Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 183gr | Peregrine Plainsmaster (VLR-4) bullet and 89 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 Alliant Reloder-26.
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% | 55,767 psi | 87% | 2808 fps | 99.3% |
| Accurate 3100 | <<locked>> | 98% | 54,679 psi | 86% | 2861 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 55,013 psi | 86% | 2782 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,478 psi | 89% | 2900 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 57,305 psi | 90% | 3012 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 84% | 55,405 psi | 87% | 2822 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,725 psi | 90% | 2956 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 98% | 55,317 psi | 87% | 2953 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,753 psi | 59% | 2661 fps | 96.6% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 54,259 psi | 85% | 2897 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,188 psi | 88% | 2841 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,289 psi | 88% | 2864 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,508 psi | 90% | 2959 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,100 psi | 86% | 2927 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,985 psi | 89% | 2943 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,621 psi | 86% | 2946 fps | 98.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,332 psi | 87% | 2923 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,834 psi | 75% | 2864 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,767 psi | 87% | 3015 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,563 psi | 84% | 2930 fps | 98.7% |
| Bofors RP3 | <<locked>> | 84% | 57,101 psi | 89% | 2858 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,555 psi | 68% | 2782 fps | 95.9% |
| Bofors RP5 | <<locked>> | 98% | 54,621 psi | 86% | 2946 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 56,260 psi | 88% | 2851 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,384 psi | 74% | 2808 fps | 97.1% |
| Hodgdon H380 | <<locked>> | 84% | 57,421 psi | 90% | 2881 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,071 psi | 86% | 2904 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 86% | 54,694 psi | 86% | 2864 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 96% | 55,390 psi | 87% | 2894 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,201 psi | 85% | 2877 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,288 psi | 85% | 2831 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,717 psi | 73% | 2907 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 88% | 55,332 psi | 87% | 2940 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,550 psi | 57% | 1781 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,563 psi | 86% | 2802 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,014 psi | 89% | 2841 fps | 99.7% |
| IMR 4350 | <<locked>> | 92% | 57,667 psi | 90% | 2890 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,491 psi | 85% | 2825 fps | 99.5% |
| IMR 4831 | <<locked>> | 92% | 56,927 psi | 89% | 2890 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,782 psi | 89% | 2884 fps | 97.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,695 psi | 89% | 2989 fps | 98.3% |
| Lovex S062 | <<locked>> | 82% | 54,911 psi | 86% | 2795 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,679 psi | 86% | 2825 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,159 psi | 88% | 2867 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,486 psi | 76% | 2762 fps | 99.5% |
| Norma 203B | <<locked>> | 82% | 55,579 psi | 87% | 2851 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,853 psi | 86% | 2887 fps | 98.6% |
| Norma MRP | <<locked>> | 96% | 54,404 psi | 85% | 2972 fps | 99.6% |
| Norma URP | <<locked>> | 90% | 55,274 psi | 87% | 2887 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,710 psi | 89% | 2877 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 57,261 psi | 90% | 3009 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 90% | 54,027 psi | 85% | 2890 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,140 psi | 80% | 2877 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,231 psi | 58% | 1821 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,232 psi | 90% | 2867 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,621 psi | 86% | 2917 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,681 psi | 89% | 2927 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,027 psi | 86% | 2956 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,847 psi | 73% | 2900 fps | 99.2% |
| Rottweil R 902 | <<locked>> | 82% | 56,623 psi | 89% | 2802 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,232 psi | 90% | 2858 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,448 psi | 87% | 2867 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 96% | 56,217 psi | 88% | 2927 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 88% | 56,260 psi | 88% | 2851 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,679 psi | 86% | 2825 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 54,911 psi | 86% | 2795 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,159 psi | 88% | 2867 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,317 psi | 87% | 2864 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,360 psi | 85% | 2690 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,070 psi | 85% | 2776 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,738 psi | 87% | 2923 fps | 99% |
| Somchem S355 | <<locked>> | 86% | 57,116 psi | 90% | 2851 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 57,174 psi | 90% | 2861 fps | 97.5% |
| Somchem S365 | <<locked>> | 92% | 54,998 psi | 86% | 2887 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,797 psi | 89% | 2900 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 82% | 57,188 psi | 90% | 2756 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,421 psi | 90% | 2776 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 54,839 psi | 86% | 2776 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,217 psi | 90% | 2881 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,260 psi | 88% | 2881 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 82% | 55,593 psi | 87% | 2772 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,405 psi | 88% | 2887 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,186 psi | 85% | 2900 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,534 psi | 85% | 2963 fps | 97.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,792 psi | 78% | 2871 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,130 psi | 90% | 2844 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,071 psi | 86% | 2904 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,692 psi | 81% | 2999 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 57,145 psi | 90% | 2900 fps | 99% |
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% | 52,257 psi | 82% | 2753 fps | 98.9% |
