2844 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,897 psi | 86% | 2818 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,304 psi | 88% | 2861 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,361 psi | 87% | 2854 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,609 psi | 90% | 2720 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,041 psi | 85% | 2769 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,434 psi | 88% | 2923 fps | 99.3% |
| Somchem S355 | <<locked>> | 84% | 57,203 psi | 90% | 2841 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,305 psi | 90% | 2861 fps | 97.9% |
| Somchem S365 | <<locked>> | 90% | 55,695 psi | 87% | 2881 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,464 psi | 90% | 2904 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 84% | 54,853 psi | 86% | 2762 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,508 psi | 90% | 2874 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,884 psi | 89% | 2881 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 88% | 56,782 psi | 89% | 2881 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,245 psi | 87% | 2900 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 55,187 psi | 86% | 2966 fps | 97.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,592 psi | 86% | 2940 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 57,029 psi | 89% | 2835 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,506 psi | 87% | 2900 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 53,447 psi | 84% | 3002 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,580 psi | 90% | 2900 fps | 99.3% |
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% | 32,387 psi | 51% | 2418 fps | 96% |
| Accurate 4350 | <<locked>> | 80% | 43,555 psi | 68% | 2677 fps | 99.8% |
| Accurate MAGPRO | 77.4 gr | 90% | 46,905 psi | 74% | 2822 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 51,706 psi | 81% | 2756 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 39,015 psi | 61% | 2602 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 88% | 42,540 psi | 67% | 2707 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 98% | 43,439 psi | 68% | 2720 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 94% | 34,113 psi | 53% | 2556 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 39,407 psi | 62% | 2605 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,910 psi | 83% | 2782 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,785 psi | 65% | 2680 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,167 psi | 75% | 2805 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,030 psi | 61% | 2598 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 86% | 39,523 psi | 62% | 2651 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,082 psi | 49% | 2448 fps | 98.9% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,951 psi | 49% | 2464 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,750 psi | 53% | 2575 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 54,215 psi | 85% | 2854 fps | 95.1% |
| Bofors RP15 | <<locked>> | 88% | 39,160 psi | 61% | 2641 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 53,621 psi | 84% | 2795 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 41,959 psi | 66% | 2733 fps | 95.8% |
| Bofors RP5 | <<locked>> | 86% | 39,523 psi | 62% | 2651 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 46,601 psi | 73% | 2680 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 94% | 41,785 psi | 65% | 2687 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 53,679 psi | 84% | 2815 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,281 psi | 71% | 2723 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 80% | 47,892 psi | 75% | 2740 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 88% | 45,556 psi | 71% | 2717 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 44,628 psi | 70% | 2697 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,436 psi | 62% | 2572 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 36,666 psi | 57% | 2661 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 44,643 psi | 70% | 2746 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,630 psi | 43% | 1598 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,206 psi | 66% | 2615 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,080 psi | 75% | 2710 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 41,597 psi | 65% | 2625 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 44,237 psi | 69% | 2654 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 90% | 43,526 psi | 68% | 2743 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 45,542 psi | 71% | 2657 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 43,830 psi | 69% | 2648 fps | 98.5% |
| Lovex S071 | <<locked>> | 84% | 31,821 psi | 50% | 2402 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 41,901 psi | 66% | 2644 fps | 96.2% |
| Norma 217 | <<locked>> | 98% | 34,505 psi | 54% | 2598 fps | 95% |
| Norma MRP | 67.6 gr | 80% | 33,794 psi | 53% | 2539 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 42,859 psi | 67% | 2664 fps | 99.7% |
| Ramshot Grand | <<locked>> | 90% | 43,497 psi | 68% | 2753 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 41,669 psi | 65% | 2654 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 88% | 36,114 psi | 57% | 2569 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,195 psi | 44% | 1637 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,403 psi | 84% | 2802 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,082 psi | 80% | 2848 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,424 psi | 68% | 2694 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,814 psi | 66% | 2710 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 36,027 psi | 56% | 2641 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 80% | 50,575 psi | 79% | 2746 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 43,120 psi | 68% | 2641 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 82% | 38,305 psi | 60% | 2582 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 46,601 psi | 73% | 2680 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,542 psi | 71% | 2657 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 43,830 psi | 69% | 2648 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,793 psi | 81% | 2799 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,923 psi | 80% | 2631 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,657 psi | 70% | 2608 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 37,956 psi | 59% | 2579 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 50,473 psi | 79% | 2743 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 46,934 psi | 74% | 2687 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 39,784 psi | 62% | 2625 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,274 psi | 57% | 2510 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 48,269 psi | 76% | 2667 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,266 psi | 69% | 2661 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 35,911 psi | 56% | 2497 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 43,627 psi | 68% | 2664 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 34,940 psi | 55% | 2526 fps | 98.8% |
| Vihtavuori N560 | 74.3 gr | 88% | 44,802 psi | 70% | 2776 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 94% | 44,498 psi | 70% | 2756 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,395 psi | 68% | 2628 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,440 psi | 71% | 2726 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,543 psi | 43% | 2444 fps | 98.7% |
| Winchester Supreme 780 | <<locked>> | 84% | 37,927 psi | 59% | 2546 fps | 95.1% |
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 79 powders for .300 Weath. Mag. loaded with the .308 | 185gr | Berger Classic Hybrid Hunter. Alliant Reloder-26 delivers the highest muzzle velocity at 3,018 fps; across all powders the maximum-charge window runs from 1,791 fps to 3,018 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 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 185.0 gr projectile in 0.308" calls for a 1:12.5 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. Norma MRP, Vihtavuori N560, Accurate MAGPRO rank at the top here: for .300 Weath. Mag. with the .308 | 185gr | Berger Classic Hybrid Hunter 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.