Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 165gr | Federal Trophy Bonded 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, Alliant Reloder-16 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>> | 84% | 53,243 psi | 85% | 2812 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,114 psi | 88% | 2867 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,616 psi | 76% | 2831 fps | 98.1% |
| Accurate 4064 | <<locked>> | 86% | 53,592 psi | 86% | 2864 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,751 psi | 86% | 2956 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 82% | 53,069 psi | 85% | 2887 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,244 psi | 87% | 2894 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,201 psi | 89% | 2992 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,274 psi | 89% | 2887 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 52,837 psi | 85% | 3009 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,665 psi | 88% | 2917 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,027 psi | 88% | 2936 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,534 psi | 87% | 3012 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,883 psi | 90% | 3045 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,954 psi | 87% | 2976 fps | 97% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,860 psi | 72% | 2858 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,479 psi | 63% | 2759 fps | 96.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,184 psi | 82% | 3048 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,362 psi | 90% | 2956 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 55,245 psi | 89% | 2930 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 55,071 psi | 88% | 2907 fps | 98% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,984 psi | 88% | 2917 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,956 psi | 90% | 2946 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 94% | 56,304 psi | 90% | 3009 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 90% | 52,736 psi | 85% | 2907 fps | 97% |
| Hodgdon H4895 | <<locked>> | 82% | 53,621 psi | 86% | 2897 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,636 psi | 88% | 2933 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,417 psi | 86% | 2933 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 52,620 psi | 84% | 2979 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,071 psi | 58% | 1811 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,708 psi | 88% | 2900 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,056 psi | 87% | 2881 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,592 psi | 86% | 2874 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,243 psi | 85% | 2854 fps | 98.2% |
| IMR 4350 | <<locked>> | 96% | 55,666 psi | 89% | 2936 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,359 psi | 86% | 2881 fps | 98.1% |
| IMR 4831 | <<locked>> | 96% | 54,143 psi | 87% | 2946 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 56,405 psi | 90% | 2966 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,274 psi | 89% | 2887 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 53,011 psi | 85% | 2861 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,535 psi | 89% | 2864 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,838 psi | 86% | 2874 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 53,258 psi | 85% | 2881 fps | 99.1% |
| Lovex S070 | <<locked>> | 94% | 54,143 psi | 87% | 2917 fps | 98.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,479 psi | 63% | 2677 fps | 96.1% |
| Norma 201 | <<locked>> | 84% | 55,201 psi | 89% | 2884 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,767 psi | 89% | 2881 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,244 psi | 87% | 2923 fps | 100% |
| Norma 204 | <<locked>> | 96% | 56,347 psi | 90% | 2986 fps | 97.2% |
| Norma MRPᴾ | <<locked>> | 100% | 50,517 psi | 81% | 2995 fps | 97.8% |
| Norma URP | <<locked>> | 96% | 56,043 psi | 90% | 2995 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 54,897 psi | 88% | 2949 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,824 psi | 88% | 2992 fps | 99.1% |
| Ramshot TAC | <<locked>> | 82% | 55,477 psi | 89% | 2910 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,317 psi | 89% | 2927 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,535 psi | 59% | 1850 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,941 psi | 90% | 2927 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,709 psi | 89% | 3005 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,390 psi | 89% | 3038 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,461 psi | 86% | 2976 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 56,101 psi | 90% | 3061 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 55,956 psi | 90% | 2861 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,709 psi | 89% | 2881 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,376 psi | 89% | 2927 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,098 psi | 85% | 2959 fps | 97% |
| Rottweil R 907 | <<locked>> | 92% | 55,071 psi | 88% | 2907 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 92% | 53,258 psi | 85% | 2881 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,011 psi | 85% | 2861 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,838 psi | 86% | 2874 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,143 psi | 87% | 2917 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,432 psi | 86% | 2933 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,215 psi | 87% | 2890 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,940 psi | 88% | 2913 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,304 psi | 90% | 2818 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,447 psi | 86% | 2769 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,026 psi | 85% | 2828 fps | 98.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,605 psi | 84% | 2953 fps | 96.8% |
| Somchem S335 | <<locked>> | 84% | 55,796 psi | 89% | 2812 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,679 psi | 86% | 2874 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,361 psi | 89% | 2920 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,853 psi | 88% | 2999 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,867 psi | 86% | 2940 fps | 97.9% |
| Vihtavuori N133 | <<locked>> | 82% | 53,388 psi | 86% | 2753 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,825 psi | 90% | 2844 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,333 psi | 90% | 2861 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 53,359 psi | 86% | 2848 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,984 psi | 88% | 2940 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 55,637 psi | 89% | 2884 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,621 psi | 88% | 2858 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,027 psi | 87% | 2943 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,183 psi | 80% | 2940 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,665 psi | 88% | 2907 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,246 psi | 90% | 2936 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,304 psi | 90% | 3009 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,379 psi | 65% | 2890 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,027 psi | 88% | 2920 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,444 psi | 81% | 2871 fps | 96% |
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% | 46,833 psi | 75% | 2713 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,194 psi | 72% | 2697 fps | 95.7% |
