Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 186gr | Peregrine Backup (VRG-2) bullet and 80 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.
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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% | 55,013 psi | 86% | 2854 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 56,521 psi | 89% | 2887 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 57,638 psi | 90% | 3005 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 82% | 54,810 psi | 86% | 2805 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,682 psi | 90% | 2949 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 96% | 55,274 psi | 87% | 2949 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,180 psi | 72% | 2779 fps | 96.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,814 psi | 64% | 2730 fps | 98.3% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,201 psi | 85% | 2887 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,201 psi | 85% | 2887 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,738 psi | 87% | 2825 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,172 psi | 85% | 2897 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,100 psi | 86% | 2907 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,000 psi | 89% | 2933 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,955 psi | 86% | 2943 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,115 psi | 88% | 2917 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,706 psi | 81% | 2920 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,565 psi | 89% | 3005 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 57,566 psi | 90% | 2910 fps | 96% |
| Bofors RP15 | <<locked>> | 98% | 53,911 psi | 84% | 2923 fps | 99% |
| Bofors RP3 | <<locked>> | 82% | 56,811 psi | 89% | 2841 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,674 psi | 75% | 2848 fps | 97.5% |
| Bofors RP5 | <<locked>> | 96% | 54,955 psi | 86% | 2943 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 55,854 psi | 88% | 2841 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,024 psi | 80% | 2871 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 82% | 56,927 psi | 89% | 2861 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,839 psi | 86% | 2887 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 54,186 psi | 85% | 2848 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 94% | 55,434 psi | 87% | 2890 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,302 psi | 85% | 2871 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,346 psi | 85% | 2818 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,647 psi | 79% | 2976 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 86% | 55,448 psi | 87% | 2930 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,738 psi | 58% | 1788 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,711 psi | 90% | 2838 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,493 psi | 90% | 2881 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,580 psi | 90% | 2867 fps | 99.9% |
| IMR 4831 | <<locked>> | 90% | 57,058 psi | 89% | 2884 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,507 psi | 89% | 2874 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 98% | 56,956 psi | 89% | 2986 fps | 98.7% |
| Lovex S065 | <<locked>> | 86% | 54,418 psi | 85% | 2808 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,970 psi | 88% | 2858 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,286 psi | 82% | 2812 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 54,795 psi | 86% | 2881 fps | 99% |
| Norma MRP | <<locked>> | 94% | 54,853 psi | 86% | 2966 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 55,332 psi | 87% | 2877 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,711 psi | 90% | 3009 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 88% | 54,114 psi | 85% | 2881 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,854 psi | 88% | 2940 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,608 psi | 59% | 1834 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,594 psi | 89% | 2851 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,607 psi | 86% | 2897 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,797 psi | 89% | 2917 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,100 psi | 86% | 2943 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,126 psi | 80% | 2976 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 84% | 56,884 psi | 89% | 2838 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,463 psi | 87% | 2861 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 94% | 56,608 psi | 89% | 2923 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 86% | 55,854 psi | 88% | 2841 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,418 psi | 85% | 2808 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,970 psi | 88% | 2858 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,969 psi | 86% | 2848 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,130 psi | 90% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,305 psi | 90% | 2815 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,159 psi | 88% | 2920 fps | 99.3% |
| Somchem S355 | <<locked>> | 84% | 56,768 psi | 89% | 2835 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,942 psi | 89% | 2854 fps | 98% |
| Somchem S365 | <<locked>> | 90% | 55,405 psi | 87% | 2877 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,014 psi | 89% | 2897 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 84% | 54,404 psi | 85% | 2759 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,087 psi | 89% | 2867 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,492 psi | 89% | 2874 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 88% | 56,217 psi | 88% | 2871 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,520 psi | 85% | 2890 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,839 psi | 86% | 2959 fps | 97.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,259 psi | 85% | 2933 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,811 psi | 89% | 2828 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,071 psi | 86% | 2890 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 57,392 psi | 90% | 3051 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,246 psi | 90% | 2894 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% | 31,517 psi | 49% | 2398 fps | 95.7% |
| Accurate 4350 | <<locked>> | 80% | 42,873 psi | 67% | 2664 fps | 99.8% |
