Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 150gr | Ferrobull Entox Sport bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and Alliant Reloder-17.
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>> | 84% | 53,171 psi | 85% | 2976 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,535 psi | 89% | 3038 fps | 97.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,283 psi | 77% | 2992 fps | 97.9% |
| Accurate 4064 | <<locked>> | 86% | 53,548 psi | 86% | 3028 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,302 psi | 87% | 3127 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 82% | 53,258 psi | 85% | 3058 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,491 psi | 87% | 3064 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,014 psi | 90% | 3166 fps | 97% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,535 psi | 89% | 3061 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,577 psi | 86% | 3186 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,955 psi | 88% | 3087 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,361 psi | 89% | 3110 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,376 psi | 89% | 3192 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 52,968 psi | 85% | 3163 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,027 psi | 88% | 3153 fps | 96.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,484 psi | 73% | 3022 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,856 psi | 64% | 2913 fps | 96.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,054 psi | 83% | 3215 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,229 psi | 85% | 3071 fps | 99.7% |
| Bofors RP3 | <<locked>> | 88% | 55,753 psi | 89% | 3104 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 55,419 psi | 89% | 3077 fps | 97.8% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,317 psi | 89% | 3087 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,405 psi | 90% | 3120 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 53,345 psi | 86% | 3120 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 90% | 53,345 psi | 86% | 3081 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 82% | 53,838 psi | 86% | 3071 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,506 psi | 89% | 3110 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,882 psi | 86% | 3104 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,505 psi | 86% | 3156 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,781 psi | 57% | 1939 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,984 psi | 88% | 3071 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,288 psi | 87% | 3051 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,085 psi | 87% | 3048 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,490 psi | 86% | 3022 fps | 98% |
| IMR 4350 | <<locked>> | 96% | 56,347 psi | 90% | 3110 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,795 psi | 86% | 3054 fps | 98% |
| IMR 4831 | <<locked>> | 96% | 54,795 psi | 88% | 3117 fps | 99.8% |
| IMR 4895 | <<locked>> | 84% | 53,316 psi | 85% | 3084 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,535 psi | 89% | 3061 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 53,200 psi | 85% | 3031 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,883 psi | 90% | 3038 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,911 psi | 86% | 3041 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 53,577 psi | 86% | 3048 fps | 99% |
| Lovex S070 | <<locked>> | 94% | 54,766 psi | 88% | 3091 fps | 98.4% |
| Norma 201 | <<locked>> | 84% | 55,448 psi | 89% | 3058 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,115 psi | 90% | 3054 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,592 psi | 88% | 3097 fps | 100% |
| Norma 204 | <<locked>> | 94% | 53,447 psi | 86% | 3100 fps | 96.3% |
| Norma MRPᴾ | <<locked>> | 100% | 51,300 psi | 82% | 3166 fps | 97.7% |
| Norma URP | <<locked>> | 94% | 53,272 psi | 85% | 3114 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 86% | 55,463 psi | 89% | 3123 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,782 psi | 89% | 3166 fps | 99.1% |
| Ramshot TAC | <<locked>> | 82% | 55,912 psi | 90% | 3084 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,709 psi | 89% | 3097 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,318 psi | 58% | 1985 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 53,026 psi | 85% | 3041 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,347 psi | 90% | 3186 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,420 psi | 90% | 3222 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,201 psi | 87% | 3150 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 53,229 psi | 85% | 3179 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 82% | 56,043 psi | 90% | 3035 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,898 psi | 90% | 3054 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,622 psi | 89% | 3097 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,954 psi | 87% | 3133 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 92% | 55,419 psi | 89% | 3077 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 92% | 53,577 psi | 86% | 3048 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,200 psi | 85% | 3031 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,911 psi | 86% | 3041 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,766 psi | 88% | 3091 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,867 psi | 86% | 3104 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,389 psi | 87% | 3058 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,405 psi | 89% | 3084 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,127 psi | 85% | 2940 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,012 psi | 87% | 2940 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,490 psi | 86% | 2995 fps | 98% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,461 psi | 86% | 3127 fps | 96.7% |
| Somchem S335 | <<locked>> | 84% | 56,159 psi | 90% | 2986 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,157 psi | 87% | 3048 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,825 psi | 90% | 3094 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,637 psi | 89% | 3169 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,607 psi | 88% | 3107 fps | 97.7% |
| Vihtavuori N133 | <<locked>> | 82% | 53,621 psi | 86% | 2927 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,173 psi | 90% | 3015 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,388 psi | 86% | 2982 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 53,664 psi | 86% | 3015 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,666 psi | 89% | 3110 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 56,043 psi | 90% | 3058 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,911 psi | 88% | 3025 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,549 psi | 87% | 3110 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,836 psi | 82% | 3107 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,724 psi | 89% | 3084 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 53,345 psi | 86% | 3120 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,930 psi | 66% | 3051 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,492 psi | 89% | 3094 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,242 psi | 82% | 3038 fps | 95.9% |
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% | 46,282 psi | 74% | 2867 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,426 psi | 73% | 2854 fps | 95.4% |
