Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 181gr | RWS H-Mantel bullet and 73 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 Winchester StaBALL HD.
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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 54,418 psi | 85% | 2907 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,579 psi | 87% | 2940 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 55,854 psi | 88% | 3054 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 92% | 56,782 psi | 89% | 3058 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 90% | 56,159 psi | 88% | 2995 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 92% | 54,114 psi | 85% | 3002 fps | 98.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,170 psi | 82% | 2963 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,601 psi | 73% | 2917 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,507 psi | 89% | 2992 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,333 psi | 88% | 2992 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,595 psi | 90% | 3005 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,825 psi | 87% | 2986 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 92% | 54,288 psi | 85% | 2995 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,753 psi | 87% | 2972 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,042 psi | 86% | 3031 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,188 psi | 88% | 3058 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,579 psi | 87% | 2959 fps | 96.3% |
| Bofors RP15 | <<locked>> | 96% | 57,130 psi | 90% | 3041 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,737 psi | 86% | 3031 fps | 99.1% |
| Bofors RP5 | <<locked>> | 92% | 54,288 psi | 85% | 2995 fps | 99.4% |
| Bofors RP7 | <<locked>> | 84% | 57,334 psi | 90% | 2936 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,479 psi | 90% | 3051 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 56,942 psi | 89% | 2992 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 55,738 psi | 87% | 2946 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 57,609 psi | 90% | 2999 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,521 psi | 89% | 2979 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,724 psi | 89% | 2917 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 53,983 psi | 85% | 3104 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 57,711 psi | 90% | 3031 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,231 psi | 58% | 1867 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,579 psi | 87% | 2923 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,376 psi | 87% | 2907 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 55,883 psi | 88% | 2930 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 54,810 psi | 86% | 2920 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 94% | 55,883 psi | 88% | 3038 fps | 98.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,206 psi | 66% | 2815 fps | 96.3% |
| Lovex S065 | <<locked>> | 84% | 56,057 psi | 88% | 2904 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 54,317 psi | 85% | 2900 fps | 99.9% |
| Lovex S071 | <<locked>> | 98% | 55,651 psi | 87% | 2927 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,724 psi | 89% | 2982 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 42,467 psi | 67% | 2844 fps | 98.5% |
| Norma MRP | <<locked>> | 90% | 54,114 psi | 85% | 3015 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 57,406 psi | 90% | 2972 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,811 psi | 89% | 3064 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 56,347 psi | 88% | 2982 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,042 psi | 86% | 2992 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,116 psi | 60% | 1913 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,535 psi | 87% | 2963 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 53,795 psi | 84% | 2986 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,737 psi | 86% | 3100 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,722 psi | 84% | 3048 fps | 97.9% |
| Rottweil R 904 | <<locked>> | 90% | 57,246 psi | 90% | 2966 fps | 99% |
| Rottweil R 905 | <<locked>> | 90% | 55,463 psi | 87% | 2976 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 84% | 57,334 psi | 90% | 2936 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,057 psi | 88% | 2904 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 54,317 psi | 85% | 2900 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,187 psi | 86% | 2858 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,042 psi | 86% | 2972 fps | 99.5% |
| Somchem S361 | <<locked>> | 88% | 55,245 psi | 87% | 2900 fps | 98.1% |
| Somchem S365 | <<locked>> | 86% | 54,433 psi | 85% | 2923 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,927 psi | 88% | 2949 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 56,028 psi | 88% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,637 psi | 87% | 2913 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,448 psi | 87% | 2927 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 84% | 54,766 psi | 86% | 2917 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 54,302 psi | 85% | 2946 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,740 psi | 90% | 3074 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 98% | 57,740 psi | 90% | 3054 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,766 psi | 86% | 3051 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,882 psi | 86% | 2867 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,145 psi | 90% | 2992 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 53,882 psi | 84% | 3051 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,724 psi | 87% | 2943 fps | 99.4% |
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% | 36,260 psi | 57% | 2566 fps | 97.8% |
| Accurate 4350 | <<locked>> | 80% | 48,385 psi | 76% | 2822 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 39,421 psi | 62% | 2730 fps | 95% |
