Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 178gr | Remington SP Extended-Range bullet and 70 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Vihtavuori N560.
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 3100 | <<locked>> | 92% | 55,695 psi | 87% | 2953 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,608 psi | 89% | 2979 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 54,273 psi | 85% | 3041 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 90% | 57,479 psi | 90% | 3041 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 92% | 55,288 psi | 87% | 3048 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,447 psi | 84% | 3009 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,906 psi | 75% | 2966 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,580 psi | 90% | 3038 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,898 psi | 89% | 3028 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,535 psi | 87% | 3041 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,116 psi | 90% | 3015 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,565 psi | 89% | 3077 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,653 psi | 90% | 3104 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,782 psi | 89% | 3005 fps | 96.6% |
| Bofors RP15 | <<locked>> | 94% | 54,723 psi | 86% | 3028 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,391 psi | 88% | 3081 fps | 99.3% |
| Bofors RP5 | <<locked>> | 92% | 55,535 psi | 87% | 3041 fps | 99.5% |
| Bofors RP7 | <<locked>> | 82% | 54,766 psi | 86% | 2923 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 98% | 54,940 psi | 86% | 3035 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 82% | 54,549 psi | 85% | 2979 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 56,869 psi | 89% | 2992 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 90% | 55,071 psi | 86% | 2982 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,682 psi | 90% | 3025 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,273 psi | 85% | 2907 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,448 psi | 87% | 3156 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,940 psi | 86% | 3012 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,304 psi | 58% | 1896 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,739 psi | 89% | 2966 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,130 psi | 88% | 2946 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 57,014 psi | 89% | 2972 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,956 psi | 88% | 2966 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 57,319 psi | 90% | 3087 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,511 psi | 68% | 2864 fps | 96.6% |
| Lovex S065 | <<locked>> | 84% | 57,014 psi | 89% | 2946 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,419 psi | 87% | 2946 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,927 psi | 89% | 2972 fps | 100% |
| Norma 204 | <<locked>> | 84% | 54,114 psi | 85% | 2966 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 43,816 psi | 69% | 2894 fps | 98.8% |
| Norma MRP | <<locked>> | 90% | 55,564 psi | 87% | 3064 fps | 100% |
| Norma URP | <<locked>> | 84% | 54,998 psi | 86% | 2963 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 54,172 psi | 85% | 3048 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 86% | 57,479 psi | 90% | 3022 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,681 psi | 89% | 3038 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,159 psi | 60% | 1939 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,782 psi | 89% | 3005 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,042 psi | 86% | 3031 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,376 psi | 88% | 3153 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,535 psi | 87% | 3100 fps | 98.2% |
| Rottweil R 904 | <<locked>> | 88% | 54,795 psi | 86% | 2953 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 90% | 56,579 psi | 89% | 3018 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 82% | 54,766 psi | 86% | 2923 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,014 psi | 89% | 2946 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,419 psi | 87% | 2946 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,159 psi | 88% | 2900 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,159 psi | 88% | 3015 fps | 99.6% |
| Somchem S361 | <<locked>> | 88% | 56,246 psi | 88% | 2946 fps | 98.3% |
| Somchem S365 | <<locked>> | 86% | 55,840 psi | 88% | 2969 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,159 psi | 90% | 2995 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 57,029 psi | 89% | 2887 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,579 psi | 89% | 2953 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,768 psi | 89% | 2972 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 55,767 psi | 87% | 2959 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,564 psi | 87% | 2989 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,259 psi | 87% | 3058 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 96% | 55,477 psi | 87% | 3041 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,434 psi | 88% | 3104 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,115 psi | 88% | 2907 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,549 psi | 85% | 2979 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,521 psi | 87% | 3097 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,043 psi | 89% | 2989 fps | 99.6% |
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 3100 | <<locked>> | 80% | 37,188 psi | 58% | 2608 fps | 98% |
| Accurate 4350 | <<locked>> | 80% | 49,487 psi | 78% | 2867 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 43,976 psi | 69% | 2841 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 41,147 psi | 64% | 2740 fps | 96.7% |
