Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 180gr | Nosler CT FailSafe bullet and 81 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Vihtavuori N560.
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>> | 98% | 57,566 psi | 90% | 2920 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 57,740 psi | 90% | 2838 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,608 psi | 87% | 2910 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 55,898 psi | 88% | 3009 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 84% | 57,232 psi | 90% | 2874 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,304 psi | 88% | 2959 fps | 99% |
| ADI AR 2213 | <<locked>> | 98% | 57,595 psi | 90% | 3015 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,871 psi | 62% | 2730 fps | 97.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,911 psi | 86% | 2848 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,275 psi | 88% | 2963 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,522 psi | 90% | 2982 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,753 psi | 87% | 2946 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,116 psi | 90% | 3009 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,491 psi | 85% | 2933 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,357 psi | 79% | 2930 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,563 psi | 86% | 3018 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,028 psi | 88% | 2989 fps | 99% |
| Bofors RP3 | <<locked>> | 82% | 55,898 psi | 88% | 2864 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,195 psi | 72% | 2851 fps | 96.7% |
| Bofors RP5 | <<locked>> | 98% | 57,116 psi | 90% | 3009 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 54,955 psi | 86% | 2854 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,647 psi | 78% | 2874 fps | 97.6% |
| Hodgdon H380 | <<locked>> | 82% | 55,970 psi | 88% | 2884 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,363 psi | 90% | 2963 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 86% | 56,608 psi | 89% | 2920 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 96% | 57,740 psi | 90% | 2956 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,550 psi | 89% | 2940 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,652 psi | 89% | 2887 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,168 psi | 77% | 2979 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 86% | 53,925 psi | 85% | 2940 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,898 psi | 58% | 1811 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,579 psi | 89% | 2854 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,275 psi | 88% | 2894 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,318 psi | 88% | 2877 fps | 99.7% |
| IMR 4831 | <<locked>> | 90% | 55,825 psi | 87% | 2900 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,405 psi | 87% | 2884 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 98% | 55,158 psi | 86% | 2989 fps | 98% |
| Lovex S062 | <<locked>> | 82% | 57,087 psi | 89% | 2848 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,768 psi | 89% | 2877 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 54,926 psi | 86% | 2871 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,169 psi | 80% | 2825 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 57,667 psi | 90% | 2904 fps | 100% |
| Norma 204 | <<locked>> | 90% | 57,130 psi | 90% | 2946 fps | 98.9% |
| Norma MRP | <<locked>> | 96% | 57,014 psi | 89% | 3035 fps | 99.8% |
| Norma URP | <<locked>> | 90% | 57,667 psi | 90% | 2946 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,825 psi | 87% | 3009 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 56,362 psi | 88% | 2946 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,853 psi | 84% | 2943 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,623 psi | 59% | 1854 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,666 psi | 87% | 2867 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,942 psi | 89% | 2969 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,317 psi | 87% | 2930 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,624 psi | 90% | 3018 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,545 psi | 78% | 2976 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 55,970 psi | 88% | 2861 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,653 psi | 90% | 2927 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 94% | 55,071 psi | 86% | 2933 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 86% | 54,955 psi | 86% | 2854 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,768 psi | 89% | 2877 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,087 psi | 89% | 2848 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 54,926 psi | 86% | 2871 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,450 psi | 90% | 2920 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,304 psi | 88% | 2736 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,246 psi | 88% | 2831 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,665 psi | 86% | 2930 fps | 98.9% |
| Somchem S355 | <<locked>> | 84% | 55,782 psi | 87% | 2854 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,738 psi | 87% | 2864 fps | 97.3% |
| Somchem S365 | <<locked>> | 92% | 57,725 psi | 90% | 2946 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,724 psi | 87% | 2910 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 86% | 57,000 psi | 89% | 2828 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,985 psi | 88% | 2887 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,100 psi | 86% | 2884 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 57,711 psi | 90% | 2825 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 55,071 psi | 86% | 2890 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,971 psi | 89% | 2959 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 56,971 psi | 89% | 3025 fps | 97.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,707 psi | 83% | 2940 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,347 psi | 87% | 2844 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,595 psi | 90% | 2966 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,027 psi | 86% | 3064 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,593 psi | 87% | 2900 fps | 98.8% |
