Load Specifications
Load data in caliber .300 Weath. Mag. with .309 | 170gr | Reichenberg HDB Universal bullet and 88 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.
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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 2495 | <<locked>> | 82% | 57,566 psi | 90% | 2874 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 55,230 psi | 87% | 2904 fps | 98.9% |
| Accurate 3100 | <<locked>> | 98% | 54,172 psi | 85% | 2956 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 54,563 psi | 86% | 2884 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,130 psi | 88% | 3002 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 56,739 psi | 89% | 3104 fps | 96.7% |
| ADI AR 2208 | <<locked>> | 84% | 54,911 psi | 86% | 2923 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,174 psi | 90% | 3054 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 98% | 54,984 psi | 86% | 3051 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,811 psi | 87% | 2946 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,767 psi | 87% | 2966 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,956 psi | 89% | 3061 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 54,491 psi | 85% | 3025 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,666 psi | 89% | 3041 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,259 psi | 85% | 3045 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,795 psi | 86% | 3022 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,442 psi | 74% | 2956 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,201 psi | 87% | 3114 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,997 psi | 83% | 3022 fps | 98.2% |
| Bofors RP3 | <<locked>> | 84% | 56,536 psi | 89% | 2963 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 54,259 psi | 85% | 3045 fps | 98.5% |
| Bofors RP7 | <<locked>> | 88% | 55,854 psi | 88% | 2953 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,920 psi | 74% | 2890 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 84% | 56,985 psi | 89% | 2982 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 54,534 psi | 85% | 3002 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 88% | 57,711 psi | 90% | 3018 fps | 99% |
| Hodgdon H4831 | <<locked>> | 96% | 54,940 psi | 86% | 2989 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 53,795 psi | 84% | 2972 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,261 psi | 90% | 2982 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,470 psi | 73% | 2995 fps | 97.7% |
| Hodgdon Superformance | <<locked>> | 88% | 54,853 psi | 86% | 3038 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,564 psi | 57% | 1864 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,259 psi | 85% | 2904 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,666 psi | 89% | 2943 fps | 99.5% |
| IMR 4350 | <<locked>> | 92% | 57,232 psi | 90% | 2989 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,653 psi | 90% | 2982 fps | 99.6% |
| IMR 4831 | <<locked>> | 92% | 56,463 psi | 88% | 2995 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,217 psi | 90% | 2995 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,304 psi | 88% | 2976 fps | 97.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,188 psi | 88% | 3084 fps | 97.7% |
| Lovex S062 | <<locked>> | 82% | 54,317 psi | 85% | 2897 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,273 psi | 85% | 2923 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 55,695 psi | 87% | 2966 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,037 psi | 75% | 2854 fps | 99.1% |
| Norma 203B | <<locked>> | 82% | 55,071 psi | 86% | 2949 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,578 psi | 86% | 2986 fps | 98.2% |
| Norma MRP | <<locked>> | 96% | 53,911 psi | 84% | 3068 fps | 99.3% |
| Norma URP | <<locked>> | 90% | 54,824 psi | 86% | 2989 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,188 psi | 88% | 2982 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,956 psi | 89% | 3107 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 92% | 57,276 psi | 90% | 3045 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,734 psi | 80% | 2969 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,202 psi | 58% | 1906 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,739 psi | 89% | 2966 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 53,925 psi | 85% | 3015 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,202 psi | 88% | 3028 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,476 psi | 85% | 3054 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,557 psi | 73% | 2989 fps | 98.7% |
| Rottweil R 902 | <<locked>> | 82% | 56,086 psi | 88% | 2907 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,623 psi | 89% | 2956 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,998 psi | 86% | 2966 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 96% | 55,956 psi | 88% | 3028 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 88% | 55,854 psi | 88% | 2953 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,273 psi | 85% | 2923 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 54,317 psi | 85% | 2897 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,695 psi | 87% | 2966 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,839 psi | 86% | 2966 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,450 psi | 90% | 2838 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,319 psi | 90% | 2927 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,492 psi | 87% | 3022 fps | 98.6% |
| Somchem S355 | <<locked>> | 86% | 56,608 psi | 89% | 2953 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,797 psi | 89% | 2956 fps | 97% |
| Somchem S365 | <<locked>> | 92% | 54,491 psi | 85% | 2989 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,405 psi | 88% | 2999 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 82% | 56,739 psi | 89% | 2864 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,971 psi | 89% | 2881 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 54,288 psi | 85% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,898 psi | 89% | 2986 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,811 psi | 87% | 2976 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 55,187 psi | 86% | 2877 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,956 psi | 88% | 2986 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 57,174 psi | 90% | 3051 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,070 psi | 85% | 3058 fps | 96.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,385 psi | 77% | 2959 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,507 psi | 89% | 2946 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,752 psi | 86% | 3005 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,126 psi | 80% | 3097 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,710 psi | 89% | 2999 fps | 98.6% |
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% | 53,911 psi | 84% | 2825 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,663 psi | 81% | 2848 fps | 98.5% |
