Load Specifications
Load data in caliber .300 Win. Mag. with .307 | 150gr | Rhino Penetrator bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, ReloadSwiss RS 70 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.
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>> | 86% | 56,318 psi | 90% | 3002 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,723 psi | 88% | 3002 fps | 97.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,384 psi | 76% | 2959 fps | 97.5% |
| Accurate 4064 | <<locked>> | 86% | 53,026 psi | 85% | 3002 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,388 psi | 86% | 3094 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 84% | 55,956 psi | 90% | 3081 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,824 psi | 86% | 3031 fps | 99.8% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,723 psi | 88% | 3123 fps | 96.3% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,969 psi | 88% | 3031 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,318 psi | 90% | 3005 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,304 psi | 90% | 3212 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,534 psi | 87% | 3120 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,099 psi | 87% | 3054 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,505 psi | 87% | 3077 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,215 psi | 87% | 3153 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,434 psi | 89% | 3186 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,722 psi | 86% | 3107 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,614 psi | 72% | 2986 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,850 psi | 82% | 3179 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,130 psi | 90% | 3100 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 54,897 psi | 88% | 3071 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,650 psi | 88% | 3045 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,202 psi | 90% | 3012 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,592 psi | 88% | 3058 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,550 psi | 89% | 3087 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 55,854 psi | 90% | 3146 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 92% | 55,912 psi | 90% | 3100 fps | 97% |
| Hodgdon H4895 | <<locked>> | 82% | 53,316 psi | 85% | 3041 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,375 psi | 87% | 3077 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 52,997 psi | 85% | 3071 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,260 psi | 90% | 3182 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,897 psi | 58% | 1919 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,230 psi | 87% | 3041 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,476 psi | 86% | 3025 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,359 psi | 86% | 3015 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,130 psi | 90% | 3045 fps | 98.2% |
| IMR 4350 | <<locked>> | 96% | 55,419 psi | 89% | 3074 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,098 psi | 85% | 3018 fps | 97.6% |
| IMR 4831 | <<locked>> | 96% | 53,882 psi | 86% | 3084 fps | 99.6% |
| IMR 4895 | <<locked>> | 86% | 55,898 psi | 90% | 3110 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,969 psi | 88% | 3031 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,231 psi | 90% | 3058 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,071 psi | 88% | 3005 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,359 psi | 86% | 3012 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,057 psi | 90% | 3068 fps | 99.1% |
| Lovex S070 | <<locked>> | 94% | 53,867 psi | 86% | 3051 fps | 98% |
| Norma 201 | <<locked>> | 84% | 54,853 psi | 88% | 3028 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,361 psi | 89% | 3025 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,766 psi | 86% | 3064 fps | 99.9% |
| Norma 204 | <<locked>> | 96% | 56,188 psi | 90% | 3127 fps | 96.5% |
| Norma MRPᴾ | <<locked>> | 100% | 50,067 psi | 80% | 3123 fps | 97.1% |
| Norma URP | <<locked>> | 96% | 55,811 psi | 89% | 3133 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 54,520 psi | 87% | 3087 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 96% | 54,665 psi | 88% | 3130 fps | 98.7% |
| Ramshot TAC | <<locked>> | 82% | 55,013 psi | 88% | 3048 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,882 psi | 88% | 3064 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,492 psi | 59% | 1965 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,622 psi | 89% | 3064 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,317 psi | 89% | 3150 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,158 psi | 88% | 3186 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,055 psi | 85% | 3110 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,869 psi | 90% | 3202 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 55,608 psi | 89% | 3009 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,303 psi | 89% | 3025 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,969 psi | 88% | 3068 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,663 psi | 84% | 3091 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 92% | 54,650 psi | 88% | 3045 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,057 psi | 90% | 3068 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,231 psi | 90% | 3058 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,359 psi | 86% | 3012 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,867 psi | 86% | 3051 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 52,939 psi | 85% | 3068 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,737 psi | 86% | 3025 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,607 psi | 88% | 3054 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,014 psi | 90% | 2963 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,258 psi | 85% | 2913 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,275 psi | 90% | 3018 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,170 psi | 84% | 3081 fps | 96.1% |
| Somchem S335 | <<locked>> | 84% | 55,521 psi | 89% | 2956 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,417 psi | 86% | 3015 fps | 99.9% |
| Somchem S355 | <<locked>> | 90% | 54,926 psi | 88% | 3061 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,273 psi | 87% | 3136 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,519 psi | 86% | 3071 fps | 97.2% |
| Vihtavuori N133 | <<locked>> | 84% | 56,391 psi | 90% | 2946 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,521 psi | 89% | 2989 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,941 psi | 90% | 3002 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,391 psi | 90% | 3038 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,563 psi | 87% | 3074 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 55,230 psi | 89% | 3028 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,244 psi | 87% | 2999 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 53,693 psi | 86% | 3077 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,835 psi | 80% | 3074 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,520 psi | 87% | 3048 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,680 psi | 89% | 3081 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,101 psi | 90% | 3150 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,103 psi | 64% | 3009 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,534 psi | 87% | 3058 fps | 100% |
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% | 46,398 psi | 74% | 2851 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 47,964 psi | 77% | 2884 fps | 95.7% |