| Accurate 3100 | <<locked>> | 92% | 36,303 psi | 58% | 2605 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 44,324 psi | 71% | 2717 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,054 psi | 53% | 2546 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 49,806 psi | 80% | 2835 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 42,380 psi | 68% | 2680 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 96% | 48,356 psi | 78% | 2871 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,880 psi | 83% | 2835 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,890 psi | 74% | 2881 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,424 psi | 68% | 2707 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,397 psi | 73% | 2772 fps | 99.3% |
| Alliant Reloder-16 | 54.3 gr | 80% | 32,996 psi | 53% | 2559 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,869 psi | 59% | 2687 fps | 98.8% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,456 psi | 76% | 2858 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,921 psi | 46% | 2470 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 98% | 37,101 psi | 59% | 2700 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,257 psi | 53% | 2648 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,269 psi | 79% | 2841 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 42,380 psi | 68% | 2713 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 42,873 psi | 69% | 2684 fps | 95.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,343 psi | 82% | 2861 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,989 psi | 69% | 2720 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 84% | 40,248 psi | 65% | 2710 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 86% | 46,427 psi | 74% | 2792 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 50,314 psi | 81% | 2844 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,400 psi | 49% | 2457 fps | 96.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,717 psi | 75% | 2822 fps | 100% |
| Hodgdon Superformance | 66.4 gr | 86% | 42,482 psi | 68% | 2785 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,905 psi | 43% | 1617 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,138 psi | 77% | 2792 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 50,488 psi | 81% | 2828 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,556 psi | 71% | 2717 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,717 psi | 75% | 2740 fps | 96.9% |
| IMR 4350 | <<locked>> | 88% | 43,221 psi | 69% | 2713 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,713 psi | 67% | 2664 fps | 95.4% |
| IMR 4831 | <<locked>> | 80% | 31,995 psi | 51% | 2500 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 46,528 psi | 75% | 2802 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 51,880 psi | 83% | 2835 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,676 psi | 80% | 2812 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,226 psi | 79% | 2762 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 44,599 psi | 72% | 2717 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 36,724 psi | 59% | 2559 fps | 95.5% |
| Lovex S070 | <<locked>> | 84% | 39,755 psi | 64% | 2644 fps | 95.2% |
| Lovex S071 | <<locked>> | 98% | 37,057 psi | 59% | 2621 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 48,762 psi | 78% | 2782 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,284 psi | 79% | 2785 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,744 psi | 72% | 2759 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 49,124 psi | 79% | 2864 fps | 95.6% |
| Norma MRP | <<locked>> | 94% | 41,060 psi | 66% | 2805 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 33,228 psi | 53% | 2546 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 44,614 psi | 72% | 2776 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 36,898 psi | 59% | 2641 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 51,938 psi | 83% | 2854 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,735 psi | 83% | 2871 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,209 psi | 44% | 1654 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,105 psi | 69% | 2697 fps | 96.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,515 psi | 78% | 2887 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,218 psi | 63% | 2749 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,822 psi | 53% | 2559 fps | 95.1% |
| ReloadSwiss RS 70 | 60.8 gr | 82% | 34,693 psi | 56% | 2621 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 52,808 psi | 85% | 2812 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,412 psi | 74% | 2733 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,943 psi | 64% | 2657 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 96% | 46,383 psi | 74% | 2841 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 84% | 42,873 psi | 69% | 2684 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,724 psi | 59% | 2559 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,676 psi | 80% | 2812 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,599 psi | 72% | 2717 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 39,755 psi | 64% | 2644 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,872 psi | 66% | 2707 fps | 99% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,633 psi | 81% | 2831 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,240 psi | 77% | 2802 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,864 psi | 80% | 2723 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,858 psi | 67% | 2589 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,930 psi | 66% | 2608 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 45,934 psi | 74% | 2835 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 49,530 psi | 79% | 2723 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,111 psi | 80% | 2818 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 40,509 psi | 65% | 2661 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 29,820 psi | 48% | 2497 fps | 97.8% |
| Somchem S385 | <<locked>> | 94% | 44,295 psi | 71% | 2769 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 50,299 psi | 81% | 2710 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,398 psi | 74% | 2703 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,688 psi | 75% | 2717 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,580 psi | 62% | 2592 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 34,577 psi | 55% | 2549 fps | 96.1% |
| Vihtavuori N530 | <<locked>> | 80% | 52,156 psi | 84% | 2835 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,020 psi | 72% | 2707 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,098 psi | 55% | 2546 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 86% | 31,473 psi | 50% | 2546 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,026 psi | 55% | 2520 fps | 98.1% |
| Winchester 748 | <<locked>> | 80% | 52,460 psi | 84% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 40,422 psi | 65% | 2717 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,267 psi | 44% | 2487 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,008 psi | 77% | 2805 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 98% | 47,094 psi | 76% | 2812 fps | 95.2% |
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 | 165gr | Federal Trophy Bonded. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,061 fps; across all powders the maximum-charge window runs from 1,811 fps to 3,061 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 58–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:10.0 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 70, Alliant Reloder-16, Hodgdon Superformance rank at the top here: for .300 Win. Mag. with the .308 | 165gr | Federal Trophy Bonded 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.