Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 165gr | Frontier BTSP 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 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% | 54,694 psi | 88% | 2838 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,130 psi | 90% | 2894 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,284 psi | 79% | 2867 fps | 98.5% |
| Accurate 4064 | <<locked>> | 86% | 54,969 psi | 88% | 2890 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,245 psi | 89% | 2986 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 54,056 psi | 87% | 2913 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,361 psi | 89% | 2920 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 52,997 psi | 85% | 2966 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,246 psi | 90% | 2910 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,331 psi | 87% | 3041 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,883 psi | 90% | 2943 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,246 psi | 90% | 2966 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,912 psi | 90% | 3041 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 53,664 psi | 86% | 3018 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,593 psi | 89% | 3009 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,979 psi | 79% | 2943 fps | 96.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,195 psi | 74% | 2890 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,567 psi | 65% | 2795 fps | 97.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,779 psi | 85% | 3081 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,056 psi | 87% | 2930 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 53,200 psi | 85% | 2907 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,979 psi | 79% | 2943 fps | 96.2% |
| Bofors RP7 | <<locked>> | 92% | 56,115 psi | 90% | 2933 fps | 98.3% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,173 psi | 90% | 2943 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 53,592 psi | 86% | 2917 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 54,041 psi | 87% | 2982 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 90% | 54,027 psi | 87% | 2940 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 82% | 54,679 psi | 88% | 2923 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 56,275 psi | 90% | 2966 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,679 psi | 88% | 2959 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,143 psi | 87% | 3015 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,071 psi | 58% | 1821 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,898 psi | 90% | 2927 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,347 psi | 89% | 2907 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,824 psi | 88% | 2904 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 54,099 psi | 87% | 2881 fps | 98.5% |
| IMR 4350 | <<locked>> | 94% | 53,417 psi | 86% | 2910 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,578 psi | 88% | 2913 fps | 98.5% |
| IMR 4831 | <<locked>> | 96% | 55,695 psi | 89% | 2976 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 54,230 psi | 87% | 2943 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 56,246 psi | 90% | 2910 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,331 psi | 87% | 2890 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 53,156 psi | 85% | 2838 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,839 psi | 88% | 2897 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,288 psi | 87% | 2907 fps | 99.3% |
| Lovex S070 | <<locked>> | 94% | 55,637 psi | 89% | 2949 fps | 98.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,843 psi | 65% | 2710 fps | 96.7% |
| Norma 201 | <<locked>> | 82% | 53,040 psi | 85% | 2858 fps | 100% |
| Norma 202 | <<locked>> | 82% | 53,635 psi | 86% | 2858 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,463 psi | 89% | 2949 fps | 100% |
| Norma 204 | <<locked>> | 94% | 54,172 psi | 87% | 2963 fps | 96.9% |
| Norma MRPᴾ | <<locked>> | 100% | 52,054 psi | 83% | 3031 fps | 98.3% |
| Norma URP | <<locked>> | 94% | 54,099 psi | 87% | 2972 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 86% | 56,275 psi | 90% | 2979 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 56,260 psi | 90% | 3022 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,434 psi | 90% | 2953 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,738 psi | 59% | 1867 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 53,635 psi | 86% | 2900 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 53,272 psi | 85% | 2976 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 53,214 psi | 85% | 3012 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,013 psi | 88% | 3009 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 53,882 psi | 86% | 3035 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 53,577 psi | 86% | 2861 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 53,098 psi | 85% | 2900 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,520 psi | 87% | 2933 fps | 96% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,549 psi | 87% | 2992 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 92% | 56,115 psi | 90% | 2933 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,288 psi | 87% | 2907 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,331 psi | 87% | 2890 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,839 psi | 88% | 2897 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,637 psi | 89% | 2949 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,824 psi | 88% | 2963 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,332 psi | 89% | 2917 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,072 psi | 90% | 2936 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,070 psi | 87% | 2795 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,636 psi | 88% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,230 psi | 87% | 2858 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,041 psi | 87% | 2986 fps | 97.3% |
| Somchem S335 | <<locked>> | 82% | 53,722 psi | 86% | 2792 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,013 psi | 88% | 2904 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 53,156 psi | 85% | 2894 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 52,678 psi | 84% | 2972 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,259 psi | 89% | 2969 fps | 98.2% |
| Vihtavuori N133 | <<locked>> | 82% | 54,534 psi | 87% | 2779 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 53,693 psi | 86% | 2822 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,128 psi | 87% | 2838 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,462 psi | 87% | 2871 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,333 psi | 90% | 2966 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,776 psi | 77% | 2828 fps | 96.4% |
| Vihtavuori N540 | <<locked>> | 86% | 55,753 psi | 89% | 2881 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,259 psi | 89% | 2969 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,764 psi | 83% | 2972 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 56,188 psi | 90% | 2936 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,041 psi | 87% | 2982 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,669 psi | 67% | 2930 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,159 psi | 90% | 2946 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,953 psi | 83% | 2907 fps | 96.6% |
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% | 48,022 psi | 77% | 2740 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,209 psi | 74% | 2723 fps | 96.2% |