| Accurate MAGPRO | 78.2 gr | 90% | 46,470 psi | 73% | 2812 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 51,445 psi | 81% | 2753 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 38,595 psi | 60% | 2595 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 88% | 42,018 psi | 66% | 2697 fps | 95% |
| ADI AR 2217 | <<locked>> | 98% | 43,018 psi | 67% | 2713 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 94% | 33,562 psi | 53% | 2543 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 38,798 psi | 61% | 2592 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 38,798 psi | 61% | 2592 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,315 psi | 82% | 2776 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,423 psi | 65% | 2674 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,776 psi | 75% | 2795 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 38,406 psi | 60% | 2585 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 86% | 39,117 psi | 61% | 2641 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,487 psi | 48% | 2431 fps | 98.7% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,356 psi | 48% | 2448 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,025 psi | 52% | 2556 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 53,911 psi | 84% | 2851 fps | 95.1% |
| Bofors RP15 | <<locked>> | 88% | 38,769 psi | 61% | 2635 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 53,026 psi | 83% | 2785 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 41,408 psi | 65% | 2723 fps | 95.7% |
| Bofors RP5 | <<locked>> | 86% | 39,117 psi | 61% | 2641 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 46,151 psi | 72% | 2674 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 94% | 41,321 psi | 65% | 2680 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 53,200 psi | 83% | 2808 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,846 psi | 70% | 2717 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 80% | 47,572 psi | 75% | 2736 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 88% | 45,063 psi | 71% | 2710 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 44,150 psi | 69% | 2690 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,972 psi | 61% | 2562 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 36,187 psi | 57% | 2648 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 44,135 psi | 69% | 2733 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,456 psi | 43% | 1598 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 54,143 psi | 85% | 2785 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,640 psi | 65% | 2602 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,616 psi | 75% | 2703 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 41,031 psi | 64% | 2615 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 43,830 psi | 69% | 2648 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 90% | 43,192 psi | 68% | 2733 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 45,049 psi | 71% | 2651 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 43,308 psi | 68% | 2638 fps | 98.5% |
| Lovex S071 | <<locked>> | 84% | 30,864 psi | 48% | 2379 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 41,452 psi | 65% | 2635 fps | 96.2% |
| Norma MRP | 70 gr | 82% | 35,650 psi | 56% | 2589 fps | 96% |
| Norma URP | <<locked>> | 80% | 42,409 psi | 66% | 2657 fps | 99.7% |
| Ramshot Grand | <<locked>> | 90% | 42,902 psi | 67% | 2743 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 41,191 psi | 65% | 2644 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 88% | 35,418 psi | 56% | 2552 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,137 psi | 44% | 1637 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,997 psi | 83% | 2795 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,763 psi | 80% | 2841 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,815 psi | 67% | 2684 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,336 psi | 65% | 2700 fps | 99.4% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 35,418 psi | 56% | 2628 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 80% | 49,966 psi | 78% | 2736 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 42,699 psi | 67% | 2635 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 82% | 37,594 psi | 59% | 2569 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 46,151 psi | 72% | 2674 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,049 psi | 71% | 2651 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 43,308 psi | 68% | 2638 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,401 psi | 81% | 2792 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,444 psi | 79% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,947 psi | 69% | 2595 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 37,260 psi | 58% | 2562 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 49,995 psi | 78% | 2733 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 46,572 psi | 73% | 2680 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 39,059 psi | 61% | 2612 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,650 psi | 56% | 2497 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 47,848 psi | 75% | 2661 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,816 psi | 69% | 2654 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 35,346 psi | 55% | 2484 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 43,105 psi | 68% | 2654 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 34,069 psi | 53% | 2507 fps | 98.7% |
| Vihtavuori N560 | 75.1 gr | 88% | 44,425 psi | 70% | 2769 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 94% | 43,918 psi | 69% | 2746 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,946 psi | 67% | 2618 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,991 psi | 71% | 2720 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,847 psi | 42% | 2421 fps | 98.5% |
| Winchester Supreme 780 | <<locked>> | 84% | 37,391 psi | 59% | 2536 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 80 powders for .300 Weath. Mag. loaded with the .308 | 186gr | Peregrine Backup (VRG-2). Winchester StaBALL HD delivers the highest muzzle velocity at 3,051 fps; across all powders the maximum-charge window runs from 1,788 fps to 3,051 fps. ADI AR 2217 gives the best case fill at 100 %, and 80 of the 80 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 186.0 gr projectile in 0.308" calls for a 1:13.5 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 | 186gr | Peregrine Backup (VRG-2) 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.