Load Specifications
Load data in caliber .300 Weath. Mag. with .307 | 165gr | Rhino Penetrator bullet and 88 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 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 2495 | <<locked>> | 82% | 56,898 psi | 89% | 2897 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,346 psi | 85% | 2913 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,550 psi | 89% | 3018 fps | 99.7% |
| Accurate 4064 | <<locked>> | 84% | 57,450 psi | 90% | 2956 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,723 psi | 86% | 3015 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 57,116 psi | 90% | 2989 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,666 psi | 87% | 3058 fps | 98.1% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,188 psi | 90% | 3114 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,855 psi | 89% | 3117 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,563 psi | 86% | 2959 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,708 psi | 86% | 2979 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,434 psi | 87% | 3071 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,985 psi | 89% | 3097 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,027 psi | 86% | 3045 fps | 98.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,289 psi | 88% | 3107 fps | 98.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,243 psi | 83% | 3035 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,209 psi | 72% | 2956 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,508 psi | 90% | 3182 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,401 psi | 81% | 3022 fps | 97.4% |
| Bofors RP3 | <<locked>> | 84% | 55,637 psi | 87% | 2979 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,289 psi | 88% | 3107 fps | 98.4% |
| Bofors RP7 | <<locked>> | 88% | 54,766 psi | 86% | 2959 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 84% | 55,825 psi | 87% | 2992 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 56,898 psi | 89% | 3068 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 88% | 56,420 psi | 88% | 3025 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 98% | 57,319 psi | 90% | 3054 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,144 psi | 88% | 3035 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,927 psi | 88% | 2995 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,276 psi | 90% | 3031 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,107 psi | 71% | 2986 fps | 96.6% |
| Hodgdon Superformance | <<locked>> | 90% | 57,290 psi | 90% | 3104 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,535 psi | 57% | 1880 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,493 psi | 90% | 2992 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,681 psi | 89% | 2972 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,637 psi | 87% | 2953 fps | 99.2% |
| IMR 4350 | <<locked>> | 92% | 55,883 psi | 88% | 2995 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,434 psi | 88% | 2989 fps | 99.2% |
| IMR 4831 | <<locked>> | 92% | 55,085 psi | 86% | 3002 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,144 psi | 88% | 3009 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,056 psi | 86% | 2982 fps | 96.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,346 psi | 85% | 3077 fps | 96.8% |
| Lovex S062 | <<locked>> | 84% | 56,869 psi | 89% | 2963 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,710 psi | 89% | 2989 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 54,476 psi | 85% | 2972 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,050 psi | 74% | 2861 fps | 98.7% |
| Norma 203B | <<locked>> | 84% | 57,580 psi | 90% | 3018 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,826 psi | 89% | 3048 fps | 98.1% |
| Norma MRP | <<locked>> | 98% | 55,883 psi | 88% | 3133 fps | 99.3% |
| Norma URP | <<locked>> | 92% | 56,942 psi | 89% | 3051 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,868 psi | 86% | 2992 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,100 psi | 86% | 3100 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 92% | 55,796 psi | 87% | 3051 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,182 psi | 77% | 2963 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,202 psi | 58% | 1923 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,622 psi | 87% | 2976 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,347 psi | 88% | 3087 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,766 psi | 86% | 3038 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,927 psi | 89% | 3123 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,295 psi | 71% | 2982 fps | 97.8% |
| Rottweil R 902 | <<locked>> | 82% | 55,390 psi | 87% | 2927 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,695 psi | 87% | 2976 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,261 psi | 90% | 3028 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 96% | 54,302 psi | 85% | 3028 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 88% | 54,766 psi | 86% | 2959 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,710 psi | 89% | 2989 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 56,869 psi | 89% | 2963 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,476 psi | 85% | 2972 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,319 psi | 90% | 3035 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,347 psi | 88% | 2854 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,333 psi | 88% | 2936 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,551 psi | 90% | 3084 fps | 98.5% |
| Somchem S355 | <<locked>> | 86% | 55,419 psi | 87% | 2966 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,492 psi | 87% | 2959 fps | 96.2% |
| Somchem S365 | <<locked>> | 94% | 56,608 psi | 89% | 3054 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,911 psi | 86% | 3005 fps | 98.8% |
| Vihtavuori N135 | <<locked>> | 82% | 55,825 psi | 87% | 2884 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,898 psi | 88% | 2897 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,942 psi | 89% | 2943 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,405 psi | 87% | 2989 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,346 psi | 85% | 2979 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 84% | 57,740 psi | 90% | 2943 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,665 psi | 86% | 2995 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,738 psi | 87% | 3061 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,086 psi | 88% | 3120 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,143 psi | 86% | 2956 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,116 psi | 90% | 3071 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,617 psi | 76% | 3097 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,143 psi | 86% | 2999 fps | 98% |
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% | 53,461 psi | 84% | 2848 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,792 psi | 80% | 2854 fps | 97.9% |
