Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 180gr | Winchester FailSafe bullet and 78 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 ADI AR 2213.
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% | 54,375 psi | 85% | 2877 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 55,956 psi | 88% | 2917 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 56,608 psi | 89% | 3022 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 84% | 57,595 psi | 90% | 2881 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,637 psi | 89% | 2966 fps | 99% |
| ADI AR 2213 | <<locked>> | 96% | 54,346 psi | 85% | 2966 fps | 97.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,219 psi | 63% | 2740 fps | 97.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,303 psi | 87% | 2854 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,637 psi | 89% | 2969 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,215 psi | 85% | 2933 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,260 psi | 88% | 2956 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,638 psi | 90% | 3018 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,071 psi | 86% | 2940 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,836 psi | 80% | 2940 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,390 psi | 87% | 3031 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,536 psi | 89% | 2999 fps | 99.1% |
| Bofors RP3 | <<locked>> | 82% | 56,289 psi | 88% | 2871 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,688 psi | 73% | 2861 fps | 96.8% |
| Bofors RP5 | <<locked>> | 98% | 57,638 psi | 90% | 3018 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 55,303 psi | 87% | 2864 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,053 psi | 78% | 2884 fps | 97.8% |
| Hodgdon H380 | <<locked>> | 82% | 56,333 psi | 88% | 2890 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,143 psi | 85% | 2913 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 86% | 56,927 psi | 89% | 2927 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 94% | 54,520 psi | 85% | 2907 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 96% | 57,000 psi | 89% | 2946 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 57,043 psi | 89% | 2894 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,603 psi | 78% | 2989 fps | 99% |
| Hodgdon Superformance | <<locked>> | 86% | 54,244 psi | 85% | 2946 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,912 psi | 58% | 1814 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,942 psi | 89% | 2861 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,594 psi | 89% | 2900 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,695 psi | 89% | 2887 fps | 99.7% |
| IMR 4831 | <<locked>> | 90% | 56,173 psi | 88% | 2907 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,695 psi | 87% | 2890 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 98% | 55,666 psi | 87% | 2999 fps | 98.1% |
| Lovex S062 | <<locked>> | 82% | 57,261 psi | 90% | 2851 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,130 psi | 90% | 2884 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,259 psi | 87% | 2881 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,677 psi | 81% | 2835 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 57,667 psi | 90% | 2956 fps | 99% |
| Norma MRP | <<locked>> | 96% | 57,580 psi | 90% | 3045 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 54,418 psi | 85% | 2897 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,333 psi | 88% | 3022 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 90% | 56,913 psi | 89% | 2959 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,563 psi | 86% | 2956 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,652 psi | 59% | 1857 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,985 psi | 88% | 2874 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,595 psi | 90% | 2979 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,898 psi | 88% | 2940 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,056 psi | 85% | 2963 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,140 psi | 79% | 2989 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 56,362 psi | 88% | 2867 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,563 psi | 86% | 2881 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 94% | 55,651 psi | 87% | 2943 fps | 99% |
| Rottweil R 907 | <<locked>> | 86% | 55,303 psi | 87% | 2864 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,130 psi | 90% | 2884 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,261 psi | 90% | 2851 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,259 psi | 87% | 2881 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,288 psi | 85% | 2874 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,666 psi | 89% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,768 psi | 89% | 2841 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,187 psi | 86% | 2940 fps | 99% |
| Somchem S355 | <<locked>> | 84% | 56,173 psi | 88% | 2861 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,173 psi | 88% | 2874 fps | 97.4% |
| Somchem S365 | <<locked>> | 90% | 54,389 psi | 85% | 2904 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,202 psi | 88% | 2917 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 86% | 57,406 psi | 90% | 2835 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,362 psi | 88% | 2894 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,593 psi | 87% | 2894 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 88% | 55,405 psi | 87% | 2897 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 57,276 psi | 90% | 2966 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,479 psi | 90% | 3038 fps | 98% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,229 psi | 83% | 2949 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,869 psi | 88% | 2851 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,346 psi | 85% | 2917 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,637 psi | 87% | 3071 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,086 psi | 88% | 2910 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% | 31,546 psi | 49% | 2425 fps | 95.2% |
| Accurate 4350 | <<locked>> | 80% | 42,569 psi | 67% | 2690 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 92% | 49,037 psi | 77% | 2890 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 50,807 psi | 80% | 2779 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 40,799 psi | 64% | 2674 fps | 95.6% |
