Load Specifications
Bullet Manufacturer:TWENTY-NINE
Bullet Weight:161 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:1:10.5
Load data in caliber .300 Win. Mag. with .308 | 161gr | TWENTY-NINE ERTP 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-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% | 53,621 psi | 86% | 2854 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,405 psi | 89% | 2913 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,095 psi | 77% | 2877 fps | 98.1% |
| Accurate 4064 | <<locked>> | 86% | 53,882 psi | 86% | 2910 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,983 psi | 87% | 2999 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 82% | 53,417 psi | 86% | 2933 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,433 psi | 87% | 2936 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,405 psi | 89% | 3035 fps | 97% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,608 psi | 89% | 2933 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,200 psi | 85% | 3058 fps | 99.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 55,245 psi | 89% | 3031 fps | 97.1% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 55,245 psi | 89% | 3031 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,882 psi | 88% | 2959 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,201 psi | 89% | 2982 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,752 psi | 88% | 3054 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,231 psi | 90% | 3091 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,462 psi | 87% | 3022 fps | 97% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,107 psi | 72% | 2900 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,668 psi | 64% | 2799 fps | 96.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,430 psi | 82% | 3087 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,040 psi | 85% | 2946 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 55,622 psi | 89% | 2976 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 55,361 psi | 89% | 2953 fps | 98% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,361 psi | 89% | 2963 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,304 psi | 90% | 2992 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 52,924 psi | 85% | 2995 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 90% | 53,229 psi | 85% | 2956 fps | 97% |
| Hodgdon H4895 | <<locked>> | 82% | 53,969 psi | 87% | 2943 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,100 psi | 88% | 2982 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,621 psi | 86% | 2976 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 52,953 psi | 85% | 3025 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,955 psi | 58% | 1841 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,998 psi | 88% | 2946 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,259 psi | 87% | 2927 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,867 psi | 86% | 2920 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,447 psi | 86% | 2897 fps | 98.1% |
| IMR 4350 | <<locked>> | 96% | 56,043 psi | 90% | 2982 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,693 psi | 86% | 2930 fps | 98.1% |
| IMR 4831 | <<locked>> | 96% | 54,563 psi | 87% | 2992 fps | 99.8% |
| IMR 4895 | <<locked>> | 84% | 53,214 psi | 85% | 2959 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,608 psi | 89% | 2933 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 53,287 psi | 85% | 2907 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,883 psi | 90% | 2910 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,867 psi | 86% | 2913 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 53,534 psi | 86% | 2923 fps | 99.1% |
| Lovex S070 | <<locked>> | 94% | 54,592 psi | 88% | 2963 fps | 98.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,856 psi | 64% | 2720 fps | 96.1% |
| Norma 201 | <<locked>> | 84% | 55,492 psi | 89% | 2930 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,101 psi | 90% | 2927 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,491 psi | 87% | 2966 fps | 100% |
| Norma 204 | <<locked>> | 94% | 53,026 psi | 85% | 2972 fps | 96.4% |
| Norma MRPᴾ | <<locked>> | 100% | 50,836 psi | 82% | 3041 fps | 97.8% |
| Norma URP | <<locked>> | 94% | 52,939 psi | 85% | 2986 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 55,143 psi | 88% | 2992 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,361 psi | 89% | 3038 fps | 99.1% |
| Ramshot TAC | <<locked>> | 82% | 55,564 psi | 89% | 2953 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,724 psi | 89% | 2972 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,608 psi | 59% | 1886 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,420 psi | 90% | 2976 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,941 psi | 90% | 3051 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,811 psi | 89% | 3087 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,766 psi | 86% | 3022 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 52,750 psi | 85% | 3048 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 56,217 psi | 90% | 2907 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,057 psi | 90% | 2927 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,709 psi | 89% | 2972 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,374 psi | 86% | 3002 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 92% | 55,361 psi | 89% | 2953 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 92% | 53,534 psi | 86% | 2923 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,287 psi | 85% | 2907 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,867 psi | 86% | 2913 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,592 psi | 88% | 2963 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,722 psi | 86% | 2979 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,331 psi | 87% | 2933 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,071 psi | 88% | 2953 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,185 psi | 85% | 2815 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,751 psi | 86% | 2815 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,258 psi | 85% | 2871 fps | 98.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,881 psi | 85% | 2995 fps | 96.8% |
| Somchem S335 | <<locked>> | 84% | 56,130 psi | 90% | 2858 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,012 psi | 87% | 2920 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,767 psi | 89% | 2969 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,230 psi | 89% | 3045 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,331 psi | 87% | 2986 fps | 97.8% |
| Vihtavuori N133 | <<locked>> | 82% | 53,650 psi | 86% | 2799 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,246 psi | 90% | 2890 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,156 psi | 85% | 2858 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 53,679 psi | 86% | 2894 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,172 psi | 88% | 2982 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 55,985 psi | 90% | 2933 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,766 psi | 88% | 2900 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,360 psi | 87% | 2986 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,502 psi | 81% | 2982 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,042 psi | 88% | 2953 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,434 psi | 90% | 2982 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 53,142 psi | 85% | 2999 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,654 psi | 65% | 2933 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,172 psi | 88% | 2963 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,792 psi | 81% | 2913 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% | 47,036 psi | 75% | 2756 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,397 psi | 73% | 2736 fps | 95.6% |
