Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 185gr | Lapua Scenar bullet and 77 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N560, Norma MRP 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.
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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 3100 | <<locked>> | 96% | 55,985 psi | 88% | 2867 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 57,638 psi | 90% | 2907 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 54,447 psi | 85% | 2956 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 82% | 55,187 psi | 86% | 2812 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 54,505 psi | 85% | 2900 fps | 99% |
| ADI AR 2213 | <<locked>> | 96% | 55,869 psi | 88% | 2959 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,847 psi | 73% | 2792 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,597 psi | 65% | 2749 fps | 98.4% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,766 psi | 86% | 2897 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,521 psi | 89% | 2835 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,636 psi | 86% | 2907 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,898 psi | 88% | 2923 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 54,085 psi | 85% | 2887 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,666 psi | 87% | 2956 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,797 psi | 89% | 2930 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,402 psi | 82% | 2933 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 57,377 psi | 90% | 3022 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 54,824 psi | 86% | 2943 fps | 99.1% |
| Bofors RP3 | <<locked>> | 82% | 57,580 psi | 90% | 2854 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,298 psi | 76% | 2861 fps | 97.6% |
| Bofors RP5 | <<locked>> | 96% | 55,666 psi | 87% | 2956 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 56,652 psi | 89% | 2854 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,459 psi | 81% | 2881 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 86% | 55,637 psi | 87% | 2904 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 54,882 psi | 86% | 2861 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 94% | 55,999 psi | 88% | 2900 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,853 psi | 86% | 2881 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,955 psi | 86% | 2831 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,387 psi | 81% | 2992 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 86% | 56,072 psi | 88% | 2943 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,941 psi | 58% | 1795 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 54,505 psi | 85% | 2835 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,549 psi | 85% | 2822 fps | 99.7% |
| IMR 4831 | <<locked>> | 90% | 57,740 psi | 90% | 2894 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 57,029 psi | 89% | 2884 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 98% | 57,537 psi | 90% | 2999 fps | 98.7% |
| Lovex S065 | <<locked>> | 86% | 55,042 psi | 86% | 2822 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,652 psi | 89% | 2867 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,301 psi | 84% | 2828 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 55,303 psi | 87% | 2887 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 37,086 psi | 58% | 2667 fps | 96.3% |
| Norma MRP | <<locked>> | 94% | 55,550 psi | 87% | 2979 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 55,898 psi | 88% | 2887 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,215 psi | 85% | 2956 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 88% | 54,737 psi | 86% | 2890 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,608 psi | 89% | 2953 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,681 psi | 59% | 1834 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,363 psi | 90% | 2864 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 55,347 psi | 87% | 2910 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,551 psi | 90% | 2930 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,912 psi | 88% | 2959 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,750 psi | 81% | 2989 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 82% | 54,331 psi | 85% | 2802 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,970 psi | 88% | 2874 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 94% | 57,232 psi | 90% | 2936 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 86% | 56,652 psi | 89% | 2854 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,042 psi | 86% | 2822 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,652 psi | 89% | 2867 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,709 psi | 87% | 2861 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,740 psi | 90% | 2723 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,389 psi | 85% | 2776 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,782 psi | 89% | 2930 fps | 99.3% |
| Somchem S355 | <<locked>> | 84% | 57,406 psi | 90% | 2844 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,566 psi | 90% | 2864 fps | 98% |
| Somchem S365 | <<locked>> | 90% | 56,101 psi | 88% | 2890 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,230 psi | 85% | 2854 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 84% | 55,245 psi | 87% | 2769 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,317 psi | 85% | 2828 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 57,174 psi | 90% | 2887 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 88% | 56,855 psi | 89% | 2884 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,622 psi | 87% | 2907 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 55,492 psi | 87% | 2972 fps | 98% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 55,129 psi | 86% | 2949 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 57,348 psi | 90% | 2838 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,854 psi | 88% | 2907 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 53,896 psi | 84% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 53,969 psi | 85% | 2848 fps | 98.9% |
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% | 32,648 psi | 51% | 2425 fps | 96.1% |
| Accurate 4350 | <<locked>> | 80% | 43,932 psi | 69% | 2684 fps | 99.8% |
