Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 165gr | Sierra GameKing bullet and 72 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 Hodgdon Retumbo.
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 2700 | <<locked>> | 82% | 56,898 psi | 89% | 3018 fps | 99.6% |
| Accurate 3100 | <<locked>> | 94% | 56,985 psi | 89% | 3077 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,244 psi | 85% | 3054 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 56,608 psi | 89% | 3179 fps | 96.9% |
| ADI AR 2209 | <<locked>> | 90% | 55,216 psi | 87% | 3110 fps | 99% |
| ADI AR 2213 | <<locked>> | 94% | 56,797 psi | 89% | 3179 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,053 psi | 80% | 3064 fps | 97.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,614 psi | 71% | 3015 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,230 psi | 87% | 3117 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,231 psi | 88% | 3127 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,708 psi | 86% | 3097 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,869 psi | 89% | 3173 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 94% | 54,491 psi | 85% | 3087 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,667 psi | 90% | 3205 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 54,766 psi | 86% | 3173 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 55,840 psi | 88% | 3153 fps | 99.1% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,577 psi | 84% | 3140 fps | 98.5% |
| Bofors RP5 | <<locked>> | 94% | 56,869 psi | 89% | 3173 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 56,521 psi | 89% | 3058 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,260 psi | 88% | 3159 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 84% | 55,912 psi | 88% | 3110 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 82% | 54,868 psi | 86% | 3068 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 92% | 56,521 psi | 89% | 3110 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,521 psi | 87% | 3094 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,521 psi | 87% | 3038 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,463 psi | 88% | 3281 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 56,536 psi | 89% | 3150 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,159 psi | 58% | 1972 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,679 psi | 86% | 3041 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,173 psi | 88% | 3041 fps | 99.7% |
| IMR 4831 | <<locked>> | 86% | 54,708 psi | 86% | 3051 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,564 psi | 87% | 3048 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 94% | 54,650 psi | 86% | 3150 fps | 98.2% |
| Lovex S065 | <<locked>> | 84% | 55,085 psi | 86% | 3025 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,739 psi | 89% | 3074 fps | 99.9% |
| Lovex S071 | <<locked>> | 98% | 54,607 psi | 86% | 3041 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,651 psi | 87% | 3094 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 41,350 psi | 65% | 2936 fps | 97.6% |
| Norma MRP | <<locked>> | 92% | 56,797 psi | 89% | 3192 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 56,246 psi | 88% | 3094 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,405 psi | 87% | 3173 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 86% | 55,288 psi | 87% | 3097 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 53,954 psi | 85% | 3104 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,971 psi | 60% | 2014 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,288 psi | 85% | 3074 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,681 psi | 89% | 3169 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 57,609 psi | 90% | 3278 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 52,591 psi | 82% | 3153 fps | 97% |
| Rottweil R 904 | <<locked>> | 90% | 56,202 psi | 88% | 3081 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 90% | 54,302 psi | 85% | 3091 fps | 99% |
| Rottweil R 907 | <<locked>> | 84% | 56,521 psi | 89% | 3058 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,085 psi | 86% | 3025 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,013 psi | 86% | 3031 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,377 psi | 90% | 2923 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,302 psi | 85% | 2976 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,332 psi | 87% | 3097 fps | 99% |
| Somchem S355 | <<locked>> | 82% | 57,348 psi | 90% | 3051 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 54,288 psi | 85% | 3012 fps | 97.4% |
| Somchem S365 | <<locked>> | 88% | 57,087 psi | 89% | 3100 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,882 psi | 86% | 3061 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 82% | 55,158 psi | 86% | 2969 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,418 psi | 85% | 3031 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 54,389 psi | 85% | 3038 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 86% | 57,319 psi | 90% | 3091 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,623 psi | 89% | 3117 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,536 psi | 89% | 3186 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 98% | 56,724 psi | 89% | 3166 fps | 98.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 53,563 psi | 84% | 3159 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,740 psi | 90% | 3041 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,101 psi | 88% | 3114 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 56,521 psi | 89% | 3232 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,636 psi | 86% | 3054 fps | 99% |
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% | 53,243 psi | 83% | 2956 fps | 99.3% |
| Accurate 3100 | <<locked>> | 80% | 35,375 psi | 55% | 2654 fps | 96.8% |
