Load Specifications
Bullet:.308 | 165gr | Barnes MRX BT
Bullet Manufacturer:Barnes
Bullet Weight:165 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.300 Win. Mag. load data
Case Length (l3):2.62"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:90.5 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:12.0
Load data in caliber .300 Win. Mag. with .308 | 165gr | Barnes MRX BT bullet and 99 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-17 and ReloadSwiss RS 60.
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% | 53,635 psi | 86% | 2831 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,014 psi | 90% | 2904 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,631 psi | 78% | 2864 fps | 98.5% |
| Accurate 4064 | <<locked>> | 86% | 53,983 psi | 87% | 2884 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,839 psi | 88% | 2989 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 53,867 psi | 86% | 2920 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,969 psi | 88% | 2920 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,304 psi | 90% | 3028 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,144 psi | 90% | 2917 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,099 psi | 87% | 3045 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,564 psi | 89% | 2946 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,927 psi | 90% | 2969 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,854 psi | 90% | 3048 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 53,258 psi | 85% | 3018 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,361 psi | 89% | 3015 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,805 psi | 78% | 2946 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,818 psi | 73% | 2890 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,103 psi | 64% | 2792 fps | 97.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,504 psi | 84% | 3084 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,766 psi | 86% | 2933 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 56,202 psi | 90% | 2963 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,805 psi | 78% | 2946 fps | 96.3% |
| Bofors RP7 | <<locked>> | 92% | 55,956 psi | 90% | 2940 fps | 98.4% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,811 psi | 89% | 2946 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 53,214 psi | 85% | 2920 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 53,650 psi | 86% | 2982 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 90% | 53,954 psi | 87% | 2946 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 82% | 54,447 psi | 87% | 2930 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,898 psi | 90% | 2969 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,418 psi | 87% | 2963 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,824 psi | 86% | 3018 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,969 psi | 58% | 1827 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,535 psi | 89% | 2930 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,940 psi | 88% | 2907 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,404 psi | 87% | 2907 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,882 psi | 86% | 2884 fps | 98.5% |
| IMR 4350 | <<locked>> | 94% | 53,301 psi | 85% | 2917 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,346 psi | 87% | 2920 fps | 98.5% |
| IMR 4831 | <<locked>> | 96% | 55,172 psi | 88% | 2979 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 53,679 psi | 86% | 2943 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 55,883 psi | 90% | 2956 fps | 95.8% |
| IMR 8208 XBR | <<locked>> | 82% | 56,144 psi | 90% | 2917 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 53,882 psi | 86% | 2890 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,420 psi | 90% | 2897 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,505 psi | 87% | 2900 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,056 psi | 87% | 2910 fps | 99.4% |
| Lovex S070 | <<locked>> | 94% | 55,100 psi | 88% | 2949 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,248 psi | 65% | 2707 fps | 96.6% |
| Norma 201 | <<locked>> | 84% | 55,869 psi | 90% | 2913 fps | 100% |
| Norma 202 | <<locked>> | 82% | 53,156 psi | 85% | 2861 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,187 psi | 88% | 2953 fps | 100% |
| Norma 204 | <<locked>> | 94% | 53,954 psi | 87% | 2966 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 51,605 psi | 83% | 3031 fps | 98.3% |
| Norma URP | <<locked>> | 94% | 53,664 psi | 86% | 2972 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 55,927 psi | 90% | 2979 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 56,304 psi | 90% | 3031 fps | 99.4% |
| Ramshot TAC | <<locked>> | 82% | 56,246 psi | 90% | 2940 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,188 psi | 90% | 2956 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,579 psi | 59% | 1870 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 53,461 psi | 86% | 2907 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 53,040 psi | 85% | 2979 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 52,895 psi | 85% | 3015 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,665 psi | 88% | 3012 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 53,635 psi | 86% | 3041 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 86% | 56,376 psi | 90% | 2910 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,318 psi | 90% | 2956 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,346 psi | 87% | 2940 fps | 96% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,302 psi | 87% | 2995 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 92% | 55,956 psi | 90% | 2940 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,056 psi | 87% | 2910 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,882 psi | 86% | 2890 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,505 psi | 87% | 2900 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,100 psi | 88% | 2949 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,505 psi | 87% | 2966 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,926 psi | 88% | 2920 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,840 psi | 90% | 2943 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,490 psi | 86% | 2795 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,259 psi | 87% | 2799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,998 psi | 87% | 2864 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,809 psi | 86% | 2992 fps | 97.4% |
| Somchem S335 | <<locked>> | 82% | 53,229 psi | 85% | 2795 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,694 psi | 88% | 2910 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,159 psi | 90% | 2949 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 56,362 psi | 90% | 3031 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,100 psi | 88% | 2976 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 82% | 53,998 psi | 87% | 2779 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 53,214 psi | 85% | 2825 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,896 psi | 86% | 2841 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,317 psi | 87% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,159 psi | 90% | 2972 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,413 psi | 76% | 2831 fps | 96.4% |
| Vihtavuori N540 | <<locked>> | 86% | 55,419 psi | 89% | 2884 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,969 psi | 88% | 2972 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,285 psi | 82% | 2972 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,898 psi | 90% | 2940 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 53,867 psi | 86% | 2986 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,292 psi | 66% | 2930 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,883 psi | 90% | 2949 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,837 psi | 83% | 2913 fps | 96.7% |
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% | 46,992 psi | 75% | 2736 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,672 psi | 73% | 2723 fps | 96.1% |
