Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 170gr | Geco PLUS bullet and 87 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and ReloadSwiss RS 70.
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>> | 82% | 55,724 psi | 89% | 2822 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 53,301 psi | 85% | 2835 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,085 psi | 88% | 2936 fps | 99.6% |
| Accurate 4064 | <<locked>> | 84% | 56,173 psi | 90% | 2877 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 53,490 psi | 86% | 2933 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 56,101 psi | 90% | 2910 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,259 psi | 87% | 2972 fps | 97.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,666 psi | 89% | 3025 fps | 96.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,651 psi | 89% | 3035 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 53,650 psi | 86% | 2884 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 53,751 psi | 86% | 2900 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,244 psi | 87% | 2992 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,361 psi | 89% | 3012 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 53,664 psi | 86% | 2959 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,650 psi | 88% | 3022 fps | 98.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,561 psi | 83% | 2949 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,991 psi | 72% | 2874 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,448 psi | 89% | 3094 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,995 psi | 80% | 2940 fps | 97.1% |
| Bofors RP3 | <<locked>> | 84% | 54,346 psi | 87% | 2897 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,650 psi | 88% | 3022 fps | 98.2% |
| Bofors RP7 | <<locked>> | 88% | 53,737 psi | 86% | 2881 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 84% | 54,665 psi | 88% | 2913 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 55,637 psi | 89% | 2986 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 88% | 55,288 psi | 89% | 2943 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 98% | 55,724 psi | 89% | 2966 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,737 psi | 88% | 2949 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,534 psi | 87% | 2913 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,014 psi | 90% | 2949 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,005 psi | 71% | 2900 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 90% | 55,811 psi | 89% | 3022 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,448 psi | 58% | 1827 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,506 psi | 89% | 2890 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,665 psi | 88% | 2871 fps | 99% |
| IMR 4350 | <<locked>> | 92% | 54,723 psi | 88% | 2913 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,492 psi | 89% | 2910 fps | 99.1% |
| IMR 4831 | <<locked>> | 92% | 53,780 psi | 86% | 2923 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,129 psi | 88% | 2930 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 53,766 psi | 86% | 2897 fps | 96.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,098 psi | 85% | 2995 fps | 96.5% |
| Lovex S062 | <<locked>> | 84% | 55,883 psi | 90% | 2884 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,535 psi | 89% | 2907 fps | 99.7% |
| Lovex S070 | <<locked>> | 90% | 53,359 psi | 86% | 2894 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,614 psi | 73% | 2779 fps | 98.4% |
| Norma 203B | <<locked>> | 82% | 53,055 psi | 85% | 2887 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,564 psi | 89% | 2969 fps | 97.9% |
| Norma MRP | <<locked>> | 98% | 54,273 psi | 87% | 3045 fps | 99.1% |
| Norma URP | <<locked>> | 92% | 55,608 psi | 89% | 2969 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 53,795 psi | 86% | 2913 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,461 psi | 86% | 3012 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 92% | 54,563 psi | 87% | 2969 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,790 psi | 77% | 2881 fps | 97.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,144 psi | 60% | 1870 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,650 psi | 88% | 2897 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,795 psi | 88% | 3005 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 53,142 psi | 85% | 2949 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,564 psi | 89% | 3041 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,019 psi | 71% | 2897 fps | 97.4% |
| Rottweil R 902 | <<locked>> | 82% | 54,505 psi | 87% | 2848 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,418 psi | 87% | 2894 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,014 psi | 90% | 2943 fps | 97.1% |
| Rottweil R 905 | <<locked>> | 96% | 53,026 psi | 85% | 2946 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 88% | 53,737 psi | 86% | 2881 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,535 psi | 89% | 2907 fps | 99.7% |
| Shooters World Precision | <<locked>> | 84% | 55,883 psi | 90% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 53,359 psi | 86% | 2894 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,086 psi | 90% | 2956 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,405 psi | 89% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,129 psi | 88% | 2858 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,159 psi | 90% | 3002 fps | 98.3% |
| Somchem S355 | <<locked>> | 86% | 54,389 psi | 87% | 2890 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,288 psi | 87% | 2881 fps | 95.9% |
| Somchem S365 | <<locked>> | 94% | 55,013 psi | 88% | 2972 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 53,592 psi | 86% | 2923 fps | 98.6% |
| Vihtavuori N135 | <<locked>> | 82% | 54,737 psi | 88% | 2808 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,897 psi | 88% | 2822 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,651 psi | 89% | 2864 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,288 psi | 87% | 2913 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,953 psi | 85% | 2897 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 82% | 53,258 psi | 85% | 2818 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,490 psi | 86% | 2917 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 98% | 54,172 psi | 87% | 2979 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,563 psi | 87% | 3031 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 53,838 psi | 86% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,637 psi | 89% | 2986 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,847 psi | 75% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 53,766 psi | 86% | 2917 fps | 97.7% |
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% | 52,388 psi | 84% | 2776 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,893 psi | 80% | 2779 fps | 97.7% |
