Load Specifications
Load data in caliber .300 Weath. Mag. with .307 | 150gr | Rhino Penetrator bullet and 90 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 and Hodgdon Superformance.
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% | 54,650 psi | 86% | 3005 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,912 psi | 88% | 3068 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,012 psi | 85% | 3107 fps | 99.1% |
| Accurate 4064 | <<locked>> | 84% | 55,071 psi | 86% | 3061 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,028 psi | 88% | 3169 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 57,464 psi | 90% | 3143 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,187 psi | 86% | 3091 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,029 psi | 89% | 3209 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,433 psi | 85% | 3215 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,927 psi | 88% | 3117 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,144 psi | 88% | 3140 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,550 psi | 89% | 3225 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,346 psi | 85% | 3196 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,246 psi | 88% | 3189 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,664 psi | 84% | 3189 fps | 97.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,575 psi | 79% | 3123 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,990 psi | 69% | 3025 fps | 98.1% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,433 psi | 85% | 3268 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,609 psi | 90% | 3159 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,110 psi | 77% | 3100 fps | 96% |
| Bofors RP3 | <<locked>> | 86% | 56,869 psi | 89% | 3133 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,664 psi | 84% | 3189 fps | 97.2% |
| Bofors RP7 | <<locked>> | 90% | 56,304 psi | 88% | 3114 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 86% | 57,334 psi | 90% | 3153 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 54,549 psi | 85% | 3159 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 88% | 54,230 psi | 85% | 3114 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,956 psi | 89% | 3146 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,882 psi | 86% | 3133 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 54,781 psi | 86% | 3192 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,318 psi | 57% | 1975 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,608 psi | 87% | 3100 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,592 psi | 86% | 3074 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,276 psi | 90% | 3110 fps | 98.8% |
| IMR 4350 | <<locked>> | 94% | 57,203 psi | 90% | 3146 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,578 psi | 86% | 3087 fps | 98.4% |
| IMR 4831 | <<locked>> | 94% | 56,289 psi | 88% | 3156 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,580 psi | 90% | 3169 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 56,202 psi | 88% | 3064 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,955 psi | 86% | 3071 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,665 psi | 86% | 3084 fps | 99.3% |
| Lovex S070 | <<locked>> | 92% | 55,912 psi | 88% | 3127 fps | 98.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,730 psi | 70% | 2936 fps | 97.5% |
| Norma 201 | <<locked>> | 82% | 56,072 psi | 88% | 3084 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,869 psi | 89% | 3081 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,448 psi | 87% | 3123 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,578 psi | 86% | 3136 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 57,014 psi | 89% | 3281 fps | 98.9% |
| Norma URP | <<locked>> | 92% | 54,679 psi | 86% | 3150 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 84% | 56,304 psi | 88% | 3150 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 57,232 psi | 90% | 3205 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,833 psi | 73% | 3035 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,912 psi | 58% | 2021 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,232 psi | 90% | 3133 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,334 psi | 90% | 3215 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 53,650 psi | 84% | 3189 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,898 psi | 88% | 3186 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,346 psi | 85% | 3212 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 56,942 psi | 89% | 3084 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,971 psi | 89% | 3130 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,143 psi | 86% | 3114 fps | 96% |
| Rottweil R 905 | <<locked>> | 98% | 55,492 psi | 87% | 3176 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 90% | 56,304 psi | 88% | 3114 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,665 psi | 86% | 3084 fps | 99.3% |
| Shooters World Precision | <<locked>> | 84% | 54,955 psi | 86% | 3071 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,912 psi | 88% | 3127 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,042 psi | 86% | 3136 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,970 psi | 88% | 3110 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,768 psi | 89% | 3009 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,375 psi | 85% | 2963 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,186 psi | 85% | 3028 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,013 psi | 86% | 3173 fps | 97.4% |
| Somchem S335 | <<locked>> | 82% | 56,536 psi | 89% | 3005 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,782 psi | 89% | 3123 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 53,838 psi | 84% | 3153 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,231 psi | 88% | 3150 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 82% | 57,290 psi | 90% | 2992 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,203 psi | 90% | 3045 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,508 psi | 90% | 3058 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,636 psi | 86% | 3045 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,753 psi | 89% | 3146 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,967 psi | 81% | 3061 fps | 97.2% |
| Vihtavuori N540 | <<locked>> | 84% | 55,622 psi | 87% | 3048 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,825 psi | 87% | 3146 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,695 psi | 89% | 3212 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,261 psi | 90% | 3264 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,724 psi | 89% | 3110 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,752 psi | 86% | 3163 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,890 psi | 72% | 3179 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,028 psi | 88% | 3117 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,710 psi | 89% | 3146 fps | 97.5% |
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 2495 | <<locked>> | 80% | 51,184 psi | 80% | 2953 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,008 psi | 77% | 2946 fps | 96.8% |
