Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 175gr | Atomic 29 HP bullet and 89 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.
A valid access license is required to use the Personalized Load Calculator.
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 2495 | <<locked>> | 82% | 57,232 psi | 90% | 2825 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 55,172 psi | 86% | 2858 fps | 99% |
| Accurate 3100 | <<locked>> | 98% | 53,853 psi | 84% | 2907 fps | 99.8% |
| Accurate 4064 | <<locked>> | 82% | 54,259 psi | 85% | 2835 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,695 psi | 87% | 2953 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 56,420 psi | 88% | 3054 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 84% | 54,665 psi | 86% | 2874 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,014 psi | 89% | 3009 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 98% | 54,505 psi | 85% | 2999 fps | 97.4% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 57,101 psi | 89% | 3002 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,622 psi | 87% | 2900 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,753 psi | 87% | 2920 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,797 psi | 89% | 3015 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 54,346 psi | 85% | 2979 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,318 psi | 88% | 2992 fps | 98.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,595 psi | 90% | 3054 fps | 99% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,476 psi | 85% | 2976 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,050 psi | 74% | 2907 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,839 psi | 86% | 3064 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,707 psi | 83% | 2972 fps | 98.2% |
| Bofors RP3 | <<locked>> | 84% | 56,391 psi | 88% | 2913 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,595 psi | 90% | 3054 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 55,579 psi | 87% | 2904 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,601 psi | 73% | 2844 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 84% | 56,695 psi | 89% | 2933 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 54,404 psi | 85% | 2953 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 88% | 57,537 psi | 90% | 2969 fps | 99% |
| Hodgdon H4831 | <<locked>> | 96% | 54,650 psi | 86% | 2943 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,305 psi | 90% | 2982 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,145 psi | 90% | 2936 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,122 psi | 72% | 2946 fps | 97.8% |
| Hodgdon Superformance | <<locked>> | 88% | 54,534 psi | 85% | 2989 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,550 psi | 57% | 1827 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,566 psi | 90% | 2907 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,478 psi | 89% | 2894 fps | 99.6% |
| IMR 4350 | <<locked>> | 92% | 56,985 psi | 89% | 2943 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,406 psi | 90% | 2933 fps | 99.6% |
| IMR 4831 | <<locked>> | 92% | 56,173 psi | 88% | 2946 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,188 psi | 90% | 2946 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,188 psi | 88% | 2933 fps | 97.2% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,738 psi | 87% | 3035 fps | 97.8% |
| Lovex S062 | <<locked>> | 84% | 57,638 psi | 90% | 2897 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,580 psi | 90% | 2930 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 55,317 psi | 87% | 2917 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,645 psi | 75% | 2805 fps | 99.2% |
| Norma 203B | <<locked>> | 82% | 55,042 psi | 86% | 2907 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,346 psi | 85% | 2940 fps | 98.3% |
| Norma MRP | <<locked>> | 98% | 57,566 psi | 90% | 3084 fps | 99.7% |
| Norma URP | <<locked>> | 90% | 54,389 psi | 85% | 2936 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,927 psi | 88% | 2933 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,405 psi | 88% | 3054 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 92% | 57,087 psi | 89% | 2999 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,488 psi | 79% | 2923 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,217 psi | 58% | 1870 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,521 psi | 89% | 2917 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 53,679 psi | 84% | 2969 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,738 psi | 87% | 2976 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,331 psi | 85% | 3009 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,238 psi | 72% | 2943 fps | 98.7% |
| Rottweil R 902 | <<locked>> | 82% | 55,941 psi | 88% | 2858 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,507 psi | 89% | 2910 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,752 psi | 86% | 2917 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 96% | 55,550 psi | 87% | 2979 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 88% | 55,579 psi | 87% | 2904 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,580 psi | 90% | 2930 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,638 psi | 90% | 2897 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,317 psi | 87% | 2917 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,549 psi | 85% | 2917 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,174 psi | 90% | 2789 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,174 psi | 90% | 2881 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,085 psi | 86% | 2972 fps | 98.7% |
| Somchem S355 | <<locked>> | 86% | 56,434 psi | 88% | 2907 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,608 psi | 89% | 2913 fps | 97.1% |
| Somchem S365 | <<locked>> | 92% | 54,157 psi | 85% | 2940 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,072 psi | 88% | 2953 fps | 99.3% |
| Vihtavuori N135 | <<locked>> | 82% | 56,579 psi | 89% | 2815 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,956 psi | 89% | 2835 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 54,186 psi | 85% | 2828 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,521 psi | 89% | 2933 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,666 psi | 87% | 2930 fps | 99% |
| Vihtavuori N540 | <<locked>> | 82% | 55,013 psi | 86% | 2828 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,709 psi | 87% | 2936 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,985 psi | 89% | 3002 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 57,667 psi | 90% | 3077 fps | 97.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,066 psi | 77% | 2910 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,405 psi | 88% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,404 psi | 85% | 2953 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,662 psi | 79% | 3048 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,507 psi | 89% | 2953 fps | 98.7% |
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 2495 | <<locked>> | 80% | 53,722 psi | 84% | 2779 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,474 psi | 81% | 2799 fps | 98.5% |
