Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 170gr | TWENTY-NINE Ball Tip bullet and 90 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 ReloadSwiss RS 70.
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 2700 | <<locked>> | 82% | 55,506 psi | 87% | 2900 fps | 98.9% |
| Accurate 3100 | <<locked>> | 98% | 54,592 psi | 86% | 2953 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 55,172 psi | 86% | 2884 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,449 psi | 88% | 3002 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 55,753 psi | 87% | 3097 fps | 97.7% |
| Accurate MAGPRO | <<locked>> | 98% | 56,724 psi | 89% | 3097 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 84% | 54,984 psi | 86% | 2917 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,334 psi | 90% | 3048 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 98% | 54,781 psi | 86% | 3038 fps | 97.2% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 57,464 psi | 90% | 3045 fps | 98.7% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 57,464 psi | 90% | 3045 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,028 psi | 88% | 2940 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,173 psi | 88% | 2963 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,927 psi | 89% | 3054 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 54,563 psi | 86% | 3018 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,681 psi | 89% | 3035 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,157 psi | 85% | 3035 fps | 98.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,810 psi | 86% | 3018 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,456 psi | 74% | 2949 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,172 psi | 86% | 3107 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,113 psi | 83% | 3015 fps | 98.1% |
| Bofors RP3 | <<locked>> | 84% | 56,956 psi | 89% | 2959 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 54,157 psi | 85% | 3035 fps | 98.4% |
| Bofors RP7 | <<locked>> | 88% | 56,188 psi | 88% | 2946 fps | 99.1% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,166 psi | 74% | 2887 fps | 96.2% |
| Hodgdon H380 | <<locked>> | 84% | 57,145 psi | 90% | 2976 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 54,694 psi | 86% | 2995 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 88% | 57,740 psi | 90% | 3009 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 96% | 54,955 psi | 86% | 2982 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,595 psi | 90% | 3025 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,392 psi | 90% | 2976 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,557 psi | 73% | 2989 fps | 97.6% |
| Hodgdon Superformance | <<locked>> | 88% | 54,853 psi | 86% | 3031 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,666 psi | 57% | 1857 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,331 psi | 85% | 2897 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,797 psi | 89% | 2933 fps | 99.5% |
| IMR 4350 | <<locked>> | 92% | 57,377 psi | 90% | 2982 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,609 psi | 90% | 2972 fps | 99.5% |
| IMR 4831 | <<locked>> | 92% | 56,753 psi | 89% | 2989 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,653 psi | 90% | 2992 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,536 psi | 89% | 2972 fps | 97% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,057 psi | 88% | 3074 fps | 97.5% |
| Lovex S062 | <<locked>> | 82% | 54,795 psi | 86% | 2894 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,433 psi | 85% | 2917 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 55,956 psi | 88% | 2959 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,457 psi | 76% | 2851 fps | 99.1% |
| Norma 203B | <<locked>> | 82% | 55,477 psi | 87% | 2949 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,520 psi | 85% | 2976 fps | 98.1% |
| Norma MRP | <<locked>> | 96% | 53,809 psi | 84% | 3061 fps | 99.3% |
| Norma URP | <<locked>> | 90% | 54,984 psi | 86% | 2982 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,231 psi | 88% | 2972 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,898 psi | 89% | 3097 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 57,479 psi | 90% | 3041 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,865 psi | 80% | 2963 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,347 psi | 59% | 1900 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,029 psi | 89% | 2963 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,172 psi | 85% | 3012 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,289 psi | 88% | 3022 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,694 psi | 86% | 3051 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,804 psi | 73% | 2986 fps | 98.6% |
| Rottweil R 902 | <<locked>> | 82% | 56,594 psi | 89% | 2904 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,087 psi | 89% | 2956 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,143 psi | 86% | 2956 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 96% | 55,970 psi | 88% | 3018 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 88% | 56,188 psi | 88% | 2946 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,433 psi | 85% | 2917 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 54,795 psi | 86% | 2894 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,956 psi | 88% | 2959 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,114 psi | 86% | 2963 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,537 psi | 90% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,551 psi | 90% | 2920 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,492 psi | 87% | 3015 fps | 98.5% |
| Somchem S355 | <<locked>> | 86% | 56,971 psi | 89% | 2953 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,971 psi | 89% | 2953 fps | 96.9% |
| Somchem S365 | <<locked>> | 92% | 54,665 psi | 86% | 2986 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,579 psi | 89% | 2995 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 82% | 57,101 psi | 89% | 2861 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,130 psi | 90% | 2874 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 54,592 psi | 86% | 2871 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,000 psi | 89% | 2976 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,956 psi | 88% | 2969 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 55,434 psi | 87% | 2871 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,985 psi | 88% | 2979 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 57,392 psi | 90% | 3048 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 53,954 psi | 85% | 3048 fps | 96.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,763 psi | 78% | 2956 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,710 psi | 89% | 2940 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,926 psi | 86% | 2999 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,908 psi | 80% | 3094 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,855 psi | 89% | 2992 fps | 98.5% |
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 2700 | <<locked>> | 80% | 51,924 psi | 81% | 2841 fps | 98.4% |
| Accurate 3100 | <<locked>> | 84% | 33,939 psi | 53% | 2549 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 51,967 psi | 81% | 2835 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,103 psi | 63% | 2710 fps | 98.8% |
