Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 180gr | Alaska Bullet Works Kodiak SP SPBC bullet and 79 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>> | 96% | 54,244 psi | 85% | 2874 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 55,825 psi | 87% | 2917 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 56,492 psi | 89% | 3022 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 84% | 57,464 psi | 90% | 2881 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,739 psi | 89% | 2969 fps | 99% |
| ADI AR 2213 | <<locked>> | 96% | 54,230 psi | 85% | 2963 fps | 97.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,306 psi | 63% | 2746 fps | 97.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,884 psi | 89% | 2963 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,216 psi | 87% | 2851 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,536 psi | 89% | 2969 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,070 psi | 85% | 2933 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,144 psi | 88% | 2953 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 96% | 53,925 psi | 85% | 2959 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,940 psi | 86% | 2940 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,720 psi | 79% | 2936 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,288 psi | 87% | 3028 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,420 psi | 88% | 2999 fps | 99.1% |
| Bofors RP3 | <<locked>> | 82% | 56,159 psi | 88% | 2867 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,572 psi | 73% | 2858 fps | 96.8% |
| Bofors RP5 | <<locked>> | 96% | 53,925 psi | 85% | 2959 fps | 98.8% |
| Bofors RP7 | <<locked>> | 86% | 55,172 psi | 86% | 2861 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,980 psi | 78% | 2881 fps | 97.7% |
| Hodgdon H380 | <<locked>> | 82% | 56,246 psi | 88% | 2887 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,012 psi | 85% | 2910 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 86% | 57,072 psi | 89% | 2927 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 94% | 54,404 psi | 85% | 2904 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,942 psi | 89% | 2946 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,898 psi | 89% | 2890 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,719 psi | 78% | 2989 fps | 99% |
| Hodgdon Superformance | <<locked>> | 86% | 54,346 psi | 85% | 2946 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,782 psi | 58% | 1811 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,855 psi | 89% | 2861 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,478 psi | 89% | 2897 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,782 psi | 89% | 2887 fps | 99.7% |
| IMR 4831 | <<locked>> | 90% | 56,333 psi | 88% | 2907 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,796 psi | 87% | 2894 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 98% | 55,550 psi | 87% | 2999 fps | 98.1% |
| Lovex S062 | <<locked>> | 82% | 57,377 psi | 90% | 2854 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,232 psi | 90% | 2887 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,129 psi | 86% | 2874 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,605 psi | 81% | 2835 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 57,566 psi | 90% | 2956 fps | 99% |
| Norma MRP | <<locked>> | 96% | 57,696 psi | 90% | 3045 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 54,288 psi | 85% | 2897 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,463 psi | 88% | 3022 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 90% | 56,811 psi | 89% | 2956 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,462 psi | 85% | 2953 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,695 psi | 59% | 1857 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,912 psi | 88% | 2871 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,479 psi | 90% | 2976 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,767 psi | 87% | 2936 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,157 psi | 85% | 2966 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,053 psi | 78% | 2989 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 56,246 psi | 88% | 2864 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,505 psi | 85% | 2881 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 94% | 55,521 psi | 87% | 2943 fps | 99% |
| Rottweil R 907 | <<locked>> | 86% | 55,172 psi | 86% | 2861 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,232 psi | 90% | 2887 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,377 psi | 90% | 2854 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,129 psi | 86% | 2874 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,172 psi | 85% | 2874 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,550 psi | 89% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,652 psi | 89% | 2838 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,071 psi | 86% | 2936 fps | 98.9% |
| Somchem S355 | <<locked>> | 84% | 56,086 psi | 88% | 2861 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,101 psi | 88% | 2871 fps | 97.4% |
| Somchem S365 | <<locked>> | 90% | 54,302 psi | 85% | 2900 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,130 psi | 88% | 2917 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 86% | 57,261 psi | 90% | 2831 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,260 psi | 88% | 2890 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,535 psi | 87% | 2894 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 88% | 55,535 psi | 87% | 2897 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 57,392 psi | 90% | 2969 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,595 psi | 90% | 3038 fps | 98% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,113 psi | 83% | 2946 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,753 psi | 87% | 2851 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,244 psi | 85% | 2913 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,767 psi | 87% | 3074 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,217 psi | 88% | 2913 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% | 31,604 psi | 50% | 2425 fps | 95.2% |