| Accurate 3100 | <<locked>> | 84% | 33,083 psi | 52% | 2500 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 50,981 psi | 80% | 2785 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,320 psi | 62% | 2661 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 94% | 48,747 psi | 76% | 2920 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 48,182 psi | 76% | 2769 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 40,785 psi | 64% | 2703 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 94% | 47,529 psi | 74% | 2871 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 40,872 psi | 64% | 2703 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,791 psi | 76% | 2792 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,214 psi | 82% | 2864 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,174 psi | 60% | 2674 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,714 psi | 69% | 2802 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 40,451 psi | 63% | 2697 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 90% | 40,915 psi | 64% | 2749 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,876 psi | 44% | 2415 fps | 96.9% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,662 psi | 50% | 2539 fps | 95.2% |
| Alliant Reloder-26 | 68.3 gr | 80% | 29,834 psi | 47% | 2526 fps | 95.2% |
| Bofors RP15 | <<locked>> | 92% | 40,321 psi | 63% | 2733 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 49,313 psi | 77% | 2805 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 40,915 psi | 64% | 2749 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 43,091 psi | 68% | 2677 fps | 97% |
| Hodgdon H1000 | <<locked>> | 98% | 43,482 psi | 68% | 2779 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 49,676 psi | 78% | 2822 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 41,307 psi | 65% | 2710 fps | 97.1% |
| Hodgdon H4350 | <<locked>> | 80% | 44,338 psi | 69% | 2736 fps | 96.6% |
| Hodgdon H4831 | <<locked>> | 92% | 47,645 psi | 75% | 2822 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 49,966 psi | 78% | 2861 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,723 psi | 56% | 2559 fps | 99.3% |
| Hodgdon Retumbo | <<locked>> | 96% | 40,350 psi | 63% | 2812 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 40,393 psi | 63% | 2723 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,209 psi | 43% | 1631 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,691 psi | 79% | 2805 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,997 psi | 83% | 2838 fps | 99.2% |
| IMR 4350 | <<locked>> | 80% | 38,740 psi | 61% | 2602 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,614 psi | 70% | 2710 fps | 97.8% |
| IMR 4831 | <<locked>> | 80% | 37,753 psi | 59% | 2615 fps | 98.6% |
| IMR 4895 | <<locked>> | 80% | 53,606 psi | 84% | 2894 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 49,400 psi | 77% | 2818 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 94% | 45,382 psi | 71% | 2841 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 50,792 psi | 80% | 2795 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,032 psi | 66% | 2654 fps | 98.4% |
| Lovex S070 | <<locked>> | 80% | 40,263 psi | 63% | 2638 fps | 97% |
| Lovex S071 | <<locked>> | 90% | 34,243 psi | 54% | 2530 fps | 95.9% |
| Norma 203B | <<locked>> | 80% | 51,590 psi | 81% | 2851 fps | 100% |
| Norma 204 | <<locked>> | 82% | 41,147 psi | 64% | 2690 fps | 95.1% |
| Norma MRP | 71.3 gr | 86% | 37,318 psi | 58% | 2694 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 39,073 psi | 61% | 2654 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 80% | 52,170 psi | 82% | 2874 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 45,281 psi | 71% | 2851 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 37,855 psi | 59% | 2641 fps | 97% |
| Ramshot Magnum | <<locked>> | 94% | 40,147 psi | 63% | 2720 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,702 psi | 43% | 1670 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,501 psi | 78% | 2802 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,499 psi | 73% | 2854 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,189 psi | 61% | 2677 fps | 98.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,884 psi | 59% | 2687 fps | 98.1% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 37,188 psi | 58% | 2726 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 52,634 psi | 82% | 2808 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,369 psi | 73% | 2749 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 45,063 psi | 71% | 2743 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 86% | 39,537 psi | 62% | 2677 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 43,091 psi | 68% | 2677 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,032 psi | 66% | 2654 fps | 98.4% |
| Shooters World Precision | <<locked>> | 80% | 50,792 psi | 80% | 2795 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,263 psi | 63% | 2638 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,659 psi | 75% | 2805 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,427 psi | 74% | 2651 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,075 psi | 64% | 2602 fps | 97.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 42,003 psi | 66% | 2733 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 46,572 psi | 73% | 2746 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 49,443 psi | 77% | 2792 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 35,534 psi | 56% | 2608 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 37,565 psi | 59% | 2605 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 53,098 psi | 83% | 2769 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,374 psi | 84% | 2785 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,527 psi | 70% | 2677 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,538 psi | 64% | 2657 fps | 99% |
| Vihtavuori N165 | <<locked>> | 90% | 39,610 psi | 62% | 2641 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 51,619 psi | 81% | 2779 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,958 psi | 63% | 2654 fps | 98.7% |
| Vihtavuori N555 | <<locked>> | 80% | 30,879 psi | 48% | 2493 fps | 96.9% |
| Vihtavuori N560 | 76.3 gr | 92% | 46,644 psi | 73% | 2877 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 98% | 45,803 psi | 72% | 2848 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,595 psi | 62% | 2621 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 41,495 psi | 65% | 2713 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,453 psi | 38% | 2379 fps | 95.3% |
| Winchester Supreme 780 | <<locked>> | 90% | 42,540 psi | 67% | 2707 fps | 95.8% |
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 | 175gr | Atomic 29 HP. Norma MRP delivers the highest muzzle velocity at 3,084 fps; across all powders the maximum-charge window runs from 1,827 fps to 3,084 fps. Alliant Reloder-22 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 175.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-22, 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. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for .300 Weath. Mag. with the .308 | 175gr | Atomic 29 HP 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.