Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 155gr | Frontier RSBT 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% | 56,391 psi | 90% | 2953 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,173 psi | 90% | 3005 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,173 psi | 90% | 3005 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,028 psi | 90% | 2963 fps | 97.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,326 psi | 76% | 2917 fps | 97.7% |
| Accurate 4064 | <<locked>> | 86% | 53,084 psi | 85% | 2953 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,069 psi | 85% | 3041 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 84% | 56,072 psi | 90% | 3035 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,708 psi | 86% | 2982 fps | 99.8% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,708 psi | 88% | 3077 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,694 psi | 88% | 2979 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,246 psi | 90% | 2953 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,202 psi | 90% | 3163 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,041 psi | 87% | 3005 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,418 psi | 87% | 3025 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,186 psi | 87% | 3104 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,259 psi | 89% | 3133 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,737 psi | 86% | 3061 fps | 96.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,512 psi | 71% | 2940 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,633 psi | 81% | 3127 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,956 psi | 90% | 3048 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 54,926 psi | 88% | 3022 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,505 psi | 87% | 2992 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,159 psi | 90% | 2956 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,520 psi | 87% | 3009 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,593 psi | 89% | 3038 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 90% | 53,505 psi | 86% | 3058 fps | 98% |
| Hodgdon H4350 | <<locked>> | 94% | 53,983 psi | 87% | 3022 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 82% | 53,084 psi | 85% | 2986 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,172 psi | 87% | 3025 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 52,939 psi | 85% | 3022 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,130 psi | 90% | 3130 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,955 psi | 58% | 1883 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 53,359 psi | 86% | 2976 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,622 psi | 89% | 3005 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,840 psi | 90% | 3005 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,114 psi | 88% | 2979 fps | 98.2% |
| IMR 4350 | <<locked>> | 96% | 55,245 psi | 89% | 3025 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,420 psi | 90% | 3028 fps | 98.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,418 psi | 87% | 3045 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 55,840 psi | 90% | 3058 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,694 psi | 88% | 2979 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,173 psi | 90% | 3005 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,071 psi | 88% | 2956 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,171 psi | 85% | 2959 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,970 psi | 90% | 3018 fps | 99.2% |
| Lovex S070 | <<locked>> | 94% | 53,853 psi | 86% | 3005 fps | 98.2% |
| Norma 201 | <<locked>> | 84% | 54,853 psi | 88% | 2976 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,419 psi | 89% | 2976 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,679 psi | 86% | 3012 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,869 psi | 90% | 3071 fps | 96.7% |
| Norma MRPᴾ | <<locked>> | 100% | 50,009 psi | 80% | 3077 fps | 97.3% |
| Norma URP | <<locked>> | 96% | 55,593 psi | 89% | 3084 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 86% | 54,418 psi | 87% | 3038 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,346 psi | 87% | 3077 fps | 98.8% |
| Ramshot TAC | <<locked>> | 82% | 54,998 psi | 88% | 2999 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,897 psi | 88% | 3015 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,579 psi | 59% | 1926 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,521 psi | 89% | 3015 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,274 psi | 89% | 3100 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,969 psi | 88% | 3133 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,011 psi | 85% | 3064 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,695 psi | 89% | 3150 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 82% | 55,680 psi | 89% | 2956 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,347 psi | 89% | 2976 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,766 psi | 88% | 3015 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,591 psi | 84% | 3045 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 92% | 54,505 psi | 87% | 2992 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,970 psi | 90% | 3018 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,173 psi | 90% | 3005 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,171 psi | 85% | 2959 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,853 psi | 86% | 3005 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,026 psi | 85% | 3022 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,751 psi | 86% | 2976 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,563 psi | 87% | 3002 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,912 psi | 90% | 2910 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,127 psi | 85% | 2861 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,304 psi | 90% | 2972 fps | 98.3% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,098 psi | 84% | 3038 fps | 96.3% |
| Somchem S335 | <<locked>> | 84% | 55,535 psi | 89% | 2907 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,447 psi | 86% | 2969 fps | 99.9% |
| Somchem S355 | <<locked>> | 90% | 54,955 psi | 88% | 3012 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,143 psi | 87% | 3084 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,534 psi | 86% | 3025 fps | 97.4% |
| Unknown powder | <<locked>> | 94% | 56,434 psi | 90% | 3091 fps | 99.6% |
| Vihtavuori N133 | <<locked>> | 86% | 55,840 psi | 90% | 2890 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,506 psi | 89% | 2940 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,143 psi | 88% | 2943 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 56,289 psi | 90% | 2992 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 53,287 psi | 85% | 3002 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 86% | 54,853 psi | 88% | 2969 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 53,751 psi | 86% | 3054 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,501 psi | 79% | 3022 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,331 psi | 87% | 2999 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 53,505 psi | 86% | 3058 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,016 psi | 64% | 2966 fps | 99.9% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,883 psi | 90% | 3048 fps | 96.8% |
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% | 46,267 psi | 74% | 2802 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,301 psi | 84% | 2949 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,301 psi | 84% | 2949 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 45,905 psi | 74% | 2785 fps | 95.4% |