| Accurate MAGPRO | 77.8 gr | 90% | 47,239 psi | 74% | 2828 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 52,054 psi | 82% | 2766 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 39,160 psi | 61% | 2608 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 88% | 42,801 psi | 67% | 2713 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 98% | 43,874 psi | 69% | 2733 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 94% | 34,330 psi | 54% | 2566 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 39,552 psi | 62% | 2612 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,113 psi | 83% | 2789 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,134 psi | 66% | 2690 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,544 psi | 76% | 2812 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,175 psi | 61% | 2605 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 84% | 37,289 psi | 58% | 2602 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,357 psi | 49% | 2454 fps | 98.9% |
| Alliant Reloder-25 | <<locked>> | 82% | 29,182 psi | 46% | 2408 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 80% | 34,040 psi | 53% | 2582 fps | 98% |
| Bofors RP15 | <<locked>> | 88% | 39,436 psi | 62% | 2651 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 54,027 psi | 85% | 2805 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 39,537 psi | 62% | 2684 fps | 95% |
| Bofors RP5 | <<locked>> | 84% | 37,289 psi | 58% | 2602 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 46,934 psi | 74% | 2690 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 94% | 42,032 psi | 66% | 2697 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 45,614 psi | 71% | 2730 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 80% | 48,254 psi | 76% | 2749 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 88% | 45,672 psi | 72% | 2723 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 44,904 psi | 70% | 2707 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,784 psi | 62% | 2579 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 36,941 psi | 58% | 2667 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 44,744 psi | 70% | 2746 fps | 98.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,630 psi | 43% | 1601 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,337 psi | 66% | 2618 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,254 psi | 76% | 2713 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 41,930 psi | 66% | 2631 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 44,556 psi | 70% | 2664 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 90% | 43,816 psi | 69% | 2749 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 45,905 psi | 72% | 2667 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 44,164 psi | 69% | 2654 fps | 98.6% |
| Lovex S071 | <<locked>> | 84% | 31,981 psi | 50% | 2408 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 42,221 psi | 66% | 2651 fps | 96.3% |
| Norma 217 | <<locked>> | 98% | 34,737 psi | 54% | 2605 fps | 95.2% |
| Norma MRP | 67.9 gr | 80% | 33,910 psi | 53% | 2546 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 43,207 psi | 68% | 2674 fps | 99.7% |
| Ramshot Grand | <<locked>> | 88% | 40,770 psi | 64% | 2697 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 41,959 psi | 66% | 2664 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 88% | 36,347 psi | 57% | 2572 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,340 psi | 44% | 1644 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,766 psi | 84% | 2808 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,517 psi | 81% | 2858 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,743 psi | 69% | 2703 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,959 psi | 66% | 2713 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 33,750 psi | 53% | 2579 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 50,952 psi | 80% | 2753 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 43,395 psi | 68% | 2648 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 82% | 38,450 psi | 60% | 2589 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 46,934 psi | 74% | 2690 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,905 psi | 72% | 2667 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 44,164 psi | 69% | 2654 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,156 psi | 82% | 2805 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,068 psi | 80% | 2635 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,773 psi | 70% | 2612 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 38,116 psi | 60% | 2585 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 50,850 psi | 80% | 2749 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 44,251 psi | 69% | 2638 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 39,958 psi | 63% | 2628 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,564 psi | 57% | 2516 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 48,646 psi | 76% | 2674 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,614 psi | 70% | 2667 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 36,056 psi | 56% | 2500 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 43,990 psi | 69% | 2671 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 35,114 psi | 55% | 2530 fps | 98.9% |
| Vihtavuori N560 | 74.7 gr | 88% | 45,107 psi | 71% | 2785 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 94% | 44,788 psi | 70% | 2766 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,497 psi | 68% | 2631 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,614 psi | 71% | 2730 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,775 psi | 44% | 2454 fps | 98.8% |
| Winchester Supreme 780 | <<locked>> | 84% | 38,232 psi | 60% | 2556 fps | 95.3% |
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 77 powders for .300 Weath. Mag. loaded with the .308 | 185gr | Lapua Scenar. Alliant Reloder-26 delivers the highest muzzle velocity at 3,022 fps; across all powders the maximum-charge window runs from 1,795 fps to 3,022 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 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. Vihtavuori N560, Norma MRP, Accurate MAGPRO rank at the top here: for .300 Weath. Mag. with the .308 | 185gr | Lapua Scenar 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.