| ADI AR 2213 | <<locked>> | 84% | 42,105 psi | 66% | 2789 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 92% | 40,770 psi | 64% | 2756 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 88% | 32,242 psi | 51% | 2582 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,195 psi | 74% | 2871 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,162 psi | 65% | 2730 fps | 96.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,043 psi | 58% | 2671 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,795 psi | 56% | 2631 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,995 psi | 49% | 2539 fps | 96.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,624 psi | 62% | 2782 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,316 psi | 84% | 2946 fps | 95.8% |
| Bofors RP15 | <<locked>> | 82% | 36,840 psi | 58% | 2661 fps | 95.1% |
| Bofors RP30 | <<locked>> | 90% | 40,045 psi | 63% | 2766 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 37,043 psi | 58% | 2671 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 51,488 psi | 81% | 2867 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 38,943 psi | 61% | 2713 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 50,879 psi | 80% | 2917 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 53,287 psi | 84% | 2933 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 84% | 44,947 psi | 70% | 2795 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 84% | 44,135 psi | 69% | 2779 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,672 psi | 70% | 2749 fps | 100% |
| Hodgdon Retumbo | 80.8 gr | 86% | 36,927 psi | 58% | 2753 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 50,966 psi | 80% | 2946 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,963 psi | 44% | 1693 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,920 psi | 74% | 2799 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,837 psi | 83% | 2894 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 46,862 psi | 73% | 2808 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 43,395 psi | 68% | 2733 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 84% | 40,654 psi | 64% | 2766 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,538 psi | 64% | 2799 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 50,488 psi | 79% | 2841 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,863 psi | 77% | 2831 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 31,981 psi | 50% | 2477 fps | 96.2% |
| Norma 204 | <<locked>> | 80% | 47,137 psi | 74% | 2838 fps | 98.1% |
| Norma 217 | <<locked>> | 92% | 33,286 psi | 52% | 2638 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 38,885 psi | 61% | 2740 fps | 97.5% |
| Norma URP | <<locked>> | 80% | 48,269 psi | 76% | 2851 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 40,466 psi | 63% | 2776 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 47,065 psi | 74% | 2848 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 84% | 36,172 psi | 57% | 2648 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,645 psi | 45% | 1736 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,545 psi | 78% | 2887 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,718 psi | 75% | 2907 fps | 100% |
| ReloadSwiss RS 76 | 84.5 gr | 84% | 33,721 psi | 53% | 2654 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,034 psi | 69% | 2884 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 42,308 psi | 66% | 2713 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 40,553 psi | 64% | 2717 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 80% | 51,488 psi | 81% | 2867 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,488 psi | 79% | 2841 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,863 psi | 77% | 2831 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,400 psi | 77% | 2789 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,219 psi | 63% | 2713 fps | 96.6% |
| Somchem S361 | <<locked>> | 80% | 43,178 psi | 68% | 2703 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 45,556 psi | 71% | 2805 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,104 psi | 64% | 2700 fps | 97.7% |
| Vihtavuori N150 | <<locked>> | 80% | 53,606 psi | 84% | 2838 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,690 psi | 78% | 2844 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,694 psi | 56% | 2569 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 48,994 psi | 77% | 2848 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,987 psi | 63% | 2710 fps | 99.8% |
| Vihtavuori N560 | 80 gr | 82% | 41,829 psi | 66% | 2795 fps | 95% |
| Vihtavuori N565 | <<locked>> | 88% | 42,250 psi | 66% | 2789 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 94% | 45,411 psi | 71% | 2900 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,892 psi | 77% | 2802 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,068 psi | 80% | 2920 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,169 psi | 50% | 2654 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,637 psi | 59% | 2621 fps | 95.6% |
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 70 powders for .300 Norma Mag. loaded with the .308 | 178gr | Remington SP Extended-Range. Hodgdon Retumbo delivers the highest muzzle velocity at 3,156 fps; across all powders the maximum-charge window runs from 1,896 fps to 3,156 fps. ADI AR 2217 gives the best case fill at 100 %, and 70 of the 70 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 178.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Bofors RP30 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. Hodgdon Retumbo, ReloadSwiss RS 76, Vihtavuori N560 rank at the top here: for .300 Norma Mag. with the .308 | 178gr | Remington SP Extended-Range 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.