| ADI AR 2213 | 73.6 gr | 90% | 44,411 psi | 70% | 2776 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 96% | 35,447 psi | 56% | 2618 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,953 psi | 81% | 2802 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,843 psi | 64% | 2697 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,036 psi | 74% | 2822 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 40,712 psi | 64% | 2667 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 38,551 psi | 60% | 2661 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,342 psi | 48% | 2454 fps | 98.4% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,255 psi | 47% | 2467 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 32,822 psi | 51% | 2579 fps | 97.2% |
| Bofors RP15 | <<locked>> | 90% | 40,828 psi | 64% | 2710 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 52,591 psi | 82% | 2815 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 40,828 psi | 64% | 2743 fps | 95% |
| Bofors RP5 | <<locked>> | 86% | 38,551 psi | 60% | 2661 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 45,774 psi | 72% | 2697 fps | 98% |
| Hodgdon H1000 | <<locked>> | 94% | 40,814 psi | 64% | 2694 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 52,663 psi | 83% | 2835 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,295 psi | 69% | 2736 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 46,992 psi | 74% | 2753 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 90% | 47,587 psi | 75% | 2785 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 90% | 46,615 psi | 73% | 2769 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,551 psi | 60% | 2585 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 38,174 psi | 60% | 2726 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 43,555 psi | 68% | 2756 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,572 psi | 43% | 1621 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,476 psi | 84% | 2812 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,394 psi | 65% | 2628 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,065 psi | 74% | 2723 fps | 98.6% |
| IMR 4831 | <<locked>> | 80% | 40,654 psi | 64% | 2638 fps | 99.4% |
| IMR 4955 Enduron | <<locked>> | 88% | 46,195 psi | 72% | 2726 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 92% | 45,629 psi | 72% | 2815 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 53,998 psi | 85% | 2805 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,715 psi | 70% | 2674 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 43,004 psi | 67% | 2657 fps | 98.1% |
| Lovex S071 | <<locked>> | 84% | 31,038 psi | 49% | 2411 fps | 95% |
| Norma 204 | <<locked>> | 80% | 41,031 psi | 64% | 2654 fps | 95.6% |
| Norma MRP | 69.2 gr | 82% | 35,186 psi | 55% | 2605 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 41,945 psi | 66% | 2680 fps | 99.4% |
| Ramshot Grand | <<locked>> | 90% | 42,250 psi | 66% | 2756 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 40,712 psi | 64% | 2667 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 90% | 37,840 psi | 59% | 2635 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,108 psi | 44% | 1657 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,446 psi | 82% | 2818 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,893 psi | 78% | 2867 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,366 psi | 66% | 2707 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,698 psi | 64% | 2720 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 35,114 psi | 55% | 2641 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 49,530 psi | 78% | 2762 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 45,063 psi | 71% | 2710 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 84% | 39,813 psi | 62% | 2651 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 45,774 psi | 72% | 2697 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,715 psi | 70% | 2674 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 53,998 psi | 85% | 2805 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,004 psi | 67% | 2657 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,778 psi | 80% | 2818 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,038 psi | 78% | 2654 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,859 psi | 69% | 2621 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 39,465 psi | 62% | 2644 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 49,530 psi | 78% | 2759 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 46,021 psi | 72% | 2700 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 38,740 psi | 61% | 2638 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,476 psi | 56% | 2520 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 47,384 psi | 74% | 2687 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,352 psi | 68% | 2677 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 37,478 psi | 59% | 2562 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 42,743 psi | 67% | 2677 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 34,026 psi | 53% | 2536 fps | 98.4% |
| Vihtavuori N560 | 76 gr | 90% | 46,833 psi | 73% | 2848 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 96% | 46,456 psi | 73% | 2828 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,308 psi | 66% | 2641 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,483 psi | 70% | 2740 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,847 psi | 42% | 2444 fps | 97.9% |
| Winchester Supreme 780 | <<locked>> | 86% | 39,798 psi | 62% | 2618 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 85 powders for .300 Weath. Mag. loaded with the .308 | 180gr | Winchester FailSafe. Winchester StaBALL HD delivers the highest muzzle velocity at 3,071 fps; across all powders the maximum-charge window runs from 1,814 fps to 3,071 fps. ADI AR 2217 gives the best case fill at 100 %, and 85 of the 85 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 180.0 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. Norma MRP, Vihtavuori N560, ADI AR 2213 rank at the top here: for .300 Weath. Mag. with the .308 | 180gr | Winchester FailSafe they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, ReloadSwiss RS 80, 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.