| Accurate High Country | <<locked>> | 90% | 45,194 psi | 71% | 2900 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 96% | 52,823 psi | 83% | 3028 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 48,602 psi | 76% | 2812 fps | 100% |
| ADI AR 2209 | <<locked>> | 88% | 43,990 psi | 69% | 2805 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 94% | 47,993 psi | 75% | 2910 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 41,452 psi | 65% | 2749 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 41,452 psi | 65% | 2749 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,342 psi | 77% | 2835 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,707 psi | 83% | 2910 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,682 psi | 61% | 2717 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,164 psi | 69% | 2844 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 41,017 psi | 64% | 2740 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 90% | 41,510 psi | 65% | 2792 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,543 psi | 45% | 2464 fps | 96.9% |
| Alliant Reloder-25 | <<locked>> | 88% | 32,358 psi | 51% | 2585 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 30,647 psi | 48% | 2579 fps | 95.3% |
| Bofors RP15 | <<locked>> | 94% | 43,743 psi | 69% | 2838 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 50,024 psi | 78% | 2851 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 41,510 psi | 65% | 2792 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 43,685 psi | 68% | 2720 fps | 96.9% |
| Hodgdon H1000 | <<locked>> | 98% | 43,932 psi | 69% | 2818 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 50,227 psi | 79% | 2864 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 41,829 psi | 66% | 2753 fps | 97% |
| Hodgdon H4350 | <<locked>> | 80% | 44,759 psi | 70% | 2776 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 94% | 51,430 psi | 81% | 2923 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 94% | 50,343 psi | 79% | 2904 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,332 psi | 57% | 2605 fps | 99.3% |
| Hodgdon Retumbo | <<locked>> | 96% | 40,886 psi | 64% | 2854 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 40,814 psi | 64% | 2766 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,412 psi | 43% | 1660 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,140 psi | 80% | 2848 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,345 psi | 84% | 2881 fps | 99.1% |
| IMR 4350 | <<locked>> | 80% | 39,233 psi | 61% | 2644 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,049 psi | 71% | 2749 fps | 97.7% |
| IMR 4831 | <<locked>> | 80% | 38,261 psi | 60% | 2654 fps | 98.5% |
| IMR 4895 | <<locked>> | 80% | 54,099 psi | 85% | 2936 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 49,850 psi | 78% | 2858 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 96% | 48,994 psi | 77% | 2946 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 51,416 psi | 81% | 2841 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,656 psi | 67% | 2700 fps | 98.3% |
| Lovex S070 | <<locked>> | 80% | 40,901 psi | 64% | 2680 fps | 96.9% |
| Lovex S071 | <<locked>> | 88% | 32,924 psi | 52% | 2523 fps | 95% |
| Norma 203B | <<locked>> | 80% | 52,069 psi | 82% | 2897 fps | 100% |
| Norma 204 | <<locked>> | 84% | 44,570 psi | 70% | 2795 fps | 95.9% |
| Norma MRP | 71.9 gr | 86% | 37,971 psi | 60% | 2740 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 39,668 psi | 62% | 2700 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 80% | 52,518 psi | 82% | 2917 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 45,788 psi | 72% | 2894 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 38,377 psi | 60% | 2684 fps | 96.9% |
| Ramshot Magnum | <<locked>> | 94% | 40,698 psi | 64% | 2762 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,934 psi | 44% | 1699 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,951 psi | 78% | 2844 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,862 psi | 73% | 2897 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,769 psi | 62% | 2723 fps | 98.5% |
| ReloadSwiss RS 70 | 68.2 gr | 80% | 38,363 psi | 60% | 2730 fps | 98% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 37,782 psi | 59% | 2769 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 53,287 psi | 84% | 2854 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,094 psi | 74% | 2799 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 45,585 psi | 71% | 2785 fps | 95% |
| Rottweil R 905 | <<locked>> | 88% | 42,830 psi | 67% | 2779 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 43,685 psi | 68% | 2720 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,656 psi | 67% | 2700 fps | 98.3% |
| Shooters World Precision | <<locked>> | 80% | 51,416 psi | 81% | 2841 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,901 psi | 64% | 2680 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,109 psi | 75% | 2848 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,921 psi | 75% | 2694 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,713 psi | 65% | 2641 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 42,438 psi | 67% | 2772 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 47,210 psi | 74% | 2792 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 49,893 psi | 78% | 2831 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 36,158 psi | 57% | 2654 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 38,189 psi | 60% | 2648 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 53,722 psi | 84% | 2815 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,824 psi | 84% | 2828 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,121 psi | 71% | 2720 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,075 psi | 64% | 2700 fps | 98.9% |
| Vihtavuori N165 | <<locked>> | 90% | 40,234 psi | 63% | 2684 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 52,098 psi | 82% | 2822 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,538 psi | 64% | 2700 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 31,691 psi | 50% | 2539 fps | 97% |
| Vihtavuori N560 | 78.5 gr | 94% | 50,314 psi | 79% | 2982 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 98% | 46,354 psi | 73% | 2894 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,030 psi | 63% | 2664 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 41,959 psi | 66% | 2756 fps | 97% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,193 psi | 39% | 2428 fps | 95.6% |
| Winchester Supreme 780 | <<locked>> | 90% | 42,902 psi | 67% | 2746 fps | 95.6% |
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 90 powders for .300 Weath. Mag. loaded with the .308 | 170gr | TWENTY-NINE Ball Tip. Alliant Reloder-26 delivers the highest muzzle velocity at 3,107 fps; across all powders the maximum-charge window runs from 1,857 fps to 3,107 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 90 of the 90 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 170.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, 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. Norma MRP, Vihtavuori N560, ReloadSwiss RS 70 rank at the top here: for .300 Weath. Mag. with the .308 | 170gr | TWENTY-NINE Ball Tip 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.