Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 150gr | Hornady ECX bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-16 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 2015 | <<locked>> | 82% | 55,521 psi | 89% | 2963 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 54,723 psi | 88% | 2989 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 53,606 psi | 86% | 2989 fps | 97% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,021 psi | 74% | 2940 fps | 97.2% |
| Accurate 4064 | <<locked>> | 88% | 54,882 psi | 88% | 3038 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 55,709 psi | 89% | 3136 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 84% | 55,114 psi | 88% | 3074 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,376 psi | 90% | 3077 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,867 psi | 86% | 3114 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 82% | 53,911 psi | 86% | 3022 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,158 psi | 88% | 2995 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,216 psi | 89% | 3202 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,156 psi | 85% | 3045 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,577 psi | 86% | 3068 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,113 psi | 85% | 3140 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,491 psi | 87% | 3176 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,823 psi | 85% | 3097 fps | 96.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,395 psi | 70% | 2966 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,458 psi | 79% | 3156 fps | 99.2% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,071 psi | 88% | 3087 fps | 99.7% |
| Bofors RP3 | <<locked>> | 88% | 53,490 psi | 86% | 3058 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 53,476 psi | 86% | 3028 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,230 psi | 89% | 3002 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,577 psi | 86% | 3048 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,520 psi | 87% | 3074 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 94% | 54,650 psi | 88% | 3130 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 92% | 55,085 psi | 88% | 3094 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 84% | 55,695 psi | 89% | 3087 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,185 psi | 85% | 3061 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,680 psi | 89% | 3120 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,288 psi | 89% | 3169 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,781 psi | 57% | 1923 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 53,447 psi | 86% | 3035 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 56,043 psi | 90% | 3068 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,622 psi | 89% | 3058 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,390 psi | 89% | 3038 fps | 98% |
| IMR 4350 | <<locked>> | 96% | 54,331 psi | 87% | 3061 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,535 psi | 89% | 3068 fps | 98% |
| IMR 4831 | <<locked>> | 98% | 56,202 psi | 90% | 3127 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 54,984 psi | 88% | 3100 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 53,911 psi | 86% | 3022 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,100 psi | 88% | 3048 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,360 psi | 87% | 2999 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 55,651 psi | 89% | 3054 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,085 psi | 88% | 3058 fps | 99% |
| Lovex S070 | <<locked>> | 96% | 56,173 psi | 90% | 3094 fps | 98.4% |
| Norma 201 | <<locked>> | 84% | 53,577 psi | 86% | 3012 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,230 psi | 87% | 3015 fps | 100% |
| Norma 203B | <<locked>> | 88% | 56,144 psi | 90% | 3107 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,042 psi | 88% | 3110 fps | 96.3% |
| Norma MRPᴾ | <<locked>> | 100% | 49,008 psi | 79% | 3107 fps | 96.9% |
| Norma URP | <<locked>> | 96% | 54,578 psi | 88% | 3120 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 86% | 53,374 psi | 86% | 3074 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 96% | 53,461 psi | 86% | 3114 fps | 98.6% |
| Ramshot TAC | <<locked>> | 82% | 53,983 psi | 87% | 3035 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,056 psi | 87% | 3058 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,114 psi | 58% | 1962 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,708 psi | 88% | 3054 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,143 psi | 87% | 3136 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 53,983 psi | 87% | 3173 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,651 psi | 89% | 3159 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,679 psi | 88% | 3186 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 82% | 54,201 psi | 87% | 2992 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 54,302 psi | 87% | 3015 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 53,577 psi | 86% | 3051 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,648 psi | 83% | 3077 fps | 96% |
| Rottweil R 907 | <<locked>> | 92% | 53,476 psi | 86% | 3028 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,085 psi | 88% | 3058 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,100 psi | 88% | 3048 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,651 psi | 89% | 3054 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 56,173 psi | 90% | 3094 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,535 psi | 89% | 3117 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,347 psi | 90% | 3074 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,548 psi | 86% | 3041 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,998 psi | 88% | 2953 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,622 psi | 89% | 2953 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,303 psi | 89% | 3009 fps | 98% |
| Somchem S335 | <<locked>> | 84% | 54,389 psi | 87% | 2949 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,043 psi | 90% | 3061 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 53,882 psi | 86% | 3051 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 53,185 psi | 85% | 3123 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,417 psi | 84% | 3054 fps | 97% |
| Vihtavuori N133 | <<locked>> | 84% | 55,434 psi | 89% | 2936 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 54,331 psi | 87% | 2979 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,085 psi | 88% | 2995 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,419 psi | 89% | 3028 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,432 psi | 86% | 3061 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 82% | 54,186 psi | 87% | 3018 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 53,084 psi | 85% | 2986 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,014 psi | 90% | 3120 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,370 psi | 78% | 3051 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,417 psi | 86% | 3035 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,592 psi | 88% | 3068 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,955 psi | 88% | 3133 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,030 psi | 63% | 2986 fps | 99.7% |
| Winchester StaBALL Match | <<locked>> | 84% | 53,606 psi | 86% | 3051 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 2015 | <<locked>> | 80% | 52,185 psi | 84% | 2913 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,672 psi | 72% | 2828 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 46,876 psi | 75% | 2867 fps | 95.4% |