| Accurate MAGPRO | <<locked>> | 86% | 46,064 psi | 72% | 2861 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 40,205 psi | 63% | 2694 fps | 96.4% |
| ADI AR 2213 | <<locked>> | 84% | 41,205 psi | 65% | 2746 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 92% | 39,813 psi | 62% | 2707 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 90% | 33,562 psi | 53% | 2602 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,654 psi | 64% | 2697 fps | 96.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,209 psi | 72% | 2828 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,664 psi | 84% | 2949 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,277 psi | 63% | 2690 fps | 96.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,143 psi | 57% | 2628 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,940 psi | 55% | 2592 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,240 psi | 47% | 2497 fps | 96.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,537 psi | 60% | 2740 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,243 psi | 82% | 2900 fps | 95.5% |
| Bofors RP15 | <<locked>> | 84% | 38,493 psi | 60% | 2684 fps | 95.9% |
| Bofors RP30 | <<locked>> | 90% | 39,001 psi | 61% | 2723 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 36,143 psi | 57% | 2628 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 50,676 psi | 79% | 2828 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 38,101 psi | 60% | 2671 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 49,879 psi | 78% | 2874 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 52,301 psi | 82% | 2887 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 44,005 psi | 69% | 2753 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 43,207 psi | 68% | 2733 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,743 psi | 69% | 2710 fps | 100% |
| Hodgdon Retumbo | 78.3 gr | 86% | 36,085 psi | 57% | 2707 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 49,821 psi | 78% | 2900 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,905 psi | 44% | 1670 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,977 psi | 72% | 2756 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,025 psi | 82% | 2851 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 46,006 psi | 72% | 2769 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,598 psi | 67% | 2690 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 86% | 42,482 psi | 67% | 2785 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 39,450 psi | 62% | 2753 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 49,661 psi | 78% | 2799 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 47,848 psi | 75% | 2789 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 31,299 psi | 49% | 2441 fps | 96% |
| Norma 204 | <<locked>> | 80% | 46,296 psi | 73% | 2799 fps | 97.9% |
| Norma 217 | <<locked>> | 94% | 34,548 psi | 54% | 2651 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 37,985 psi | 60% | 2700 fps | 97.3% |
| Norma URP | <<locked>> | 80% | 47,224 psi | 74% | 2805 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 39,407 psi | 62% | 2726 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 46,166 psi | 72% | 2805 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 35,288 psi | 55% | 2605 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,601 psi | 45% | 1709 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,414 psi | 76% | 2844 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,644 psi | 73% | 2864 fps | 100% |
| ReloadSwiss RS 76 | 81.8 gr | 84% | 32,822 psi | 51% | 2612 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 46,122 psi | 72% | 2907 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 41,553 psi | 65% | 2674 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 39,726 psi | 62% | 2674 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 80% | 50,676 psi | 79% | 2828 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,661 psi | 78% | 2799 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 47,848 psi | 75% | 2789 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,530 psi | 76% | 2746 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,407 psi | 62% | 2671 fps | 96.4% |
| Somchem S361 | <<locked>> | 80% | 42,380 psi | 66% | 2664 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 44,425 psi | 70% | 2762 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,219 psi | 63% | 2657 fps | 97.5% |
| Vihtavuori N150 | <<locked>> | 80% | 52,562 psi | 82% | 2795 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,689 psi | 76% | 2802 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,896 psi | 55% | 2526 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 48,080 psi | 75% | 2805 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,102 psi | 61% | 2671 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 43,859 psi | 69% | 2818 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 88% | 41,104 psi | 64% | 2743 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 96% | 47,413 psi | 74% | 2920 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,819 psi | 75% | 2759 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,067 psi | 78% | 2877 fps | 99.6% |
| Winchester StaBALL HD | 74.8 gr | 80% | 31,140 psi | 49% | 2612 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,811 psi | 58% | 2579 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 73 powders for .300 Norma Mag. loaded with the .308 | 181gr | RWS H-Mantel. Hodgdon Retumbo delivers the highest muzzle velocity at 3,104 fps; across all powders the maximum-charge window runs from 1,867 fps to 3,104 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 181.0 gr projectile in 0.308" calls for a 1:14.0 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, Winchester StaBALL HD rank at the top here: for .300 Norma Mag. with the .308 | 181gr | RWS H-Mantel 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.