| Accurate 3100 | <<locked>> | 86% | 34,098 psi | 55% | 2533 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 49,661 psi | 80% | 2782 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,898 psi | 61% | 2641 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 80% | 46,688 psi | 75% | 2753 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 44,686 psi | 72% | 2792 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 96% | 48,617 psi | 78% | 2897 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,648 psi | 83% | 2969 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,253 psi | 76% | 2779 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,488 psi | 81% | 2848 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,840 psi | 59% | 2651 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,901 psi | 67% | 2779 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,338 psi | 71% | 2785 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,887 psi | 67% | 2779 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,108 psi | 43% | 2398 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 92% | 34,780 psi | 56% | 2635 fps | 96% |
| Alliant Reloder-26 | 67 gr | 82% | 30,995 psi | 50% | 2566 fps | 95% |
| Bofors RP15 | <<locked>> | 96% | 43,903 psi | 70% | 2818 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 47,529 psi | 76% | 2789 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 41,887 psi | 67% | 2779 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 41,945 psi | 67% | 2661 fps | 96.1% |
| Hodgdon H380 | <<locked>> | 80% | 47,964 psi | 77% | 2799 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 39,856 psi | 64% | 2687 fps | 96.1% |
| Hodgdon H4350 | <<locked>> | 80% | 42,627 psi | 68% | 2707 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 96% | 52,156 psi | 84% | 2907 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,053 psi | 82% | 2887 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,374 psi | 55% | 2543 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,344 psi | 84% | 2894 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,278 psi | 66% | 2835 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 38,783 psi | 62% | 2694 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,267 psi | 44% | 1634 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,066 psi | 79% | 2785 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,401 psi | 82% | 2818 fps | 98.6% |
| IMR 4350 | <<locked>> | 82% | 40,045 psi | 64% | 2638 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,323 psi | 69% | 2690 fps | 96.9% |
| IMR 4831 | <<locked>> | 80% | 36,419 psi | 58% | 2595 fps | 97.8% |
| IMR 4895 | <<locked>> | 80% | 51,750 psi | 83% | 2877 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 50,531 psi | 81% | 2841 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 98% | 49,705 psi | 80% | 2930 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 49,284 psi | 79% | 2782 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,857 psi | 66% | 2638 fps | 97.6% |
| Lovex S070 | <<locked>> | 80% | 39,001 psi | 63% | 2615 fps | 96% |
| Lovex S071 | <<locked>> | 92% | 35,331 psi | 57% | 2566 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 49,835 psi | 80% | 2835 fps | 100% |
| Norma 204 | <<locked>> | 86% | 45,368 psi | 73% | 2785 fps | 95.7% |
| Norma MRP | 69.8 gr | 88% | 38,363 psi | 62% | 2730 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 37,608 psi | 60% | 2635 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 80% | 50,053 psi | 80% | 2854 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 46,383 psi | 74% | 2877 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 36,521 psi | 59% | 2618 fps | 95.9% |
| Ramshot Magnum | <<locked>> | 96% | 41,336 psi | 66% | 2753 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,789 psi | 45% | 1673 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,877 psi | 77% | 2782 fps | 98.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,512 psi | 71% | 2835 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,623 psi | 60% | 2657 fps | 97.7% |
| ReloadSwiss RS 70 | 64.7 gr | 80% | 36,419 psi | 58% | 2661 fps | 97% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,189 psi | 61% | 2753 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 51,155 psi | 82% | 2799 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,773 psi | 72% | 2733 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 49,342 psi | 79% | 2828 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 90% | 43,453 psi | 70% | 2769 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 41,945 psi | 67% | 2661 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,857 psi | 66% | 2638 fps | 97.6% |
| Shooters World Precision | <<locked>> | 80% | 49,284 psi | 79% | 2782 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,001 psi | 63% | 2615 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,035 psi | 74% | 2789 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,093 psi | 74% | 2644 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,914 psi | 64% | 2582 fps | 96.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 43,062 psi | 69% | 2762 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 45,194 psi | 72% | 2736 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 50,865 psi | 82% | 2822 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 34,026 psi | 55% | 2589 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 41,321 psi | 66% | 2694 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 80% | 51,503 psi | 83% | 2759 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,532 psi | 83% | 2772 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,047 psi | 69% | 2661 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,059 psi | 63% | 2635 fps | 98.2% |
| Vihtavuori N165 | <<locked>> | 92% | 40,596 psi | 65% | 2671 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 49,893 psi | 80% | 2766 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,508 psi | 62% | 2635 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 29,834 psi | 48% | 2474 fps | 95.9% |
| Vihtavuori N560 | <<locked>> | 96% | 50,923 psi | 82% | 2969 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,145 psi | 61% | 2602 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 39,856 psi | 64% | 2687 fps | 96.1% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,498 psi | 41% | 2418 fps | 95.2% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,540 psi | 70% | 2736 fps | 95.3% |
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 94 powders for .300 Win. Mag. loaded with the .308 | 170gr | Geco PLUS. Alliant Reloder-26 delivers the highest muzzle velocity at 3,094 fps; across all powders the maximum-charge window runs from 1,827 fps to 3,094 fps. Accurate 3100 gives the best case fill at 100 %, and 94 of the 94 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.308" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2217 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. Alliant Reloder-26, Norma MRP, ReloadSwiss RS 70 rank at the top here: for .300 Win. Mag. with the .308 | 170gr | Geco PLUS they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, ADI AR 2225, Baschieri & Pellagri 109 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.