Load Specifications
Load data in caliber .300 Weath. Mag. with .310 | 175gr | Rhino Penetrator bullet and 85 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 Alliant Reloder-26.
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 2700 | <<locked>> | 82% | 56,405 psi | 88% | 2874 fps | 99.2% |
| Accurate 3100 | <<locked>> | 98% | 55,622 psi | 87% | 2927 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 56,115 psi | 88% | 2854 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,406 psi | 90% | 2972 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 53,940 psi | 85% | 3012 fps | 96.3% |
| ADI AR 2208 | <<locked>> | 84% | 55,825 psi | 87% | 2890 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,491 psi | 85% | 2966 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 98% | 56,014 psi | 88% | 3022 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,551 psi | 60% | 2723 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,956 psi | 89% | 2913 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,087 psi | 89% | 2936 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,549 psi | 85% | 2976 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,753 psi | 87% | 2995 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 57,609 psi | 90% | 3009 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,405 psi | 87% | 3018 fps | 98.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,188 psi | 88% | 2995 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,617 psi | 76% | 2930 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,463 psi | 88% | 3084 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,099 psi | 85% | 2992 fps | 98.5% |
| Bofors RP3 | <<locked>> | 82% | 54,331 psi | 85% | 2877 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 55,405 psi | 87% | 3018 fps | 98.8% |
| Bofors RP7 | <<locked>> | 88% | 56,869 psi | 89% | 2920 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,066 psi | 75% | 2871 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 82% | 54,491 psi | 85% | 2894 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,753 psi | 87% | 2969 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 86% | 55,129 psi | 86% | 2927 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 96% | 55,927 psi | 88% | 2959 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,752 psi | 86% | 2940 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,766 psi | 86% | 2897 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,471 psi | 74% | 2972 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 88% | 56,115 psi | 88% | 3009 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,782 psi | 58% | 1831 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,143 psi | 86% | 2867 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,624 psi | 90% | 2910 fps | 99.6% |
| IMR 4350 | <<locked>> | 90% | 54,636 psi | 86% | 2900 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,984 psi | 86% | 2890 fps | 99.4% |
| IMR 4831 | <<locked>> | 92% | 57,624 psi | 90% | 2963 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,319 psi | 90% | 2946 fps | 97.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,058 psi | 89% | 3051 fps | 98% |
| Lovex S062 | <<locked>> | 82% | 55,622 psi | 87% | 2864 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,361 psi | 87% | 2890 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 56,739 psi | 89% | 2933 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,559 psi | 78% | 2835 fps | 99.4% |
| Norma 203B | <<locked>> | 82% | 56,376 psi | 88% | 2920 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,608 psi | 87% | 2956 fps | 98.5% |
| Norma MRP | <<locked>> | 96% | 54,969 psi | 86% | 3038 fps | 99.5% |
| Norma URP | <<locked>> | 90% | 55,796 psi | 87% | 2953 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,217 psi | 90% | 2946 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 53,882 psi | 84% | 3009 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 90% | 54,810 psi | 86% | 2959 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,967 psi | 81% | 2946 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,492 psi | 59% | 1873 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,273 psi | 85% | 2877 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,071 psi | 86% | 2982 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,508 psi | 90% | 2999 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,695 psi | 87% | 3025 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,805 psi | 75% | 2969 fps | 99.1% |
| Rottweil R 902 | <<locked>> | 82% | 57,406 psi | 90% | 2874 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 54,404 psi | 85% | 2874 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,173 psi | 88% | 2936 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 96% | 56,956 psi | 89% | 2995 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 88% | 56,869 psi | 89% | 2920 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,361 psi | 87% | 2890 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 55,622 psi | 87% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,739 psi | 89% | 2933 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,854 psi | 88% | 2933 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,911 psi | 86% | 2756 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,911 psi | 86% | 2844 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,492 psi | 89% | 2992 fps | 98.9% |
| Somchem S355 | <<locked>> | 84% | 54,302 psi | 85% | 2867 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,157 psi | 85% | 2871 fps | 96.6% |
| Somchem S365 | <<locked>> | 92% | 55,666 psi | 87% | 2956 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,508 psi | 90% | 2969 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 86% | 55,535 psi | 87% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,230 psi | 85% | 2894 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,014 psi | 89% | 2946 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 56,304 psi | 88% | 2841 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,072 psi | 89% | 2956 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,940 psi | 86% | 2969 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,013 psi | 86% | 3028 fps | 97.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 50,821 psi | 80% | 2940 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,667 psi | 90% | 2910 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,753 psi | 87% | 2969 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 52,402 psi | 82% | 3071 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,012 psi | 85% | 2910 fps | 98.3% |
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% | 52,750 psi | 83% | 2815 fps | 98.7% |