| Accurate 3100 | <<locked>> | 90% | 38,290 psi | 60% | 2799 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 48,501 psi | 76% | 2956 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,840 psi | 58% | 2789 fps | 96.9% |
| ADI AR 2206H | <<locked>> | 80% | 53,809 psi | 84% | 3084 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,774 psi | 72% | 2923 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 92% | 46,789 psi | 73% | 3015 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,546 psi | 79% | 3146 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,340 psi | 73% | 2949 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,342 psi | 77% | 3018 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,969 psi | 56% | 2799 fps | 96.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,930 psi | 64% | 2940 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 92% | 46,325 psi | 73% | 3005 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 46,717 psi | 73% | 3054 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 84% | 30,008 psi | 47% | 2641 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 94% | 36,303 psi | 57% | 2835 fps | 95.4% |
| Alliant Reloder-26 | 76 gr | 86% | 34,940 psi | 55% | 2841 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,780 psi | 84% | 3097 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 46,050 psi | 72% | 3038 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 46,717 psi | 73% | 2963 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 46,717 psi | 73% | 3054 fps | 95.4% |
| Bofors RP7 | <<locked>> | 82% | 43,642 psi | 68% | 2871 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 47,050 psi | 74% | 2969 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 82% | 41,539 psi | 65% | 2900 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 82% | 44,628 psi | 70% | 2927 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,504 psi | 53% | 2687 fps | 97.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,314 psi | 80% | 3074 fps | 100% |
| Hodgdon Superformance | 76.5 gr | 84% | 43,830 psi | 69% | 2982 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,180 psi | 43% | 1768 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,069 psi | 82% | 3041 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,138 psi | 75% | 2959 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,488 psi | 79% | 2989 fps | 97.8% |
| IMR 4350 | <<locked>> | 84% | 41,814 psi | 66% | 2851 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,511 psi | 67% | 2848 fps | 95.7% |
| IMR 4831 | <<locked>> | 80% | 35,520 psi | 56% | 2740 fps | 96.6% |
| IMR 4895 | <<locked>> | 80% | 50,633 psi | 79% | 3054 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,895 psi | 83% | 3009 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,486 psi | 76% | 2963 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,958 psi | 63% | 2795 fps | 96.5% |
| Lovex S070 | <<locked>> | 82% | 40,814 psi | 64% | 2828 fps | 95.5% |
| Lovex S071 | <<locked>> | 94% | 36,709 psi | 58% | 2759 fps | 95% |
| Norma 201 | <<locked>> | 80% | 52,649 psi | 83% | 3025 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,403 psi | 84% | 3028 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,718 psi | 76% | 3009 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 47,587 psi | 75% | 3009 fps | 95.3% |
| Norma MRP | <<locked>> | 92% | 43,105 psi | 68% | 3009 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 36,709 psi | 58% | 2785 fps | 96.7% |
| Ramshot Big Game | <<locked>> | 80% | 49,110 psi | 77% | 3028 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 38,203 psi | 60% | 2828 fps | 95.4% |
| Ramshot Magnum | <<locked>> | 98% | 43,540 psi | 68% | 2966 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,615 psi | 43% | 1811 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,079 psi | 74% | 2949 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,505 psi | 84% | 3150 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,497 psi | 68% | 3005 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,695 psi | 57% | 2802 fps | 96.5% |
| ReloadSwiss RS 70 | 70 gr | 80% | 35,694 psi | 56% | 2805 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 50,241 psi | 79% | 2976 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,830 psi | 69% | 2900 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 94% | 51,750 psi | 81% | 3054 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 92% | 45,368 psi | 71% | 2986 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 82% | 43,642 psi | 68% | 2871 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,958 psi | 63% | 2795 fps | 96.5% |
| Shooters World Precision | <<locked>> | 80% | 48,486 psi | 76% | 2963 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 40,814 psi | 64% | 2828 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,005 psi | 71% | 2956 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,431 psi | 82% | 3051 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,476 psi | 84% | 2963 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,223 psi | 71% | 2815 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 41,771 psi | 65% | 2792 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 48,211 psi | 76% | 3045 fps | 95.9% |
| Somchem S335 | <<locked>> | 80% | 53,214 psi | 83% | 2956 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,135 psi | 69% | 2900 fps | 99.7% |
| Somchem S365 | <<locked>> | 80% | 33,228 psi | 52% | 2736 fps | 98.8% |
| Somchem S385 | <<locked>> | 90% | 43,265 psi | 68% | 2907 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 54,041 psi | 85% | 2946 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,459 psi | 79% | 2943 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,604 psi | 79% | 2953 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,148 psi | 66% | 2825 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 38,058 psi | 60% | 2785 fps | 97.1% |
| Vihtavuori N165 | <<locked>> | 96% | 45,455 psi | 71% | 2940 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 49,023 psi | 77% | 2943 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,681 psi | 59% | 2785 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 82% | 31,082 psi | 49% | 2671 fps | 95.2% |
| Vihtavuori N560 | <<locked>> | 98% | 53,447 psi | 84% | 3199 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,347 psi | 59% | 2753 fps | 99% |
| Winchester 760 | <<locked>> | 82% | 41,727 psi | 65% | 2904 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 86% | 28,471 psi | 45% | 2674 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,475 psi | 82% | 3058 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 49,124 psi | 77% | 3015 fps | 95.9% |
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 .307 | 150gr | Rhino Penetrator. Norma MRP delivers the highest muzzle velocity at 3,281 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,281 fps. Accurate 3100 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 150.0 gr projectile in 0.307" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, Alliant Reloder-23 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. ReloadSwiss RS 70, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for .300 Weath. Mag. with the .307 | 150gr | 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.