| Accurate 3100 | <<locked>> | 86% | 35,041 psi | 55% | 2608 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 50,691 psi | 79% | 2858 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,740 psi | 61% | 2713 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 47,558 psi | 75% | 2828 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 45,629 psi | 72% | 2871 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 96% | 49,806 psi | 78% | 2982 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,924 psi | 83% | 3051 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,138 psi | 75% | 2854 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,300 psi | 80% | 2923 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,681 psi | 59% | 2726 fps | 98.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,888 psi | 67% | 2854 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,467 psi | 67% | 2805 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 92% | 42,917 psi | 67% | 2858 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,746 psi | 43% | 2467 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 90% | 33,446 psi | 52% | 2648 fps | 95.3% |
| Alliant Reloder-26 | 70.3 gr | 82% | 31,749 psi | 50% | 2638 fps | 95.4% |
| Bofors RP15 | <<locked>> | 96% | 45,208 psi | 71% | 2904 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 48,573 psi | 76% | 2864 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 42,917 psi | 67% | 2858 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 42,714 psi | 67% | 2733 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 80% | 48,863 psi | 77% | 2874 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 40,683 psi | 64% | 2762 fps | 96.3% |
| Hodgdon H4350 | <<locked>> | 80% | 43,511 psi | 68% | 2782 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 96% | 53,388 psi | 84% | 2989 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 96% | 52,286 psi | 82% | 2969 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,259 psi | 55% | 2615 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,461 psi | 84% | 2972 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 42,250 psi | 66% | 2917 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 39,740 psi | 62% | 2772 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,267 psi | 43% | 1680 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,954 psi | 85% | 2936 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,038 psi | 78% | 2864 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,272 psi | 82% | 2894 fps | 98.7% |
| IMR 4350 | <<locked>> | 82% | 40,814 psi | 64% | 2713 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,048 psi | 69% | 2762 fps | 97.1% |
| IMR 4831 | <<locked>> | 80% | 37,217 psi | 58% | 2664 fps | 98% |
| IMR 4895 | <<locked>> | 80% | 52,649 psi | 83% | 2953 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 51,692 psi | 81% | 2923 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 96% | 47,514 psi | 74% | 2949 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 50,270 psi | 79% | 2861 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,655 psi | 65% | 2713 fps | 97.8% |
| Lovex S070 | <<locked>> | 80% | 39,769 psi | 62% | 2690 fps | 96.2% |
| Lovex S071 | <<locked>> | 90% | 33,997 psi | 53% | 2582 fps | 95% |
| Norma 203B | <<locked>> | 80% | 50,676 psi | 79% | 2910 fps | 100% |
| Norma 204 | <<locked>> | 84% | 43,265 psi | 68% | 2802 fps | 95% |
| Norma MRP | 73.3 gr | 88% | 39,421 psi | 62% | 2808 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 38,406 psi | 60% | 2707 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 80% | 51,271 psi | 80% | 2933 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 47,659 psi | 75% | 2963 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 37,304 psi | 58% | 2690 fps | 96.1% |
| Ramshot Magnum | <<locked>> | 96% | 42,540 psi | 67% | 2831 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,760 psi | 44% | 1719 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,834 psi | 77% | 2861 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,556 psi | 71% | 2913 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,609 psi | 61% | 2733 fps | 98% |
| ReloadSwiss RS 70 | 68 gr | 80% | 37,347 psi | 59% | 2736 fps | 97.3% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 39,218 psi | 61% | 2835 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 52,156 psi | 82% | 2877 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,701 psi | 72% | 2808 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 47,282 psi | 74% | 2851 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 90% | 44,556 psi | 70% | 2848 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 42,714 psi | 67% | 2733 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,655 psi | 65% | 2713 fps | 97.8% |
| Shooters World Precision | <<locked>> | 80% | 50,270 psi | 79% | 2861 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,769 psi | 62% | 2690 fps | 96.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,891 psi | 73% | 2864 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,891 psi | 73% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,727 psi | 64% | 2654 fps | 96.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 44,164 psi | 69% | 2841 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 46,093 psi | 72% | 2812 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 51,909 psi | 81% | 2900 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 34,998 psi | 55% | 2664 fps | 99.6% |
| Somchem S385 | <<locked>> | 86% | 39,639 psi | 62% | 2713 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 52,489 psi | 82% | 2838 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,446 psi | 82% | 2848 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,874 psi | 69% | 2733 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,813 psi | 62% | 2707 fps | 98.4% |
| Vihtavuori N165 | <<locked>> | 92% | 41,655 psi | 65% | 2746 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 50,778 psi | 80% | 2841 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,320 psi | 62% | 2707 fps | 98.1% |
| Vihtavuori N555 | <<locked>> | 80% | 30,647 psi | 48% | 2546 fps | 96.1% |
| Vihtavuori N560 | <<locked>> | 94% | 48,936 psi | 77% | 2989 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,015 psi | 61% | 2677 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 40,872 psi | 64% | 2766 fps | 96.3% |
| Winchester StaBALL HD | <<locked>> | 82% | 26,194 psi | 41% | 2497 fps | 95.8% |
| Winchester Supreme 780 | <<locked>> | 92% | 44,686 psi | 70% | 2815 fps | 95.7% |
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 .307 | 165gr | Rhino Penetrator. Alliant Reloder-26 delivers the highest muzzle velocity at 3,182 fps; across all powders the maximum-charge window runs from 1,880 fps to 3,182 fps. Accurate 3100 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 165.0 gr projectile in 0.307" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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, ReloadSwiss RS 70 rank at the top here: for .300 Weath. Mag. with the .307 | 165gr | 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.