| Accurate 4350 | <<locked>> | 80% | 47,297 psi | 74% | 2933 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 49,023 psi | 77% | 3038 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 39,349 psi | 62% | 2792 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 86% | 43,105 psi | 68% | 2907 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 94% | 41,713 psi | 65% | 2867 fps | 95% |
| ADI AR 2225 | <<locked>> | 92% | 35,056 psi | 55% | 2753 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,295 psi | 71% | 2943 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,562 psi | 82% | 3071 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,407 psi | 62% | 2785 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 84% | 40,538 psi | 64% | 2851 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,026 psi | 53% | 2687 fps | 99.3% |
| Alliant Reloder-25 | <<locked>> | 82% | 31,589 psi | 50% | 2644 fps | 96% |
| Alliant Reloder-26 | 81.6 gr | 80% | 37,391 psi | 59% | 2828 fps | 98.7% |
| Bofors RP15 | <<locked>> | 86% | 40,161 psi | 63% | 2838 fps | 95.6% |
| Bofors RP30 | <<locked>> | 92% | 40,640 psi | 64% | 2877 fps | 95.1% |
| Bofors RP5 | <<locked>> | 84% | 40,538 psi | 64% | 2851 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 49,705 psi | 78% | 2940 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 90% | 39,914 psi | 63% | 2828 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 48,878 psi | 77% | 2986 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 80% | 51,416 psi | 81% | 3005 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 86% | 46,224 psi | 72% | 2920 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,223 psi | 71% | 2897 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,757 psi | 67% | 2818 fps | 100% |
| Hodgdon Retumbo | 84 gr | 88% | 37,681 psi | 59% | 2861 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 48,776 psi | 76% | 3009 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,833 psi | 44% | 1765 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,136 psi | 71% | 2864 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,617 psi | 78% | 2927 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 44,889 psi | 70% | 2874 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 86% | 45,948 psi | 72% | 2867 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 88% | 44,512 psi | 70% | 2953 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 48,675 psi | 76% | 2913 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 47,007 psi | 74% | 2900 fps | 99% |
| Lovex S071 | <<locked>> | 82% | 32,561 psi | 51% | 2582 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 45,310 psi | 71% | 2904 fps | 97% |
| Norma 217 | <<locked>> | 96% | 36,013 psi | 56% | 2802 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 36,956 psi | 58% | 2789 fps | 96.1% |
| Norma URP | <<locked>> | 80% | 46,296 psi | 73% | 2920 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 41,394 psi | 65% | 2890 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 45,179 psi | 71% | 2913 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 37,057 psi | 58% | 2759 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,471 psi | 45% | 1804 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,398 psi | 74% | 2956 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,556 psi | 71% | 2972 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 34,432 psi | 54% | 2762 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 48,573 psi | 76% | 3074 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 82% | 43,424 psi | 68% | 2835 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 80% | 38,856 psi | 61% | 2776 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 49,705 psi | 78% | 2940 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,675 psi | 76% | 2913 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 45,571 psi | 71% | 2861 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,983 psi | 85% | 2874 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,659 psi | 75% | 2858 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 39,566 psi | 62% | 2782 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 53,983 psi | 85% | 2999 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 44,367 psi | 70% | 2825 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 43,381 psi | 68% | 2871 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,436 psi | 62% | 2756 fps | 96.5% |
| Vihtavuori N150 | <<locked>> | 80% | 51,692 psi | 81% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,688 psi | 75% | 2917 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 82% | 36,448 psi | 57% | 2677 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 47,166 psi | 74% | 2920 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 38,203 psi | 60% | 2772 fps | 99.3% |
| Vihtavuori N560 | <<locked>> | 86% | 45,919 psi | 72% | 2982 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 90% | 43,134 psi | 68% | 2904 fps | 95% |
| Vihtavuori N568 | <<locked>> | 98% | 49,748 psi | 78% | 3087 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,905 psi | 74% | 2871 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,052 psi | 77% | 2989 fps | 99.2% |
| Winchester StaBALL HD | 78.4 gr | 80% | 30,269 psi | 47% | 2694 fps | 99.4% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,566 psi | 60% | 2736 fps | 95.1% |
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 78 powders for .300 Norma Mag. loaded with the .308 | 165gr | Sierra GameKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,281 fps; across all powders the maximum-charge window runs from 1,972 fps to 3,281 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 1:14.0 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, Hodgdon Retumbo rank at the top here: for .300 Norma Mag. with the .308 | 165gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 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.