Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 165gr | Barnes X BT bullet and 80 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-26 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 2700 | <<locked>> | 82% | 53,287 psi | 85% | 2841 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,911 psi | 88% | 2946 fps | 99.3% |
| Accurate 4064 | <<locked>> | 82% | 54,157 psi | 87% | 2858 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 53,766 psi | 86% | 2949 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 86% | 55,753 psi | 89% | 2917 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 53,809 psi | 86% | 2972 fps | 97.1% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,882 psi | 88% | 3015 fps | 95.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,708 psi | 88% | 3038 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 53,650 psi | 86% | 2894 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 53,954 psi | 87% | 2917 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 53,563 psi | 86% | 2995 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,549 psi | 87% | 3022 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 53,055 psi | 85% | 2959 fps | 97.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,809 psi | 86% | 3018 fps | 97.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,140 psi | 82% | 2963 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,962 psi | 72% | 2881 fps | 98.6% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,418 psi | 87% | 3097 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,792 psi | 80% | 2946 fps | 96.4% |
| Bofors RP3 | <<locked>> | 84% | 54,795 psi | 88% | 2917 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,809 psi | 86% | 3018 fps | 97.4% |
| Bofors RP7 | <<locked>> | 88% | 53,809 psi | 86% | 2887 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 84% | 54,723 psi | 88% | 2923 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 55,129 psi | 88% | 2989 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 88% | 54,795 psi | 88% | 2943 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,085 psi | 87% | 2923 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,608 psi | 89% | 2959 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 54,926 psi | 88% | 3022 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,666 psi | 59% | 1834 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,362 psi | 90% | 2923 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,405 psi | 89% | 2900 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,418 psi | 87% | 2877 fps | 98.6% |
| IMR 4350 | <<locked>> | 92% | 54,418 psi | 87% | 2917 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,158 psi | 88% | 2913 fps | 98.6% |
| IMR 4831 | <<locked>> | 92% | 53,795 psi | 86% | 2936 fps | 99.9% |
| IMR 4895 | <<locked>> | 82% | 55,259 psi | 89% | 2946 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,985 psi | 90% | 2900 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,492 psi | 89% | 2913 fps | 99.5% |
| Lovex S070 | <<locked>> | 90% | 53,708 psi | 86% | 2907 fps | 98.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,325 psi | 74% | 2802 fps | 98.1% |
| Norma 203B | <<locked>> | 82% | 53,272 psi | 85% | 2904 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,824 psi | 88% | 2966 fps | 97.2% |
| Norma MRP | <<locked>> | 98% | 53,534 psi | 86% | 3048 fps | 98.6% |
| Norma URP | <<locked>> | 92% | 55,288 psi | 89% | 2979 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 82% | 53,287 psi | 85% | 2920 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,866 psi | 85% | 3002 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 92% | 53,940 psi | 86% | 2976 fps | 99.2% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,514 psi | 76% | 2881 fps | 96.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,463 psi | 60% | 1877 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,621 psi | 88% | 2907 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,099 psi | 87% | 3015 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 52,953 psi | 85% | 2963 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,752 psi | 88% | 3041 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,961 psi | 70% | 2894 fps | 96.5% |
| Rottweil R 902 | <<locked>> | 82% | 54,897 psi | 88% | 2864 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,882 psi | 88% | 2913 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,376 psi | 89% | 2940 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 98% | 55,811 psi | 89% | 3002 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 88% | 53,809 psi | 86% | 2887 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,492 psi | 89% | 2913 fps | 99.5% |
| Shooters World Precision | <<locked>> | 84% | 55,985 psi | 90% | 2900 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 53,708 psi | 86% | 2907 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,608 psi | 89% | 2963 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,347 psi | 89% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,230 psi | 89% | 2864 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,317 psi | 89% | 2999 fps | 97.6% |
| Somchem S355 | <<locked>> | 86% | 54,607 psi | 88% | 2904 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 54,491 psi | 87% | 2986 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 53,476 psi | 86% | 2930 fps | 98% |
| Vihtavuori N135 | <<locked>> | 82% | 54,940 psi | 88% | 2825 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,940 psi | 88% | 2835 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,608 psi | 89% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 53,983 psi | 87% | 2920 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,272 psi | 84% | 2897 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 82% | 53,171 psi | 85% | 2831 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,272 psi | 85% | 2927 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 98% | 53,998 psi | 87% | 2992 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 53,258 psi | 85% | 2887 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,390 psi | 89% | 2995 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,485 psi | 75% | 3022 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 53,011 psi | 85% | 2913 fps | 96.9% |
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 2700 | <<locked>> | 80% | 50,125 psi | 80% | 2785 fps | 97.2% |
