Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 156gr | Peregrine Backup (VRG-2) bullet and 97 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.
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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>> | 84% | 53,374 psi | 86% | 2913 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,811 psi | 89% | 2982 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,515 psi | 78% | 2940 fps | 98.2% |
| Accurate 4064 | <<locked>> | 86% | 53,882 psi | 86% | 2969 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,578 psi | 88% | 3068 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 82% | 53,679 psi | 86% | 3002 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,824 psi | 88% | 3005 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,231 psi | 90% | 3110 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,956 psi | 90% | 3002 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,882 psi | 86% | 3130 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 56,086 psi | 90% | 3107 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,332 psi | 89% | 3028 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,709 psi | 89% | 3051 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,637 psi | 89% | 3133 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 53,229 psi | 85% | 3104 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,245 psi | 89% | 3097 fps | 97.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,847 psi | 74% | 2969 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,001 psi | 64% | 2861 fps | 96.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,373 psi | 84% | 3163 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,432 psi | 86% | 3012 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 56,028 psi | 90% | 3045 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 55,709 psi | 89% | 3022 fps | 98.1% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,782 psi | 89% | 3031 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 53,098 psi | 85% | 3005 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 92% | 53,592 psi | 86% | 3064 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 90% | 53,693 psi | 86% | 3025 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 82% | 54,259 psi | 87% | 3015 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,854 psi | 90% | 3054 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,317 psi | 87% | 3048 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,838 psi | 86% | 3100 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,839 psi | 57% | 1893 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,245 psi | 89% | 3012 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,636 psi | 88% | 2992 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,360 psi | 87% | 2989 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,795 psi | 86% | 2966 fps | 98.2% |
| IMR 4350 | <<locked>> | 94% | 53,113 psi | 85% | 2995 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,230 psi | 87% | 2999 fps | 98.2% |
| IMR 4831 | <<locked>> | 96% | 55,100 psi | 88% | 3061 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 53,606 psi | 86% | 3028 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,956 psi | 90% | 3002 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 53,519 psi | 86% | 2972 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,028 psi | 90% | 2979 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,230 psi | 87% | 2982 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 53,867 psi | 86% | 2992 fps | 99.2% |
| Lovex S070 | <<locked>> | 94% | 54,940 psi | 88% | 3031 fps | 98.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,987 psi | 64% | 2776 fps | 96.1% |
| Norma 201 | <<locked>> | 84% | 55,622 psi | 89% | 2995 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,376 psi | 90% | 2995 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,969 psi | 88% | 3038 fps | 100% |
| Norma 204 | <<locked>> | 94% | 53,766 psi | 86% | 3045 fps | 96.6% |
| Norma MRPᴾ | <<locked>> | 100% | 51,692 psi | 83% | 3117 fps | 98% |
| Norma URP | <<locked>> | 94% | 53,505 psi | 86% | 3054 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 55,825 psi | 90% | 3064 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,956 psi | 90% | 3107 fps | 99.2% |
| Ramshot TAC | <<locked>> | 82% | 56,115 psi | 90% | 3025 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,115 psi | 90% | 3041 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 53,287 psi | 85% | 2986 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 52,852 psi | 85% | 3064 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 52,765 psi | 85% | 3100 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,607 psi | 88% | 3094 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 53,461 psi | 86% | 3120 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 56,304 psi | 90% | 2976 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,130 psi | 90% | 2995 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,898 psi | 90% | 3038 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,186 psi | 87% | 3077 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 92% | 55,709 psi | 89% | 3022 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 53,867 psi | 86% | 2992 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,519 psi | 86% | 2972 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,230 psi | 87% | 2982 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,940 psi | 88% | 3031 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,201 psi | 87% | 3045 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,578 psi | 88% | 2999 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,579 psi | 89% | 3025 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,345 psi | 86% | 2881 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,244 psi | 87% | 2884 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,635 psi | 86% | 2940 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,693 psi | 86% | 3071 fps | 97% |
| Somchem S335 | <<locked>> | 84% | 56,376 psi | 90% | 2927 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,389 psi | 87% | 2989 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,072 psi | 90% | 3035 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 56,086 psi | 90% | 3114 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,897 psi | 88% | 3051 fps | 98% |
| Vihtavuori N133 | <<locked>> | 82% | 53,853 psi | 86% | 2864 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,376 psi | 90% | 2956 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,635 psi | 86% | 2923 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 53,940 psi | 86% | 2956 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,898 psi | 90% | 3051 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,311 psi | 76% | 2904 fps | 96% |
| Vihtavuori N530 | <<locked>> | 82% | 56,260 psi | 90% | 2999 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,332 psi | 89% | 2969 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,882 psi | 88% | 3054 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,039 psi | 82% | 3048 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,999 psi | 90% | 3025 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 53,592 psi | 86% | 3064 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,017 psi | 66% | 2999 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,782 psi | 89% | 3035 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,590 psi | 83% | 2986 fps | 96.2% |
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% | 46,572 psi | 75% | 2808 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,643 psi | 73% | 2802 fps | 95.7% |