| Accurate 4350 | <<locked>> | 80% | 42,656 psi | 67% | 2690 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 92% | 48,950 psi | 77% | 2890 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 50,894 psi | 80% | 2779 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 40,683 psi | 64% | 2671 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 90% | 44,353 psi | 70% | 2772 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 96% | 35,404 psi | 55% | 2618 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 41,046 psi | 64% | 2674 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,793 psi | 81% | 2802 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,944 psi | 64% | 2697 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,905 psi | 74% | 2818 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 40,640 psi | 64% | 2664 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 38,624 psi | 61% | 2661 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,269 psi | 47% | 2454 fps | 98.3% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,197 psi | 47% | 2467 fps | 95% |
| Alliant Reloder-26 | 69.5 gr | 80% | 32,750 psi | 51% | 2575 fps | 97.2% |
| Bofors RP15 | <<locked>> | 90% | 40,712 psi | 64% | 2707 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 52,678 psi | 83% | 2818 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 43,555 psi | 68% | 2799 fps | 95.9% |
| Bofors RP5 | <<locked>> | 86% | 38,624 psi | 61% | 2661 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 45,847 psi | 72% | 2697 fps | 98% |
| Hodgdon H1000 | <<locked>> | 96% | 43,511 psi | 68% | 2753 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 52,779 psi | 83% | 2835 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,208 psi | 69% | 2736 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 47,050 psi | 74% | 2756 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 90% | 47,471 psi | 74% | 2782 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 90% | 46,499 psi | 73% | 2766 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,435 psi | 60% | 2582 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 38,247 psi | 60% | 2730 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 43,482 psi | 68% | 2753 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,601 psi | 43% | 1621 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,577 psi | 84% | 2812 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,278 psi | 65% | 2625 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,137 psi | 74% | 2723 fps | 98.6% |
| IMR 4831 | <<locked>> | 80% | 40,567 psi | 64% | 2635 fps | 99.3% |
| IMR 4955 Enduron | <<locked>> | 88% | 46,108 psi | 72% | 2723 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 92% | 45,527 psi | 71% | 2812 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 53,911 psi | 84% | 2805 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,614 psi | 70% | 2674 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 43,076 psi | 68% | 2661 fps | 98.1% |
| Lovex S071 | <<locked>> | 86% | 32,967 psi | 52% | 2461 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 41,089 psi | 64% | 2657 fps | 95.6% |
| Norma MRP | 69.2 gr | 82% | 35,244 psi | 55% | 2608 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 42,018 psi | 66% | 2680 fps | 99.4% |
| Ramshot Grand | <<locked>> | 90% | 42,337 psi | 66% | 2756 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 40,828 psi | 64% | 2671 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 90% | 37,739 psi | 59% | 2635 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,152 psi | 44% | 1657 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,533 psi | 82% | 2818 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,748 psi | 78% | 2864 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,293 psi | 66% | 2707 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,770 psi | 64% | 2720 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 35,070 psi | 55% | 2638 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 49,617 psi | 78% | 2766 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 44,976 psi | 70% | 2710 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 84% | 39,885 psi | 63% | 2651 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 45,847 psi | 72% | 2697 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,614 psi | 70% | 2674 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 53,911 psi | 84% | 2805 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,076 psi | 68% | 2661 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,865 psi | 80% | 2822 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,951 psi | 78% | 2651 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,758 psi | 69% | 2621 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 39,537 psi | 62% | 2644 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 49,414 psi | 77% | 2756 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 45,919 psi | 72% | 2697 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 38,653 psi | 61% | 2635 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,534 psi | 56% | 2520 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 47,456 psi | 74% | 2687 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,424 psi | 68% | 2677 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 37,376 psi | 59% | 2559 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 42,815 psi | 67% | 2680 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 33,939 psi | 53% | 2533 fps | 98.3% |
| Vihtavuori N560 | 75.9 gr | 90% | 46,775 psi | 73% | 2844 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 96% | 46,412 psi | 73% | 2825 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,366 psi | 66% | 2641 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,411 psi | 70% | 2736 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,905 psi | 42% | 2444 fps | 98% |
| Winchester Supreme 780 | <<locked>> | 86% | 39,711 psi | 62% | 2615 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 79 powders for .300 Weath. Mag. loaded with the .308 | 180gr | Alaska Bullet Works Kodiak SP SPBC. Winchester StaBALL HD delivers the highest muzzle velocity at 3,074 fps; across all powders the maximum-charge window runs from 1,811 fps to 3,074 fps. ADI AR 2225 gives the best case fill at 100 %, and 79 of the 79 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 180.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-25, Bofors RP15 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 | Alaska Bullet Works Kodiak SP SPBC 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.