| Accurate 3100 | <<locked>> | 86% | 35,491 psi | 57% | 2572 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 50,879 psi | 82% | 2808 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,015 psi | 63% | 2671 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 80% | 46,847 psi | 75% | 2762 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 47,587 psi | 76% | 2858 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 98% | 51,619 psi | 83% | 2959 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,271 psi | 82% | 2979 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,529 psi | 76% | 2792 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,676 psi | 81% | 2861 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,347 psi | 60% | 2667 fps | 97.8% |
| Alliant Reloder-17 | 61 gr | 80% | 41,916 psi | 67% | 2792 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 47,021 psi | 75% | 2848 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 94% | 44,599 psi | 72% | 2844 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,210 psi | 45% | 2434 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 92% | 35,520 psi | 57% | 2654 fps | 95.4% |
| Alliant Reloder-26 | 65.7 gr | 84% | 34,127 psi | 55% | 2664 fps | 95.8% |
| Bofors RP15 | <<locked>> | 98% | 46,688 psi | 75% | 2884 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 48,254 psi | 77% | 2808 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 44,599 psi | 72% | 2844 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 42,496 psi | 68% | 2674 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 48,515 psi | 78% | 2818 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 80% | 40,176 psi | 64% | 2703 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 82% | 45,658 psi | 73% | 2776 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,114 psi | 56% | 2566 fps | 98.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,185 psi | 84% | 2907 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 41,756 psi | 67% | 2769 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,543 psi | 44% | 1637 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,910 psi | 85% | 2871 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,284 psi | 79% | 2799 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,416 psi | 82% | 2825 fps | 98.1% |
| IMR 4350 | <<locked>> | 84% | 42,873 psi | 69% | 2703 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,511 psi | 70% | 2700 fps | 96.3% |
| IMR 4831 | <<locked>> | 80% | 37,231 psi | 60% | 2618 fps | 97.5% |
| IMR 4895 | <<locked>> | 80% | 51,909 psi | 83% | 2890 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,850 psi | 80% | 2802 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,582 psi | 67% | 2657 fps | 97.3% |
| Lovex S070 | <<locked>> | 80% | 40,001 psi | 64% | 2641 fps | 95.7% |
| Lovex S071 | <<locked>> | 92% | 36,550 psi | 59% | 2598 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 50,067 psi | 80% | 2848 fps | 100% |
| Norma 204 | <<locked>> | 88% | 48,254 psi | 77% | 2851 fps | 95.7% |
| Norma MRP | <<locked>> | 90% | 41,278 psi | 66% | 2805 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 38,305 psi | 61% | 2657 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 80% | 50,096 psi | 80% | 2867 fps | 99.9% |
| Ramshot Grand | <<locked>> | 98% | 49,400 psi | 79% | 2940 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 37,057 psi | 59% | 2638 fps | 95.4% |
| Ramshot Magnum | <<locked>> | 98% | 44,266 psi | 71% | 2815 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,137 psi | 45% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,124 psi | 77% | 2792 fps | 98.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,338 psi | 71% | 2848 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,276 psi | 61% | 2680 fps | 97.4% |
| ReloadSwiss RS 70 | 62 gr | 80% | 37,028 psi | 59% | 2680 fps | 96.5% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 41,162 psi | 66% | 2828 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 51,837 psi | 83% | 2815 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,774 psi | 73% | 2759 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 94% | 52,170 psi | 84% | 2887 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 92% | 46,238 psi | 74% | 2835 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 42,496 psi | 68% | 2674 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,582 psi | 67% | 2657 fps | 97.3% |
| Shooters World Precision | <<locked>> | 80% | 49,850 psi | 80% | 2802 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,001 psi | 64% | 2641 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,064 psi | 74% | 2802 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,238 psi | 74% | 2657 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,741 psi | 65% | 2598 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 45,890 psi | 74% | 2831 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 45,701 psi | 73% | 2753 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 34,911 psi | 56% | 2618 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 41,814 psi | 67% | 2713 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 51,750 psi | 83% | 2779 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,808 psi | 83% | 2789 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,729 psi | 70% | 2684 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,581 psi | 63% | 2654 fps | 97.9% |
| Vihtavuori N165 | <<locked>> | 94% | 43,497 psi | 70% | 2736 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 50,227 psi | 81% | 2785 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,247 psi | 63% | 2661 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 80% | 31,096 psi | 50% | 2520 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,566 psi | 62% | 2621 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 40,321 psi | 65% | 2703 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 82% | 26,905 psi | 43% | 2464 fps | 95.4% |
| Winchester Supreme 780 | <<locked>> | 94% | 46,456 psi | 74% | 2799 fps | 95.4% |
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 80 powders for .300 Win. Mag. loaded with the .308 | 165gr | Barnes X BT. Alliant Reloder-26 delivers the highest muzzle velocity at 3,097 fps; across all powders the maximum-charge window runs from 1,834 fps to 3,097 fps. Accurate 3100 gives the best case fill at 100 %, and 80 of the 80 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 59–90 %, 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 2213, Alliant Reloder-22 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-26, Alliant Reloder-17 rank at the top here: for .300 Win. Mag. with the .308 | 165gr | Barnes X 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.