Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 165gr | Barnes MRX BT bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Winchester StaBALL HD and IMR 7828 SSC.
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>> | 96% | 56,840 psi | 89% | 3071 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,244 psi | 85% | 3051 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 55,709 psi | 87% | 3166 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 82% | 55,854 psi | 88% | 3022 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,622 psi | 87% | 3110 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 96% | 57,246 psi | 90% | 3176 fps | 98.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,732 psi | 75% | 2989 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,409 psi | 66% | 2936 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,116 psi | 90% | 3045 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,622 psi | 87% | 3117 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 56,840 psi | 89% | 3130 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 54,998 psi | 86% | 3097 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 96% | 57,058 psi | 89% | 3169 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 96% | 54,273 psi | 85% | 3081 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,737 psi | 84% | 3140 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 54,708 psi | 86% | 3169 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 55,941 psi | 88% | 3146 fps | 99% |
| Bofors RP30ᴾ | <<locked>> | 100% | 49,661 psi | 78% | 3061 fps | 97.4% |
| Bofors RP5 | <<locked>> | 96% | 57,058 psi | 89% | 3169 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 57,087 psi | 89% | 3058 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,794 psi | 83% | 3091 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 86% | 56,420 psi | 88% | 3110 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 55,390 psi | 87% | 3064 fps | 99% |
| Hodgdon H4831 | <<locked>> | 94% | 57,188 psi | 90% | 3110 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 94% | 55,898 psi | 88% | 3091 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,724 psi | 87% | 3035 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,634 psi | 82% | 3202 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 86% | 57,130 psi | 90% | 3150 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,927 psi | 58% | 1952 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,158 psi | 86% | 3041 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,143 psi | 86% | 3028 fps | 99.6% |
| IMR 4831 | <<locked>> | 88% | 54,766 psi | 86% | 3045 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,534 psi | 85% | 3035 fps | 97.4% |
| IMR 7828 SSC | <<locked>> | 96% | 54,868 psi | 86% | 3146 fps | 98% |
| Lovex S065 | <<locked>> | 86% | 55,506 psi | 87% | 3025 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 57,217 psi | 90% | 3074 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,085 psi | 85% | 3028 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 56,260 psi | 88% | 3097 fps | 98.9% |
| Norma MRP | <<locked>> | 94% | 56,869 psi | 89% | 3189 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 56,666 psi | 89% | 3094 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,666 psi | 87% | 3169 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 88% | 55,622 psi | 87% | 3097 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 98% | 53,809 psi | 84% | 3094 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,521 psi | 59% | 1995 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,405 psi | 88% | 3120 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,549 psi | 85% | 3074 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 56,956 psi | 89% | 3166 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,272 psi | 83% | 3199 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 82% | 54,665 psi | 86% | 3005 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 56,710 psi | 89% | 3077 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 92% | 54,462 psi | 85% | 3084 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 86% | 57,087 psi | 89% | 3058 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,506 psi | 87% | 3025 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 57,217 psi | 90% | 3074 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,289 psi | 88% | 3064 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,781 psi | 86% | 2881 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,853 psi | 86% | 2972 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 54,027 psi | 85% | 3077 fps | 98.8% |
| Somchem S355 | <<locked>> | 82% | 54,273 psi | 85% | 2995 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 54,824 psi | 86% | 3012 fps | 97.3% |
| Somchem S365 | <<locked>> | 90% | 57,174 psi | 90% | 3097 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,984 psi | 86% | 3058 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 84% | 55,738 psi | 87% | 2972 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,810 psi | 86% | 3031 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 54,563 psi | 86% | 3035 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 88% | 57,682 psi | 90% | 3091 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 56,405 psi | 88% | 3110 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 56,695 psi | 89% | 3182 fps | 97.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 56,231 psi | 88% | 3153 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,491 psi | 85% | 2989 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,608 psi | 89% | 3114 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 55,912 psi | 88% | 3219 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,955 psi | 86% | 3048 fps | 98.8% |
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% | 32,387 psi | 51% | 2575 fps | 95.3% |