| Accurate 3100 | <<locked>> | 94% | 39,044 psi | 63% | 2808 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 43,830 psi | 70% | 2864 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,880 psi | 53% | 2677 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 50,009 psi | 80% | 3002 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 42,453 psi | 68% | 2838 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 96% | 48,950 psi | 78% | 3038 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,141 psi | 84% | 3005 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,340 psi | 74% | 3051 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,482 psi | 68% | 2861 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,513 psi | 73% | 2933 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,880 psi | 53% | 2700 fps | 95.2% |
| Alliant Reloder-17 | 64.6 gr | 80% | 37,043 psi | 59% | 2835 fps | 98.5% |
| Alliant Reloder-19 | <<locked>> | 96% | 48,167 psi | 77% | 3025 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 88% | 30,705 psi | 49% | 2657 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 98% | 37,231 psi | 60% | 2841 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,882 psi | 58% | 2858 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,792 psi | 80% | 3012 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 42,250 psi | 68% | 2864 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 45,803 psi | 73% | 2900 fps | 95.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,721 psi | 83% | 3031 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,004 psi | 69% | 2871 fps | 97.8% |
| Hodgdon H414 | <<locked>> | 86% | 43,323 psi | 69% | 2927 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 86% | 46,818 psi | 75% | 2956 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 50,531 psi | 81% | 3012 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,240 psi | 48% | 2589 fps | 96% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,920 psi | 75% | 2982 fps | 99.9% |
| Hodgdon Superformance | 73.4 gr | 86% | 42,859 psi | 69% | 2943 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,600 psi | 43% | 1732 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,443 psi | 78% | 2959 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 50,778 psi | 81% | 2999 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,614 psi | 72% | 2874 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,050 psi | 75% | 2904 fps | 96.7% |
| IMR 4350 | <<locked>> | 88% | 43,613 psi | 70% | 2874 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,901 psi | 67% | 2818 fps | 95.1% |
| IMR 4831 | <<locked>> | 82% | 34,156 psi | 55% | 2697 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 46,688 psi | 75% | 2966 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 52,141 psi | 84% | 3005 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,835 psi | 80% | 2976 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,342 psi | 79% | 2930 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 44,512 psi | 71% | 2874 fps | 99.9% |
| Lovex S065 | <<locked>> | 82% | 38,914 psi | 62% | 2756 fps | 95.8% |
| Lovex S070 | <<locked>> | 86% | 42,308 psi | 68% | 2851 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 48,602 psi | 78% | 2943 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,414 psi | 79% | 2949 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,889 psi | 72% | 2920 fps | 99.4% |
| Norma 204 | <<locked>> | 92% | 49,806 psi | 80% | 3035 fps | 95.4% |
| Norma MRP | <<locked>> | 96% | 44,498 psi | 71% | 3028 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 33,127 psi | 53% | 2680 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 45,020 psi | 72% | 2940 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 39,711 psi | 64% | 2854 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 52,185 psi | 84% | 3018 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,112 psi | 84% | 3038 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,137 psi | 44% | 1778 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,366 psi | 70% | 2858 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,878 psi | 78% | 3054 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,436 psi | 63% | 2907 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 35,143 psi | 56% | 2756 fps | 95.5% |
| ReloadSwiss RS 70 | 68.9 gr | 84% | 37,318 psi | 60% | 2835 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 52,591 psi | 84% | 2982 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,354 psi | 74% | 2890 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 39,769 psi | 64% | 2805 fps | 99% |
| Rottweil R 905 | <<locked>> | 96% | 46,949 psi | 75% | 3002 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 86% | 45,803 psi | 73% | 2900 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 38,914 psi | 62% | 2756 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,835 psi | 80% | 2976 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,512 psi | 71% | 2874 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 42,308 psi | 68% | 2851 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,118 psi | 66% | 2861 fps | 98.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,778 psi | 81% | 2999 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,544 psi | 78% | 2966 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,777 psi | 80% | 2887 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,756 psi | 67% | 2740 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,959 psi | 66% | 2759 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 49,995 psi | 80% | 3064 fps | 95.9% |
| Somchem S335 | <<locked>> | 80% | 49,414 psi | 79% | 2884 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,618 psi | 81% | 2989 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 40,350 psi | 65% | 2808 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 29,588 psi | 47% | 2628 fps | 97.2% |
| Somchem S385 | <<locked>> | 94% | 44,498 psi | 71% | 2920 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 50,299 psi | 81% | 2874 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,267 psi | 74% | 2864 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,775 psi | 75% | 2877 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,522 psi | 62% | 2740 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 34,577 psi | 55% | 2690 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 52,315 psi | 84% | 3002 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,136 psi | 72% | 2864 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,011 psi | 55% | 2684 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 86% | 31,372 psi | 50% | 2674 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,171 psi | 55% | 2664 fps | 97.8% |
| Winchester 760 | <<locked>> | 86% | 43,526 psi | 70% | 2933 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,906 psi | 46% | 2677 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,298 psi | 77% | 2972 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 98% | 47,848 psi | 77% | 2976 fps | 95% |
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 112 powders for .300 Win. Mag. loaded with the .308 | 150gr | Ferrobull Entox Sport. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,222 fps; across all powders the maximum-charge window runs from 1,939 fps to 3,222 fps. Accurate 3100 gives the best case fill at 100 %, and 112 of the 112 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .300 Win. Mag. with the .308 | 150gr | Ferrobull Entox Sport they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.