| Accurate 3100 | <<locked>> | 96% | 39,871 psi | 64% | 2815 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 42,279 psi | 68% | 2825 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 33,794 psi | 54% | 2694 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 48,385 psi | 78% | 2959 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 40,973 psi | 66% | 2792 fps | 98% |
| ADI AR 2209 | <<locked>> | 98% | 50,343 psi | 81% | 3048 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,560 psi | 81% | 2966 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,416 psi | 82% | 2943 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,628 psi | 72% | 2999 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,915 psi | 66% | 2815 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,932 psi | 70% | 2887 fps | 98.7% |
| Alliant Reloder-16 | 59.4 gr | 82% | 33,823 psi | 54% | 2710 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,563 psi | 57% | 2785 fps | 97.8% |
| Alliant Reloder-19 | <<locked>> | 98% | 49,443 psi | 79% | 3035 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 90% | 31,415 psi | 50% | 2667 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 92% | 36,695 psi | 59% | 2867 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,950 psi | 77% | 2966 fps | 99% |
| Bofors RP3 | <<locked>> | 80% | 40,669 psi | 65% | 2818 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 44,295 psi | 71% | 2854 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,025 psi | 83% | 2949 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,966 psi | 80% | 2989 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,510 psi | 67% | 2825 fps | 97.2% |
| Hodgdon H414 | <<locked>> | 88% | 44,527 psi | 71% | 2940 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 88% | 48,153 psi | 77% | 2966 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 48,878 psi | 78% | 2969 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,979 psi | 46% | 2539 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,165 psi | 72% | 2940 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 88% | 44,367 psi | 71% | 2959 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,455 psi | 42% | 1716 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,862 psi | 75% | 2917 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 48,994 psi | 79% | 2959 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,047 psi | 69% | 2828 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,629 psi | 73% | 2858 fps | 96% |
| IMR 4350 | <<locked>> | 90% | 44,889 psi | 72% | 2887 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,163 psi | 69% | 2831 fps | 95.2% |
| IMR 4831 | <<locked>> | 84% | 35,128 psi | 56% | 2710 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 45,049 psi | 72% | 2920 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 50,560 psi | 81% | 2966 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,950 psi | 77% | 2933 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,008 psi | 77% | 2890 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 43,105 psi | 69% | 2835 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 37,739 psi | 61% | 2713 fps | 95.1% |
| Lovex S070 | <<locked>> | 88% | 43,439 psi | 70% | 2861 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 47,152 psi | 76% | 2904 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 47,703 psi | 76% | 2907 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,308 psi | 69% | 2874 fps | 99% |
| Norma 204 | <<locked>> | 94% | 51,401 psi | 82% | 3048 fps | 95.4% |
| Norma MRP | <<locked>> | 98% | 45,571 psi | 73% | 3038 fps | 95.9% |
| Norma URP | <<locked>> | 82% | 34,026 psi | 55% | 2697 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 43,352 psi | 70% | 2890 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 40,799 psi | 65% | 2867 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 50,444 psi | 81% | 2972 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,444 psi | 81% | 2999 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,847 psi | 43% | 1755 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,872 psi | 67% | 2808 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,905 psi | 75% | 3005 fps | 99.1% |
| ReloadSwiss RS 60 | 62.4 gr | 80% | 37,884 psi | 61% | 2858 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 36,245 psi | 58% | 2776 fps | 95.7% |
| ReloadSwiss RS 70 | 68.1 gr | 86% | 38,406 psi | 62% | 2848 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 51,024 psi | 82% | 2943 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,933 psi | 72% | 2851 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 38,203 psi | 61% | 2756 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 98% | 48,138 psi | 77% | 3012 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 86% | 44,295 psi | 71% | 2854 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 82% | 37,739 psi | 61% | 2713 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,950 psi | 77% | 2933 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,105 psi | 69% | 2835 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 43,439 psi | 70% | 2861 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,479 psi | 63% | 2815 fps | 98.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,950 psi | 78% | 2949 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,862 psi | 75% | 2920 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,501 psi | 78% | 2851 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,582 psi | 65% | 2707 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,308 psi | 68% | 2772 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 48,051 psi | 77% | 2848 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,791 psi | 78% | 2943 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 38,972 psi | 62% | 2766 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 28,456 psi | 46% | 2579 fps | 96.4% |
| Somchem S385 | <<locked>> | 96% | 45,803 psi | 73% | 2933 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 48,994 psi | 79% | 2841 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,831 psi | 72% | 2831 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,179 psi | 72% | 2835 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,072 psi | 59% | 2694 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 35,592 psi | 57% | 2703 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 50,676 psi | 81% | 2959 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,671 psi | 70% | 2825 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,012 psi | 56% | 2700 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 88% | 32,082 psi | 51% | 2687 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,851 psi | 53% | 2615 fps | 97.1% |
| Winchester 748 | <<locked>> | 80% | 51,068 psi | 82% | 3012 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 44,730 psi | 72% | 2943 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 92% | 29,617 psi | 47% | 2690 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,615 psi | 75% | 2927 fps | 99.7% |
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 96 powders for .300 Win. Mag. loaded with the .308 | 150gr | Hornady ECX. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,202 fps; across all powders the maximum-charge window runs from 1,923 fps to 3,202 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 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 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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 60, Alliant Reloder-16, ReloadSwiss RS 70 rank at the top here: for .300 Win. Mag. with the .308 | 150gr | Hornady ECX 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.