| Accurate 4350 | <<locked>> | 80% | 43,932 psi | 69% | 2867 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 90% | 48,153 psi | 75% | 3022 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 52,388 psi | 82% | 2966 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 39,552 psi | 62% | 2789 fps | 95% |
| ADI AR 2213 | <<locked>> | 90% | 46,369 psi | 73% | 2972 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 98% | 44,570 psi | 70% | 2920 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 94% | 34,563 psi | 54% | 2726 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,563 psi | 84% | 2989 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,351 psi | 66% | 2874 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,066 psi | 77% | 3009 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,508 psi | 62% | 2782 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 86% | 40,292 psi | 63% | 2841 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,372 psi | 49% | 2615 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,227 psi | 49% | 2628 fps | 95.4% |
| Alliant Reloder-26 | 78.7 gr | 80% | 34,142 psi | 54% | 2743 fps | 97.5% |
| Bofors RP15 | <<locked>> | 88% | 39,914 psi | 63% | 2828 fps | 95.2% |
| Bofors RP30 | <<locked>> | 96% | 43,033 psi | 67% | 2927 fps | 95.6% |
| Bofors RP5 | <<locked>> | 86% | 40,292 psi | 63% | 2841 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 47,079 psi | 74% | 2877 fps | 98.2% |
| Hodgdon H1000 | <<locked>> | 94% | 42,627 psi | 67% | 2884 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 46,021 psi | 72% | 2923 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 80% | 48,559 psi | 76% | 2943 fps | 98% |
| Hodgdon H4831 | <<locked>> | 88% | 46,398 psi | 73% | 2913 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 48,704 psi | 76% | 2959 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,943 psi | 63% | 2759 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 39,943 psi | 63% | 2917 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 45,513 psi | 71% | 2943 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,557 psi | 43% | 1745 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,714 psi | 67% | 2805 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,646 psi | 76% | 2910 fps | 98.8% |
| IMR 4831 | <<locked>> | 80% | 42,061 psi | 66% | 2815 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 86% | 44,918 psi | 70% | 2851 fps | 95% |
| IMR 7828 SSC | 82.8 gr | 90% | 44,541 psi | 70% | 2943 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 46,035 psi | 72% | 2854 fps | 99.3% |
| Lovex S070 | <<locked>> | 80% | 44,324 psi | 69% | 2838 fps | 98.3% |
| Lovex S071 | <<locked>> | 84% | 31,749 psi | 50% | 2559 fps | 95% |
| Norma 204 | <<locked>> | 80% | 42,511 psi | 67% | 2835 fps | 95.9% |
| Norma MRP | <<locked>> | 82% | 36,637 psi | 57% | 2779 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 43,497 psi | 68% | 2858 fps | 99.6% |
| Ramshot Grand | <<locked>> | 90% | 44,469 psi | 70% | 2953 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 42,279 psi | 66% | 2848 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 88% | 36,637 psi | 57% | 2743 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,152 psi | 44% | 1788 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,199 psi | 82% | 3058 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,164 psi | 69% | 2890 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,453 psi | 67% | 2900 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 36,709 psi | 58% | 2825 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 51,155 psi | 80% | 2949 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 43,685 psi | 68% | 2831 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 82% | 38,653 psi | 61% | 2766 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 47,079 psi | 74% | 2877 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,035 psi | 72% | 2854 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 80% | 44,324 psi | 69% | 2838 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,620 psi | 82% | 3009 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,503 psi | 81% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,976 psi | 70% | 2799 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 41,046 psi | 64% | 2822 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 51,097 psi | 80% | 2946 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 47,848 psi | 75% | 2884 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 40,350 psi | 63% | 2812 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,550 psi | 57% | 2684 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 48,936 psi | 77% | 2867 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,802 psi | 70% | 2854 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 38,812 psi | 61% | 2730 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 44,164 psi | 69% | 2854 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 35,056 psi | 55% | 2694 fps | 98.4% |
| Vihtavuori N560 | <<locked>> | 88% | 45,890 psi | 72% | 2976 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 94% | 45,643 psi | 72% | 2953 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,048 psi | 69% | 2815 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,021 psi | 72% | 2923 fps | 98.5% |
| Winchester StaBALL HD | 75.6 gr | 80% | 27,659 psi | 43% | 2598 fps | 98.1% |
| Winchester Supreme 780 | <<locked>> | 86% | 41,336 psi | 65% | 2792 fps | 95.8% |
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 | 165gr | Barnes MRX BT. Winchester StaBALL HD delivers the highest muzzle velocity at 3,219 fps; across all powders the maximum-charge window runs from 1,952 fps to 3,219 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 165.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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, Winchester StaBALL HD, IMR 7828 SSC rank at the top here: for .300 Norma Mag. with the .308 | 165gr | Barnes MRX 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.