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% | 31,256 psi | 49% | 2415 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 54,157 psi | 85% | 2789 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 42,163 psi | 66% | 2680 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 92% | 48,573 psi | 76% | 2881 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 50,633 psi | 79% | 2772 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 40,451 psi | 63% | 2664 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 90% | 44,164 psi | 69% | 2769 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 96% | 35,143 psi | 55% | 2608 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,532 psi | 81% | 2795 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,640 psi | 64% | 2690 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,601 psi | 73% | 2812 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 40,408 psi | 63% | 2661 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 88% | 40,872 psi | 64% | 2710 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,052 psi | 47% | 2448 fps | 98.2% |
| Alliant Reloder-25 | <<locked>> | 86% | 32,010 psi | 50% | 2520 fps | 96% |
| Alliant Reloder-26 | 69.1 gr | 80% | 32,547 psi | 51% | 2572 fps | 97.1% |
| Bofors RP15 | <<locked>> | 90% | 40,480 psi | 63% | 2700 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 52,170 psi | 82% | 2808 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 43,192 psi | 68% | 2789 fps | 95.8% |
| Bofors RP5 | <<locked>> | 88% | 40,872 psi | 64% | 2710 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 45,614 psi | 71% | 2694 fps | 98% |
| Hodgdon H1000 | <<locked>> | 96% | 43,207 psi | 68% | 2743 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 52,286 psi | 82% | 2825 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 43,932 psi | 69% | 2726 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 80% | 46,630 psi | 73% | 2746 fps | 97.6% |
| Hodgdon H4831 | <<locked>> | 90% | 47,108 psi | 74% | 2776 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 46,325 psi | 73% | 2759 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,174 psi | 60% | 2575 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 37,927 psi | 59% | 2717 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 43,076 psi | 68% | 2746 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,485 psi | 43% | 1614 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,272 psi | 83% | 2805 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,060 psi | 64% | 2618 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,905 psi | 74% | 2717 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 40,321 psi | 63% | 2631 fps | 99.3% |
| IMR 4955 Enduron | <<locked>> | 88% | 45,890 psi | 72% | 2717 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 92% | 45,165 psi | 71% | 2802 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 53,577 psi | 84% | 2799 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,367 psi | 70% | 2667 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 42,641 psi | 67% | 2651 fps | 98% |
| Lovex S071 | <<locked>> | 86% | 32,735 psi | 51% | 2454 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 54,157 psi | 85% | 2851 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,712 psi | 64% | 2644 fps | 95.4% |
| Norma MRP | 68.7 gr | 82% | 34,911 psi | 55% | 2598 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 41,568 psi | 65% | 2671 fps | 99.4% |
| Ramshot Grand | <<locked>> | 92% | 44,962 psi | 70% | 2812 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 40,393 psi | 63% | 2661 fps | 98% |
| Ramshot Magnum | <<locked>> | 90% | 37,405 psi | 59% | 2625 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,195 psi | 44% | 1657 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,112 psi | 82% | 2808 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,472 psi | 78% | 2861 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,018 psi | 66% | 2700 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,408 psi | 63% | 2710 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 34,809 psi | 55% | 2631 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 49,153 psi | 77% | 2756 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 44,773 psi | 70% | 2700 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 84% | 39,494 psi | 62% | 2638 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 45,614 psi | 71% | 2694 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,367 psi | 70% | 2667 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 53,577 psi | 84% | 2799 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,641 psi | 67% | 2651 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,415 psi | 79% | 2812 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,661 psi | 78% | 2644 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,540 psi | 68% | 2615 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 39,146 psi | 61% | 2635 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 49,139 psi | 77% | 2753 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 45,774 psi | 72% | 2694 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 38,377 psi | 60% | 2631 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 37,681 psi | 59% | 2572 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 46,992 psi | 74% | 2680 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,975 psi | 67% | 2667 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 86% | 37,159 psi | 58% | 2552 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 54,056 psi | 85% | 2776 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,395 psi | 66% | 2671 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 33,678 psi | 53% | 2526 fps | 98.3% |
| Vihtavuori N560 | 75.4 gr | 90% | 46,383 psi | 73% | 2838 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 96% | 45,992 psi | 72% | 2818 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,974 psi | 66% | 2631 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,135 psi | 69% | 2730 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,600 psi | 42% | 2434 fps | 97.7% |
| Winchester Supreme 780 | <<locked>> | 86% | 39,349 psi | 62% | 2605 fps | 95.2% |
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 87 powders for .300 Weath. Mag. loaded with the .308 | 180gr | Nosler CT FailSafe. Winchester StaBALL HD delivers the highest muzzle velocity at 3,064 fps; across all powders the maximum-charge window runs from 1,811 fps to 3,064 fps. ADI AR 2217 gives the best case fill at 100 %, and 87 of the 87 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 1:12.5 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. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for .300 Weath. Mag. with the .308 | 180gr | Nosler CT 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 N568 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.