| Accurate 3100 | <<locked>> | 94% | 38,566 psi | 62% | 2779 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 43,874 psi | 70% | 2844 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 35,172 psi | 56% | 2723 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 49,487 psi | 79% | 2969 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 41,930 psi | 67% | 2805 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 98% | 51,198 psi | 82% | 3058 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,532 psi | 83% | 2976 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,591 psi | 84% | 2953 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,498 psi | 73% | 3015 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 51,053 psi | 82% | 3058 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,003 psi | 67% | 2831 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,049 psi | 72% | 2904 fps | 98.9% |
| Alliant Reloder-16 | 59.3 gr | 82% | 34,795 psi | 56% | 2733 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,608 psi | 59% | 2805 fps | 98.1% |
| Alliant Reloder-19 | <<locked>> | 98% | 50,357 psi | 81% | 3048 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 88% | 30,487 psi | 49% | 2631 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,375 psi | 57% | 2825 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,008 psi | 79% | 2976 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 42,032 psi | 67% | 2838 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 45,223 psi | 73% | 2864 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,997 psi | 85% | 2959 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,937 psi | 82% | 2999 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,728 psi | 69% | 2848 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 86% | 42,743 psi | 69% | 2897 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 88% | 49,211 psi | 79% | 2982 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 49,980 psi | 80% | 2982 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,023 psi | 48% | 2562 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,238 psi | 74% | 2956 fps | 99.8% |
| Hodgdon Superformance | 72.4 gr | 88% | 45,295 psi | 73% | 2976 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,760 psi | 43% | 1719 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,834 psi | 77% | 2930 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 50,169 psi | 80% | 2972 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,034 psi | 71% | 2844 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,586 psi | 75% | 2871 fps | 96.2% |
| IMR 4350 | <<locked>> | 90% | 45,745 psi | 73% | 2897 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 44,092 psi | 71% | 2844 fps | 95.4% |
| IMR 4831 | <<locked>> | 82% | 33,968 psi | 54% | 2674 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 46,195 psi | 74% | 2936 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 51,532 psi | 83% | 2976 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,269 psi | 79% | 2949 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,950 psi | 78% | 2900 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 44,295 psi | 71% | 2851 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 38,696 psi | 62% | 2730 fps | 95.4% |
| Lovex S070 | <<locked>> | 86% | 41,843 psi | 67% | 2818 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 48,399 psi | 78% | 2917 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,849 psi | 78% | 2920 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,425 psi | 71% | 2890 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 52,272 psi | 84% | 3058 fps | 95.7% |
| Norma MRP | <<locked>> | 96% | 43,613 psi | 70% | 2989 fps | 95.2% |
| Norma URP | <<locked>> | 82% | 35,157 psi | 56% | 2720 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 44,222 psi | 71% | 2904 fps | 99% |
| Ramshot Hunter | <<locked>> | 86% | 39,088 psi | 63% | 2822 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 51,488 psi | 83% | 2986 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,314 psi | 82% | 3005 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,195 psi | 44% | 1759 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,931 psi | 69% | 2825 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,066 psi | 77% | 3022 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,943 psi | 62% | 2877 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,853 psi | 56% | 2733 fps | 95.1% |
| ReloadSwiss RS 70 | 66.4 gr | 84% | 36,854 psi | 59% | 2799 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 52,402 psi | 84% | 2956 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,934 psi | 74% | 2864 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 39,508 psi | 63% | 2779 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 98% | 49,400 psi | 79% | 3031 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 86% | 45,223 psi | 73% | 2864 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 82% | 38,696 psi | 62% | 2730 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,269 psi | 79% | 2949 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,295 psi | 71% | 2851 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 41,843 psi | 67% | 2818 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,538 psi | 65% | 2831 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,169 psi | 80% | 2963 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,906 psi | 77% | 2936 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,284 psi | 79% | 2858 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,350 psi | 66% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 43,468 psi | 70% | 2789 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 48,921 psi | 78% | 3022 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 49,139 psi | 79% | 2861 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,879 psi | 80% | 2956 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 40,176 psi | 64% | 2782 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 29,457 psi | 47% | 2605 fps | 96.9% |
| Somchem S385 | <<locked>> | 96% | 46,876 psi | 75% | 2949 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 49,734 psi | 80% | 2848 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,803 psi | 73% | 2841 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,267 psi | 74% | 2848 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,203 psi | 61% | 2713 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 34,287 psi | 55% | 2664 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 51,735 psi | 83% | 2972 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,788 psi | 72% | 2841 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 36,172 psi | 58% | 2720 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 33,272 psi | 53% | 2713 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,852 psi | 54% | 2635 fps | 97.4% |
| Winchester 748 | <<locked>> | 80% | 51,938 psi | 83% | 3022 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 42,917 psi | 69% | 2900 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,877 psi | 46% | 2654 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,688 psi | 76% | 2943 fps | 99.8% |
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 97 powders for .300 Win. Mag. loaded with the .307 | 150gr | Rhino Penetrator. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,212 fps; across all powders the maximum-charge window runs from 1,919 fps to 3,212 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, 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, ADI AR 2209, Alliant Power Pro Varmint 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-16, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .300 Win. 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.