| Accurate 3100 | <<locked>> | 94% | 39,073 psi | 63% | 2700 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 44,498 psi | 71% | 2756 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,228 psi | 53% | 2582 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 49,937 psi | 80% | 2874 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 42,583 psi | 68% | 2723 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 96% | 48,704 psi | 78% | 2917 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,025 psi | 83% | 2877 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,108 psi | 74% | 2927 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 48,443 psi | 78% | 2913 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 48,443 psi | 78% | 2913 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,598 psi | 68% | 2746 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,556 psi | 73% | 2815 fps | 99.3% |
| Alliant Reloder-16 | 55.5 gr | 80% | 32,996 psi | 53% | 2595 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,072 psi | 59% | 2726 fps | 98.7% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,790 psi | 77% | 2900 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 86% | 29,095 psi | 47% | 2507 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 98% | 37,304 psi | 60% | 2736 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,926 psi | 58% | 2753 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,690 psi | 80% | 2887 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 42,554 psi | 68% | 2756 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 43,120 psi | 69% | 2726 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,576 psi | 83% | 2904 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,279 psi | 69% | 2762 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 84% | 40,437 psi | 65% | 2753 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 86% | 46,818 psi | 75% | 2838 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 50,502 psi | 81% | 2887 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,574 psi | 49% | 2493 fps | 96.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,978 psi | 75% | 2864 fps | 100% |
| Hodgdon Superformance | 68 gr | 86% | 42,772 psi | 69% | 2828 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,818 psi | 43% | 1647 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,269 psi | 77% | 2835 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 50,792 psi | 81% | 2874 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,744 psi | 72% | 2759 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,065 psi | 75% | 2782 fps | 96.9% |
| IMR 4350 | <<locked>> | 88% | 43,540 psi | 70% | 2759 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 82% | 42,003 psi | 67% | 2707 fps | 95.4% |
| IMR 4831 | <<locked>> | 80% | 32,300 psi | 52% | 2543 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 46,717 psi | 75% | 2844 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 52,025 psi | 83% | 2877 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,995 psi | 80% | 2854 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,443 psi | 79% | 2808 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 44,817 psi | 72% | 2762 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 36,898 psi | 59% | 2598 fps | 95.4% |
| Lovex S070 | <<locked>> | 84% | 39,798 psi | 64% | 2680 fps | 95.1% |
| Lovex S071 | <<locked>> | 98% | 37,391 psi | 60% | 2664 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 48,979 psi | 79% | 2825 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,472 psi | 79% | 2828 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,933 psi | 72% | 2802 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 49,487 psi | 79% | 2910 fps | 95.6% |
| Norma MRP | <<locked>> | 94% | 41,292 psi | 66% | 2848 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 33,388 psi | 54% | 2585 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 44,875 psi | 72% | 2818 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 39,624 psi | 64% | 2743 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 52,141 psi | 84% | 2897 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,938 psi | 83% | 2913 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,311 psi | 44% | 1686 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,366 psi | 70% | 2743 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,849 psi | 78% | 2933 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,421 psi | 63% | 2792 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,011 psi | 53% | 2598 fps | 95.1% |
| ReloadSwiss RS 70 | 62.3 gr | 82% | 34,940 psi | 56% | 2661 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 53,069 psi | 85% | 2861 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,673 psi | 75% | 2776 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,103 psi | 64% | 2697 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 96% | 46,702 psi | 75% | 2884 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 84% | 43,120 psi | 69% | 2726 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,898 psi | 59% | 2598 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,995 psi | 80% | 2854 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,817 psi | 72% | 2762 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 39,798 psi | 64% | 2680 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,147 psi | 66% | 2749 fps | 98.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,807 psi | 81% | 2874 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,501 psi | 78% | 2848 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,893 psi | 80% | 2762 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,916 psi | 67% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 41,162 psi | 66% | 2651 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 46,253 psi | 74% | 2877 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 49,676 psi | 80% | 2762 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,560 psi | 81% | 2867 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 40,712 psi | 65% | 2700 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 29,965 psi | 48% | 2536 fps | 97.7% |
| Somchem S385 | <<locked>> | 94% | 44,440 psi | 71% | 2808 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 50,372 psi | 81% | 2753 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,441 psi | 74% | 2746 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,862 psi | 75% | 2756 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,783 psi | 62% | 2631 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 34,722 psi | 56% | 2585 fps | 96% |
| Vihtavuori N530 | <<locked>> | 80% | 52,286 psi | 84% | 2874 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,324 psi | 73% | 2749 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,345 psi | 55% | 2589 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 86% | 31,705 psi | 51% | 2585 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,316 psi | 55% | 2562 fps | 98.1% |
| Winchester 748 | <<locked>> | 80% | 52,765 psi | 85% | 2927 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 40,611 psi | 65% | 2756 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,441 psi | 44% | 2526 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,269 psi | 77% | 2851 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 98% | 47,485 psi | 76% | 2854 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 99 powders for .300 Win. Mag. loaded with the .308 | 161gr | TWENTY-NINE ERTP. Alliant Reloder-17 delivers the highest muzzle velocity at 3,091 fps; across all powders the maximum-charge window runs from 1,841 fps to 3,091 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 161.0 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, 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 70, Alliant Reloder-16, Hodgdon Superformance rank at the top here: for .300 Win. Mag. with the .308 | 161gr | TWENTY-NINE ERTP 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.