| Accurate 3100 | <<locked>> | 94% | 39,233 psi | 63% | 2756 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 44,121 psi | 71% | 2808 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,011 psi | 53% | 2631 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 50,096 psi | 80% | 2943 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 42,670 psi | 68% | 2785 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 96% | 49,153 psi | 79% | 2986 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,272 psi | 84% | 2943 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,630 psi | 75% | 2995 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 49,110 psi | 79% | 2982 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,743 psi | 69% | 2808 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,658 psi | 73% | 2874 fps | 99.3% |
| Alliant Reloder-16 | 58.6 gr | 80% | 33,083 psi | 53% | 2651 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,275 psi | 60% | 2785 fps | 98.7% |
| Alliant Reloder-19 | <<locked>> | 96% | 48,457 psi | 78% | 2972 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,979 psi | 46% | 2552 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 98% | 37,507 psi | 60% | 2799 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,998 psi | 58% | 2808 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,951 psi | 80% | 2953 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 42,612 psi | 68% | 2812 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 43,149 psi | 69% | 2789 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,054 psi | 83% | 2972 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,352 psi | 70% | 2822 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 84% | 40,712 psi | 65% | 2812 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 86% | 47,195 psi | 76% | 2907 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 50,676 psi | 81% | 2953 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,458 psi | 49% | 2543 fps | 96.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,181 psi | 76% | 2927 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 43,091 psi | 69% | 2894 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,774 psi | 43% | 1693 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,747 psi | 78% | 2904 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 51,039 psi | 82% | 2940 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,831 psi | 72% | 2822 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,152 psi | 76% | 2848 fps | 96.9% |
| IMR 4350 | <<locked>> | 88% | 43,816 psi | 70% | 2822 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 82% | 42,018 psi | 67% | 2766 fps | 95.4% |
| IMR 4831 | <<locked>> | 80% | 32,155 psi | 52% | 2589 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 46,833 psi | 75% | 2907 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 52,272 psi | 84% | 2943 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,053 psi | 80% | 2917 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,559 psi | 79% | 2871 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 44,744 psi | 72% | 2818 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 36,709 psi | 59% | 2648 fps | 95.3% |
| Lovex S070 | <<locked>> | 84% | 39,914 psi | 64% | 2740 fps | 95.1% |
| Lovex S071 | <<locked>> | 98% | 37,449 psi | 60% | 2717 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 48,863 psi | 78% | 2884 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,705 psi | 80% | 2890 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,991 psi | 72% | 2861 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 50,067 psi | 80% | 2979 fps | 95.7% |
| Norma MRP | <<locked>> | 94% | 41,597 psi | 67% | 2910 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 33,402 psi | 54% | 2638 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 45,310 psi | 73% | 2884 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 39,929 psi | 64% | 2805 fps | 95.9% |
| Ramshot TAC | <<locked>> | 80% | 52,562 psi | 84% | 2966 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,475 psi | 84% | 2982 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,569 psi | 70% | 2802 fps | 96.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,168 psi | 79% | 2999 fps | 99.6% |
| ReloadSwiss RS 60 | 63.1 gr | 80% | 39,697 psi | 64% | 2854 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 35,433 psi | 57% | 2713 fps | 96% |
| ReloadSwiss RS 70 | 65.7 gr | 82% | 34,998 psi | 56% | 2717 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 52,779 psi | 85% | 2920 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,586 psi | 75% | 2835 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,045 psi | 64% | 2753 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 96% | 47,224 psi | 76% | 2949 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 84% | 43,149 psi | 69% | 2789 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,709 psi | 59% | 2648 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,053 psi | 80% | 2917 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,744 psi | 72% | 2818 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 39,914 psi | 64% | 2740 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,307 psi | 66% | 2808 fps | 98.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,923 psi | 82% | 2940 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,733 psi | 78% | 2910 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,125 psi | 80% | 2831 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,076 psi | 67% | 2687 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 41,191 psi | 66% | 2707 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 46,775 psi | 75% | 2946 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 49,661 psi | 80% | 2825 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,792 psi | 81% | 2930 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 40,582 psi | 65% | 2756 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 29,849 psi | 48% | 2582 fps | 97.6% |
| Somchem S385 | <<locked>> | 94% | 44,744 psi | 72% | 2871 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 50,676 psi | 81% | 2818 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,644 psi | 75% | 2808 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,079 psi | 75% | 2822 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,798 psi | 62% | 2687 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 34,693 psi | 56% | 2638 fps | 95.9% |
| Vihtavuori N165 | <<locked>> | 98% | 44,193 psi | 71% | 2844 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 52,707 psi | 85% | 2943 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,498 psi | 73% | 2812 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,330 psi | 55% | 2638 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 86% | 31,633 psi | 51% | 2631 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,243 psi | 55% | 2612 fps | 98.1% |
| Winchester 760 | <<locked>> | 84% | 40,901 psi | 66% | 2818 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 29,153 psi | 47% | 2641 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,588 psi | 78% | 2917 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 48,066 psi | 77% | 2923 fps | 95.4% |
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 .308 | 156gr | Peregrine Backup (VRG-2). Alliant Reloder-26 delivers the highest muzzle velocity at 3,163 fps; across all powders the maximum-charge window runs from 1,893 fps to 3,163 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 57–90 %, leaving at least 10 % headroom. The 156.0 gr projectile in 0.308" calls for a 1:15.5 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. ReloadSwiss RS 60, Alliant Reloder-16, ReloadSwiss RS 70 rank at the top here: for .300 Win. Mag. with the .308 | 156gr | Peregrine Backup (VRG-2) 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.