| Accurate 3100 | <<locked>> | 82% | 32,372 psi | 51% | 2474 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 52,837 psi | 83% | 2808 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,930 psi | 64% | 2690 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 94% | 50,227 psi | 79% | 2943 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 49,356 psi | 77% | 2785 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 41,974 psi | 66% | 2726 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 92% | 45,629 psi | 72% | 2828 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 98% | 36,143 psi | 57% | 2661 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,125 psi | 79% | 2808 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,548 psi | 84% | 2884 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,378 psi | 62% | 2694 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,049 psi | 71% | 2822 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 41,655 psi | 65% | 2717 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 90% | 42,235 psi | 66% | 2772 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,109 psi | 46% | 2448 fps | 97.5% |
| Alliant Reloder-25 | <<locked>> | 88% | 33,040 psi | 52% | 2575 fps | 96% |
| Alliant Reloder-26 | 68.5 gr | 80% | 31,212 psi | 49% | 2559 fps | 96% |
| Bofors RP15 | <<locked>> | 92% | 41,669 psi | 65% | 2756 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 50,908 psi | 80% | 2825 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 42,235 psi | 66% | 2772 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 44,367 psi | 70% | 2697 fps | 97.4% |
| Hodgdon H1000 | <<locked>> | 98% | 44,889 psi | 70% | 2805 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 50,879 psi | 80% | 2835 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 42,627 psi | 67% | 2733 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 80% | 45,513 psi | 71% | 2756 fps | 96.9% |
| Hodgdon H4831 | <<locked>> | 92% | 48,892 psi | 77% | 2838 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 47,892 psi | 75% | 2822 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,043 psi | 58% | 2585 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 94% | 39,044 psi | 61% | 2776 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 41,669 psi | 65% | 2746 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,485 psi | 43% | 1634 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,895 psi | 81% | 2818 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,114 psi | 85% | 2851 fps | 99.3% |
| IMR 4350 | <<locked>> | 80% | 39,900 psi | 63% | 2621 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,730 psi | 72% | 2726 fps | 98% |
| IMR 4831 | <<locked>> | 80% | 39,001 psi | 61% | 2635 fps | 98.9% |
| IMR 4955 Enduron | <<locked>> | 90% | 47,442 psi | 74% | 2776 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 94% | 46,644 psi | 73% | 2864 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 52,185 psi | 82% | 2812 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,323 psi | 68% | 2677 fps | 98.7% |
| Lovex S070 | <<locked>> | 80% | 41,597 psi | 65% | 2661 fps | 97.4% |
| Lovex S071 | <<locked>> | 88% | 33,649 psi | 53% | 2510 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 52,910 psi | 83% | 2867 fps | 100% |
| Norma 204 | <<locked>> | 82% | 42,337 psi | 66% | 2710 fps | 95.5% |
| Norma MRP | 69.9 gr | 84% | 36,172 psi | 57% | 2661 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 40,408 psi | 63% | 2680 fps | 99% |
| Ramshot Big Game | <<locked>> | 80% | 53,476 psi | 84% | 2890 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 43,526 psi | 68% | 2812 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 39,131 psi | 61% | 2664 fps | 97.4% |
| Ramshot Magnum | <<locked>> | 92% | 38,769 psi | 61% | 2687 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,007 psi | 44% | 1673 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,778 psi | 80% | 2822 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,848 psi | 75% | 2871 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,611 psi | 64% | 2703 fps | 98.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,131 psi | 61% | 2710 fps | 98.4% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 35,955 psi | 56% | 2687 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 54,099 psi | 85% | 2825 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,921 psi | 75% | 2769 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 46,238 psi | 72% | 2762 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 86% | 40,872 psi | 64% | 2700 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 44,367 psi | 70% | 2697 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,323 psi | 68% | 2677 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 52,185 psi | 82% | 2812 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,597 psi | 65% | 2661 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,979 psi | 77% | 2822 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,588 psi | 76% | 2664 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,337 psi | 66% | 2621 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 40,509 psi | 63% | 2694 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 47,964 psi | 75% | 2766 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 47,413 psi | 74% | 2753 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 36,956 psi | 58% | 2635 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 38,928 psi | 61% | 2628 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 45,861 psi | 72% | 2694 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,843 psi | 66% | 2677 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 88% | 38,305 psi | 60% | 2608 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 52,692 psi | 83% | 2789 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,118 psi | 64% | 2674 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 80% | 32,401 psi | 51% | 2526 fps | 97.5% |
| Vihtavuori N560 | 76.5 gr | 92% | 47,993 psi | 75% | 2904 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 98% | 47,355 psi | 74% | 2877 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,756 psi | 64% | 2644 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,772 psi | 67% | 2736 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,730 psi | 40% | 2421 fps | 96.5% |
| Winchester Supreme 780 | <<locked>> | 88% | 40,785 psi | 64% | 2667 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 85 powders for .300 Weath. Mag. loaded with the .310 | 175gr | Rhino Penetrator. Alliant Reloder-26 delivers the highest muzzle velocity at 3,084 fps; across all powders the maximum-charge window runs from 1,831 fps to 3,084 fps. ADI AR 2225 gives the best case fill at 100 %, and 85 of the 85 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 175.0 gr projectile in 0.31" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, 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. Norma MRP, Vihtavuori N560, Alliant Reloder-26 rank at the top here: for .300 Weath. Mag. with the .310 | 175gr | Rhino Penetrator 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.