| Accurate 3100 | <<locked>> | 92% | 37,434 psi | 60% | 2638 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 45,440 psi | 73% | 2740 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,011 psi | 55% | 2575 fps | 96.2% |
| ADI AR 2206H | <<locked>> | 80% | 50,836 psi | 82% | 2861 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,149 psi | 69% | 2707 fps | 99% |
| ADI AR 2209 | <<locked>> | 94% | 46,354 psi | 74% | 2844 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,924 psi | 85% | 2861 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,021 psi | 75% | 2913 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,453 psi | 70% | 2733 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,412 psi | 74% | 2802 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,663 psi | 54% | 2585 fps | 96.3% |
| Alliant Reloder-17 | 59.8 gr | 80% | 37,898 psi | 61% | 2717 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 94% | 45,847 psi | 74% | 2835 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,905 psi | 74% | 2884 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,891 psi | 45% | 2444 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,650 psi | 57% | 2671 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 88% | 34,229 psi | 55% | 2680 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,386 psi | 81% | 2871 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 43,439 psi | 70% | 2740 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 45,905 psi | 74% | 2884 fps | 95.4% |
| Bofors RP7 | <<locked>> | 82% | 41,220 psi | 66% | 2661 fps | 95% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,576 psi | 84% | 2887 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,918 psi | 70% | 2746 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 41,307 psi | 66% | 2743 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 84% | 44,628 psi | 72% | 2766 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 51,358 psi | 82% | 2871 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,096 psi | 50% | 2484 fps | 97.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,732 psi | 77% | 2848 fps | 100% |
| Hodgdon Superformance | 67.9 gr | 86% | 43,497 psi | 70% | 2815 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,919 psi | 43% | 1627 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,139 psi | 79% | 2818 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,793 psi | 83% | 2854 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,339 psi | 73% | 2740 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,805 psi | 77% | 2769 fps | 97.3% |
| IMR 4350 | <<locked>> | 86% | 41,727 psi | 67% | 2690 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,987 psi | 64% | 2635 fps | 95.1% |
| IMR 4831 | <<locked>> | 80% | 32,866 psi | 53% | 2530 fps | 95.9% |
| IMR 4895 | <<locked>> | 80% | 47,572 psi | 76% | 2831 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 52,924 psi | 85% | 2861 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,734 psi | 81% | 2835 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,241 psi | 81% | 2789 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,672 psi | 73% | 2743 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,623 psi | 60% | 2585 fps | 96% |
| Lovex S070 | <<locked>> | 84% | 40,582 psi | 65% | 2671 fps | 95.7% |
| Lovex S071 | <<locked>> | 96% | 35,897 psi | 58% | 2602 fps | 95% |
| Norma 201 | <<locked>> | 80% | 49,835 psi | 80% | 2808 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,328 psi | 81% | 2808 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,759 psi | 73% | 2785 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 47,137 psi | 76% | 2838 fps | 95.3% |
| Norma MRP | <<locked>> | 94% | 42,250 psi | 68% | 2841 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 34,156 psi | 55% | 2575 fps | 96.1% |
| Ramshot Big Game | <<locked>> | 80% | 45,759 psi | 73% | 2805 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 37,840 psi | 61% | 2674 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,910 psi | 85% | 2897 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,412 psi | 44% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,164 psi | 71% | 2730 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,850 psi | 80% | 2920 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,277 psi | 65% | 2782 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,678 psi | 54% | 2589 fps | 95.7% |
| ReloadSwiss RS 70 | 62.2 gr | 82% | 35,505 psi | 57% | 2651 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 47,456 psi | 76% | 2759 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,944 psi | 66% | 2684 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 51,169 psi | 82% | 2877 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 94% | 44,759 psi | 72% | 2815 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 82% | 41,220 psi | 66% | 2661 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,623 psi | 60% | 2585 fps | 96% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,734 psi | 81% | 2835 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,672 psi | 73% | 2743 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 40,582 psi | 65% | 2671 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,018 psi | 67% | 2736 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,779 psi | 83% | 2861 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,400 psi | 79% | 2828 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,691 psi | 81% | 2746 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,670 psi | 68% | 2608 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,334 psi | 63% | 2585 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 47,355 psi | 76% | 2871 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 50,517 psi | 81% | 2746 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,285 psi | 82% | 2848 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,495 psi | 67% | 2687 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 30,661 psi | 49% | 2526 fps | 98.3% |
| Somchem S385 | <<locked>> | 92% | 42,627 psi | 68% | 2743 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 51,155 psi | 82% | 2730 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,355 psi | 76% | 2726 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,732 psi | 77% | 2740 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,523 psi | 63% | 2618 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 35,491 psi | 57% | 2575 fps | 96.6% |
| Vihtavuori N165 | <<locked>> | 98% | 44,570 psi | 71% | 2769 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 45,948 psi | 74% | 2730 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,954 psi | 56% | 2575 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 84% | 30,414 psi | 49% | 2523 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,824 psi | 56% | 2546 fps | 98.5% |
| Winchester 760 | <<locked>> | 84% | 41,524 psi | 67% | 2746 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 28,065 psi | 45% | 2530 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,153 psi | 79% | 2835 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 48,327 psi | 77% | 2844 fps | 95.7% |
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 112 powders for .300 Win. Mag. loaded with the .308 | 165gr | Frontier BTSP. Alliant Reloder-26 delivers the highest muzzle velocity at 3,081 fps; across all powders the maximum-charge window runs from 1,821 fps to 3,081 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 58–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, 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. ReloadSwiss RS 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .300 Win. Mag. with the .308 | 165gr | Frontier BTSP 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.