| Accurate 3100 | <<locked>> | 82% | 31,256 psi | 49% | 2405 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 51,619 psi | 81% | 2733 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,943 psi | 63% | 2618 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 94% | 49,632 psi | 78% | 2881 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 48,718 psi | 76% | 2717 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 41,350 psi | 65% | 2664 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 92% | 45,078 psi | 71% | 2766 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 98% | 35,462 psi | 56% | 2602 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 38,885 psi | 61% | 2605 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,385 psi | 77% | 2740 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,910 psi | 83% | 2812 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,682 psi | 61% | 2628 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,382 psi | 70% | 2753 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 41,046 psi | 64% | 2654 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 38,725 psi | 61% | 2644 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,297 psi | 44% | 2382 fps | 97.6% |
| Alliant Reloder-25 | <<locked>> | 86% | 30,226 psi | 47% | 2451 fps | 95% |
| Alliant Reloder-26 | 66.9 gr | 80% | 30,371 psi | 48% | 2493 fps | 96.1% |
| Bofors RP15 | <<locked>> | 92% | 40,973 psi | 64% | 2694 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 49,835 psi | 78% | 2753 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 40,770 psi | 64% | 2720 fps | 95% |
| Bofors RP5 | <<locked>> | 88% | 38,725 psi | 61% | 2644 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 43,598 psi | 68% | 2631 fps | 97.5% |
| Hodgdon H1000 | <<locked>> | 96% | 41,133 psi | 64% | 2677 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 50,212 psi | 79% | 2769 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 41,989 psi | 66% | 2667 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 80% | 44,788 psi | 70% | 2690 fps | 97.2% |
| Hodgdon H4831 | <<locked>> | 92% | 48,182 psi | 76% | 2776 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 47,340 psi | 74% | 2759 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,245 psi | 57% | 2520 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 94% | 38,421 psi | 60% | 2713 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 40,930 psi | 64% | 2680 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,354 psi | 43% | 1591 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,271 psi | 80% | 2749 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,606 psi | 84% | 2789 fps | 99.5% |
| IMR 4350 | <<locked>> | 80% | 39,276 psi | 62% | 2562 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,150 psi | 71% | 2661 fps | 98.2% |
| IMR 4831 | <<locked>> | 80% | 38,348 psi | 60% | 2572 fps | 99% |
| IMR 4955 Enduron | <<locked>> | 90% | 47,007 psi | 74% | 2717 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 94% | 46,122 psi | 72% | 2802 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 51,576 psi | 81% | 2746 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,525 psi | 67% | 2612 fps | 98.8% |
| Lovex S070 | <<locked>> | 80% | 40,799 psi | 64% | 2595 fps | 97.6% |
| Lovex S071 | <<locked>> | 88% | 32,706 psi | 51% | 2441 fps | 95.8% |
| Norma 203B | <<locked>> | 80% | 52,228 psi | 82% | 2799 fps | 100% |
| Norma 204 | <<locked>> | 82% | 41,698 psi | 65% | 2648 fps | 95.7% |
| Norma MRP | 68.2 gr | 84% | 35,302 psi | 55% | 2592 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 39,653 psi | 62% | 2612 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 80% | 52,852 psi | 83% | 2822 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 42,772 psi | 67% | 2746 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 38,508 psi | 60% | 2602 fps | 97.6% |
| Ramshot Magnum | <<locked>> | 92% | 37,985 psi | 60% | 2621 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,862 psi | 44% | 1631 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,227 psi | 79% | 2756 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,166 psi | 74% | 2802 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,769 psi | 62% | 2638 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,464 psi | 60% | 2648 fps | 98.6% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 35,056 psi | 55% | 2621 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 53,200 psi | 83% | 2756 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,007 psi | 74% | 2700 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 42,859 psi | 67% | 2644 fps | 95% |
| Rottweil R 905 | <<locked>> | 86% | 40,161 psi | 63% | 2635 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 43,598 psi | 68% | 2631 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,525 psi | 67% | 2612 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 51,576 psi | 81% | 2746 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,799 psi | 64% | 2595 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,428 psi | 76% | 2756 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,051 psi | 75% | 2598 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,611 psi | 65% | 2556 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 39,798 psi | 62% | 2631 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 47,152 psi | 74% | 2697 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 46,862 psi | 73% | 2694 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 36,172 psi | 57% | 2566 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,578 psi | 56% | 2507 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 53,867 psi | 84% | 2717 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,012 psi | 85% | 2730 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,107 psi | 71% | 2625 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,162 psi | 65% | 2612 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 37,652 psi | 59% | 2546 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 52,112 psi | 82% | 2723 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,422 psi | 63% | 2612 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 31,444 psi | 49% | 2454 fps | 97.6% |
| Vihtavuori N560 | 74.7 gr | 92% | 47,297 psi | 74% | 2835 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 98% | 46,427 psi | 73% | 2808 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,161 psi | 63% | 2579 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,163 psi | 66% | 2674 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,903 psi | 39% | 2356 fps | 96.6% |
| Winchester Supreme 780 | <<locked>> | 88% | 40,234 psi | 63% | 2608 fps | 95.5% |
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 89 powders for .300 Weath. Mag. loaded with the .308 | 183gr | Peregrine Plainsmaster (VLR-4). Alliant Reloder-26 delivers the highest muzzle velocity at 3,015 fps; across all powders the maximum-charge window runs from 1,781 fps to 3,015 fps. ADI AR 2225 gives the best case fill at 100 %, and 89 of the 89 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 183.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, 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, Alliant Reloder-26 rank at the top here: for .300 Weath. Mag. with the .308 | 183gr | Peregrine Plainsmaster (VLR-4) 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.