| Accurate 3100 | <<locked>> | 84% | 33,185 psi | 52% | 2536 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 51,140 psi | 80% | 2835 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,392 psi | 62% | 2703 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 96% | 52,823 psi | 83% | 3038 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 48,341 psi | 76% | 2815 fps | 100% |
| ADI AR 2209 | <<locked>> | 88% | 43,656 psi | 68% | 2808 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 94% | 47,892 psi | 75% | 2920 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,907 psi | 77% | 2838 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,315 psi | 82% | 2910 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,319 psi | 60% | 2717 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,903 psi | 69% | 2844 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 40,669 psi | 64% | 2740 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 90% | 41,176 psi | 65% | 2792 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,978 psi | 44% | 2454 fps | 96.7% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,821 psi | 50% | 2579 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 30,037 psi | 47% | 2566 fps | 95% |
| Bofors RP15 | <<locked>> | 94% | 43,424 psi | 68% | 2838 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 49,371 psi | 77% | 2851 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 41,176 psi | 65% | 2792 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 43,207 psi | 68% | 2720 fps | 96.9% |
| Hodgdon H1000 | <<locked>> | 98% | 43,845 psi | 69% | 2828 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 49,705 psi | 78% | 2864 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 41,510 psi | 65% | 2756 fps | 97% |
| Hodgdon H4350 | <<locked>> | 80% | 44,382 psi | 70% | 2779 fps | 96.5% |
| Hodgdon H4831 | <<locked>> | 94% | 51,401 psi | 81% | 2930 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 94% | 50,314 psi | 79% | 2910 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,897 psi | 56% | 2605 fps | 99.3% |
| Hodgdon Retumbo | <<locked>> | 96% | 40,611 psi | 64% | 2854 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 40,567 psi | 64% | 2766 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,296 psi | 43% | 1667 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,865 psi | 80% | 2851 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,229 psi | 83% | 2887 fps | 99.2% |
| IMR 4350 | <<locked>> | 80% | 38,972 psi | 61% | 2648 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,715 psi | 70% | 2753 fps | 97.7% |
| IMR 4831 | <<locked>> | 80% | 37,869 psi | 59% | 2654 fps | 98.5% |
| IMR 4895 | <<locked>> | 80% | 53,679 psi | 84% | 2940 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 49,676 psi | 78% | 2864 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 94% | 45,716 psi | 72% | 2890 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 50,966 psi | 80% | 2844 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,148 psi | 66% | 2700 fps | 98.3% |
| Lovex S070 | <<locked>> | 80% | 40,350 psi | 63% | 2677 fps | 96.9% |
| Lovex S071 | <<locked>> | 90% | 34,534 psi | 54% | 2572 fps | 95.8% |
| Norma 203B | <<locked>> | 80% | 51,648 psi | 81% | 2897 fps | 100% |
| Norma 204 | <<locked>> | 84% | 44,251 psi | 69% | 2795 fps | 95.9% |
| Norma MRP | 73.2 gr | 86% | 37,594 psi | 59% | 2740 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 39,204 psi | 61% | 2700 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 80% | 52,489 psi | 82% | 2923 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 45,556 psi | 71% | 2897 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 38,029 psi | 60% | 2680 fps | 96.8% |
| Ramshot Magnum | <<locked>> | 94% | 40,495 psi | 63% | 2766 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,760 psi | 44% | 1706 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,661 psi | 78% | 2851 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,659 psi | 73% | 2900 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,320 psi | 62% | 2720 fps | 98.5% |
| ReloadSwiss RS 70 | 69.5 gr | 80% | 38,130 psi | 60% | 2733 fps | 98% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 37,463 psi | 59% | 2772 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 52,823 psi | 83% | 2858 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,470 psi | 73% | 2795 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 45,266 psi | 71% | 2789 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 88% | 42,598 psi | 67% | 2782 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 43,207 psi | 68% | 2720 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,148 psi | 66% | 2700 fps | 98.3% |
| Shooters World Precision | <<locked>> | 80% | 50,966 psi | 80% | 2844 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,350 psi | 63% | 2677 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,863 psi | 75% | 2851 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,659 psi | 75% | 2697 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,307 psi | 65% | 2644 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 42,221 psi | 66% | 2776 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 46,702 psi | 73% | 2795 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 49,530 psi | 78% | 2835 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 35,795 psi | 56% | 2651 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 37,666 psi | 59% | 2644 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 53,374 psi | 84% | 2818 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,476 psi | 84% | 2831 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,657 psi | 70% | 2720 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,611 psi | 64% | 2700 fps | 98.9% |
| Vihtavuori N165 | <<locked>> | 90% | 39,900 psi | 63% | 2684 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 51,634 psi | 81% | 2825 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,987 psi | 63% | 2697 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 31,024 psi | 49% | 2530 fps | 96.8% |
| Vihtavuori N560 | 80 gr | 94% | 50,372 psi | 79% | 2992 fps | 96% |
| Vihtavuori N565 | <<locked>> | 98% | 46,166 psi | 72% | 2897 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,827 psi | 62% | 2667 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 41,655 psi | 65% | 2759 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,569 psi | 39% | 2415 fps | 95.1% |
| Winchester Supreme 780 | <<locked>> | 90% | 42,598 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 88 powders for .300 Weath. Mag. loaded with the .309 | 170gr | Reichenberg HDB Universal. Alliant Reloder-26 delivers the highest muzzle velocity at 3,114 fps; across all powders the maximum-charge window runs from 1,864 fps to 3,114 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 88 of the 88 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 0.309" calls for a 1:12.5 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 .309 | 170gr | Reichenberg HDB Universal 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.