| Accurate 3100 | <<locked>> | 92% | 36,680 psi | 59% | 2628 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 44,541 psi | 71% | 2736 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,257 psi | 53% | 2566 fps | 96% |
| ADI AR 2206H | <<locked>> | 80% | 50,415 psi | 81% | 2861 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,815 psi | 69% | 2707 fps | 99% |
| ADI AR 2209 | <<locked>> | 94% | 46,151 psi | 74% | 2848 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,562 psi | 84% | 2864 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,833 psi | 75% | 2917 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,975 psi | 69% | 2733 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,934 psi | 74% | 2799 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,214 psi | 53% | 2585 fps | 96.2% |
| Alliant Reloder-17 | 60.8 gr | 80% | 37,521 psi | 60% | 2717 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 94% | 45,571 psi | 73% | 2838 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,542 psi | 73% | 2884 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 86% | 29,037 psi | 47% | 2490 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,201 psi | 56% | 2667 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,678 psi | 54% | 2674 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,154 psi | 80% | 2874 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 42,714 psi | 68% | 2736 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 45,542 psi | 73% | 2884 fps | 95.4% |
| Bofors RP7 | <<locked>> | 84% | 43,337 psi | 69% | 2713 fps | 95.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,214 psi | 84% | 2890 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,526 psi | 70% | 2746 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 40,915 psi | 66% | 2743 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 84% | 44,324 psi | 71% | 2769 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 50,937 psi | 82% | 2871 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,560 psi | 49% | 2477 fps | 96.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,500 psi | 76% | 2851 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 43,178 psi | 69% | 2818 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,731 psi | 43% | 1631 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,805 psi | 78% | 2822 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,430 psi | 82% | 2858 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,962 psi | 72% | 2743 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,456 psi | 76% | 2772 fps | 97.4% |
| IMR 4350 | <<locked>> | 86% | 41,205 psi | 66% | 2690 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,581 psi | 63% | 2635 fps | 95.1% |
| IMR 4831 | <<locked>> | 80% | 32,242 psi | 52% | 2523 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 47,094 psi | 76% | 2828 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 98% | 52,518 psi | 84% | 2900 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 52,562 psi | 84% | 2864 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,285 psi | 81% | 2838 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,719 psi | 80% | 2789 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 44,918 psi | 72% | 2740 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,028 psi | 59% | 2582 fps | 95.9% |
| Lovex S070 | <<locked>> | 84% | 40,103 psi | 64% | 2671 fps | 95.7% |
| Lovex S071 | <<locked>> | 98% | 37,594 psi | 60% | 2651 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 49,269 psi | 79% | 2808 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,922 psi | 80% | 2808 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,281 psi | 73% | 2785 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 46,963 psi | 75% | 2844 fps | 95.4% |
| Norma MRP | <<locked>> | 94% | 41,829 psi | 67% | 2838 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 33,605 psi | 54% | 2569 fps | 96% |
| Ramshot Big Game | <<locked>> | 80% | 45,498 psi | 73% | 2808 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 37,405 psi | 60% | 2671 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 52,765 psi | 85% | 2884 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,620 psi | 84% | 2900 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,180 psi | 44% | 1673 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,613 psi | 70% | 2726 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,429 psi | 79% | 2920 fps | 99.8% |
| ReloadSwiss RS 60 | 60.8 gr | 80% | 39,958 psi | 64% | 2782 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,156 psi | 53% | 2585 fps | 95.6% |
| ReloadSwiss RS 70 | 63.2 gr | 82% | 35,056 psi | 56% | 2651 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 46,702 psi | 75% | 2756 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,277 psi | 65% | 2680 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 50,995 psi | 82% | 2884 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 94% | 44,266 psi | 71% | 2815 fps | 95% |
| Rottweil R 907 | <<locked>> | 84% | 43,337 psi | 69% | 2713 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,028 psi | 59% | 2582 fps | 95.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,285 psi | 81% | 2838 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,918 psi | 72% | 2740 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 40,103 psi | 64% | 2671 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,524 psi | 67% | 2736 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,111 psi | 82% | 2858 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,950 psi | 78% | 2831 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,386 psi | 81% | 2749 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,293 psi | 68% | 2612 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 38,682 psi | 62% | 2579 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 47,094 psi | 76% | 2874 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 50,038 psi | 80% | 2746 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,981 psi | 82% | 2851 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,915 psi | 66% | 2684 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 30,037 psi | 48% | 2520 fps | 98.1% |
| Somchem S385 | <<locked>> | 92% | 42,003 psi | 67% | 2740 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 50,923 psi | 82% | 2736 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,920 psi | 75% | 2730 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,311 psi | 76% | 2740 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,015 psi | 63% | 2618 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 34,969 psi | 56% | 2572 fps | 96.5% |
| Vihtavuori N165 | <<locked>> | 98% | 44,396 psi | 71% | 2776 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 45,629 psi | 73% | 2733 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,461 psi | 55% | 2572 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 29,646 psi | 48% | 2507 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,389 psi | 55% | 2546 fps | 98.5% |
| Winchester 760 | <<locked>> | 84% | 41,118 psi | 66% | 2746 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,383 psi | 44% | 2513 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,892 psi | 78% | 2841 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 48,196 psi | 77% | 2848 fps | 95.8% |
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 99 powders for .300 Win. Mag. loaded with the .308 | 165gr | Barnes MRX BT. Alliant Reloder-26 delivers the highest muzzle velocity at 3,084 fps; across all powders the maximum-charge window runs from 1,827 fps to 3,084 fps. Accurate 3100 gives the best case fill at 100 %, and 99 of the 99 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 1:12.0 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-17, ReloadSwiss RS 60 rank at the top here: for .300 Win. Mag. with the .308 | 165gr | Barnes MRX BT 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.