| Accurate 3100 | <<locked>> | 94% | 38,377 psi | 62% | 2733 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 43,758 psi | 70% | 2799 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,692 psi | 52% | 2618 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 49,400 psi | 79% | 2923 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 41,989 psi | 67% | 2762 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 98% | 51,097 psi | 82% | 3012 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,503 psi | 83% | 2927 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,620 psi | 84% | 2904 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,600 psi | 73% | 2969 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,930 psi | 67% | 2785 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,020 psi | 72% | 2858 fps | 99.1% |
| Alliant Reloder-16 | 56.4 gr | 80% | 32,634 psi | 52% | 2631 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,521 psi | 59% | 2762 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 98% | 50,270 psi | 81% | 2999 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 88% | 30,443 psi | 49% | 2592 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,259 psi | 57% | 2782 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,936 psi | 78% | 2930 fps | 99.3% |
| Bofors RP3 | <<locked>> | 80% | 41,989 psi | 67% | 2795 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 45,295 psi | 73% | 2822 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,866 psi | 85% | 2907 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,053 psi | 82% | 2953 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,511 psi | 68% | 2795 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 84% | 43,526 psi | 70% | 2867 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 90% | 47,747 psi | 77% | 2910 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 49,922 psi | 80% | 2933 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,066 psi | 48% | 2526 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,282 psi | 74% | 2907 fps | 99.9% |
| Hodgdon Superformance | 70.6 gr | 88% | 45,223 psi | 73% | 2930 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,774 psi | 43% | 1683 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,280 psi | 71% | 2815 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 45,905 psi | 74% | 2851 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,220 psi | 66% | 2740 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 82% | 43,221 psi | 69% | 2756 fps | 95.5% |
| IMR 4350 | <<locked>> | 90% | 45,788 psi | 73% | 2854 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 44,106 psi | 71% | 2802 fps | 95.7% |
| IMR 4831 | <<locked>> | 84% | 32,706 psi | 52% | 2602 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 46,137 psi | 74% | 2887 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 51,503 psi | 83% | 2927 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,284 psi | 79% | 2900 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,776 psi | 78% | 2851 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 44,150 psi | 71% | 2802 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 38,653 psi | 62% | 2687 fps | 95.6% |
| Lovex S070 | <<locked>> | 86% | 41,930 psi | 67% | 2776 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 48,269 psi | 77% | 2867 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,704 psi | 78% | 2871 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,367 psi | 71% | 2844 fps | 99.3% |
| Norma 204 | <<locked>> | 92% | 48,733 psi | 78% | 2946 fps | 95% |
| Norma MRP | <<locked>> | 96% | 43,569 psi | 70% | 2946 fps | 95.5% |
| Norma URP | <<locked>> | 82% | 35,128 psi | 56% | 2677 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 44,382 psi | 71% | 2861 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 39,102 psi | 63% | 2779 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 51,416 psi | 82% | 2936 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,430 psi | 82% | 2963 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,224 psi | 44% | 1722 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,801 psi | 69% | 2779 fps | 96.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,138 psi | 77% | 2976 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,856 psi | 62% | 2831 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,780 psi | 56% | 2694 fps | 95.4% |
| ReloadSwiss RS 70 | 64.8 gr | 84% | 36,883 psi | 59% | 2759 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 52,417 psi | 84% | 2907 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,992 psi | 74% | 2818 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 39,610 psi | 64% | 2736 fps | 99% |
| Rottweil R 905 | <<locked>> | 98% | 49,284 psi | 79% | 2986 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 86% | 45,295 psi | 73% | 2822 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 82% | 38,653 psi | 62% | 2687 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,284 psi | 79% | 2900 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,150 psi | 71% | 2802 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 41,930 psi | 67% | 2776 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,567 psi | 65% | 2789 fps | 98.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,082 psi | 80% | 2917 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,906 psi | 77% | 2890 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,255 psi | 79% | 2808 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,336 psi | 66% | 2667 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 43,381 psi | 70% | 2746 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 48,820 psi | 78% | 2979 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 49,023 psi | 79% | 2808 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,806 psi | 80% | 2910 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 40,059 psi | 64% | 2736 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 29,544 psi | 47% | 2569 fps | 97.2% |
| Somchem S385 | <<locked>> | 94% | 43,903 psi | 70% | 2844 fps | 95.1% |
| Unknown powder | <<locked>> | 80% | 35,578 psi | 57% | 2677 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 46,659 psi | 75% | 2753 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,788 psi | 73% | 2792 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,745 psi | 73% | 2795 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,272 psi | 55% | 2582 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 80% | 35,650 psi | 57% | 2654 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 80% | 45,310 psi | 73% | 2812 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,100 psi | 58% | 2697 fps | 96% |
| Vihtavuori N555 | <<locked>> | 86% | 31,082 psi | 50% | 2615 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,794 psi | 54% | 2595 fps | 97.6% |
| Winchester 760 | <<locked>> | 84% | 43,526 psi | 70% | 2867 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,848 psi | 46% | 2618 fps | 95.5% |
| Winchester Supreme 780 | <<locked>> | 96% | 48,182 psi | 77% | 2917 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 114 powders for .300 Win. Mag. loaded with the .308 | 155gr | Frontier RSBT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,163 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,163 fps. Accurate 3100 gives the best case fill at 100 %, and 114 of the 114 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 155.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, ADI AR 2213 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 .308 | 155gr | Frontier RSBT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2213, Bofors RP15, Hodgdon H4831 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.