Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 170gr | Swift A-Frame bullet and 70 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Hodgdon Retumbo and ReloadSwiss RS 76.
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>> | 94% | 57,435 psi | 90% | 3038 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,621 psi | 86% | 3012 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 56,014 psi | 88% | 3130 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 90% | 55,521 psi | 87% | 3071 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 57,072 psi | 89% | 3133 fps | 98.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,416 psi | 81% | 3028 fps | 98% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,963 psi | 72% | 2979 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,579 psi | 87% | 3071 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,681 psi | 89% | 3084 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,998 psi | 86% | 3058 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 94% | 57,174 psi | 90% | 3127 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 94% | 54,911 psi | 86% | 3048 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 54,215 psi | 85% | 3104 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,143 psi | 86% | 3130 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 56,333 psi | 88% | 3110 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,027 psi | 85% | 3100 fps | 98.6% |
| Bofors RP5 | <<locked>> | 94% | 57,174 psi | 90% | 3127 fps | 99.4% |
| Bofors RP7 | <<locked>> | 84% | 56,782 psi | 89% | 3015 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,724 psi | 89% | 3120 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 84% | 56,289 psi | 88% | 3068 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 55,158 psi | 86% | 3022 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 56,913 psi | 89% | 3068 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,724 psi | 87% | 3051 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,898 psi | 88% | 2995 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,942 psi | 89% | 3241 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 57,014 psi | 89% | 3107 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,173 psi | 58% | 1936 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,027 psi | 86% | 3002 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 82% | 54,578 psi | 86% | 2979 fps | 99.7% |
| IMR 4831 | <<locked>> | 86% | 55,114 psi | 86% | 3005 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,667 psi | 90% | 3051 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 94% | 55,100 psi | 86% | 3110 fps | 98.4% |
| Lovex S065 | <<locked>> | 84% | 55,376 psi | 87% | 2982 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,101 psi | 89% | 3031 fps | 99.9% |
| Lovex S071 | <<locked>> | 98% | 54,824 psi | 86% | 2999 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,927 psi | 88% | 3054 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 41,713 psi | 65% | 2900 fps | 97.8% |
| Norma MRP | <<locked>> | 92% | 57,130 psi | 90% | 3150 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 56,652 psi | 89% | 3051 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,782 psi | 87% | 3133 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 86% | 55,550 psi | 87% | 3054 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 54,215 psi | 85% | 3061 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,000 psi | 60% | 1978 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,766 psi | 86% | 3035 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,913 psi | 89% | 3120 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 53,882 psi | 84% | 3169 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 52,852 psi | 83% | 3110 fps | 97.2% |
| Rottweil R 904 | <<locked>> | 90% | 56,492 psi | 89% | 3038 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 90% | 54,592 psi | 86% | 3045 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 84% | 56,782 psi | 89% | 3015 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,376 psi | 87% | 2982 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,101 psi | 89% | 3031 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,696 psi | 90% | 2881 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,534 psi | 85% | 2930 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 54,172 psi | 85% | 3041 fps | 99.1% |
| Somchem S361 | <<locked>> | 88% | 54,491 psi | 85% | 2969 fps | 97.6% |
| Somchem S365 | <<locked>> | 88% | 57,392 psi | 90% | 3054 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,230 psi | 87% | 3018 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 82% | 55,361 psi | 87% | 2927 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,766 psi | 86% | 2989 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 54,781 psi | 86% | 2999 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 86% | 57,566 psi | 90% | 3048 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,000 psi | 89% | 3074 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,855 psi | 89% | 3143 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 98% | 56,985 psi | 89% | 3123 fps | 98.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 53,940 psi | 85% | 3117 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,273 psi | 85% | 2943 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,492 psi | 89% | 3071 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 57,043 psi | 89% | 3189 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,056 psi | 86% | 3015 fps | 99.1% |
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% | 35,737 psi | 56% | 2625 fps | 97.1% |
| Accurate 4350 | <<locked>> | 80% | 47,703 psi | 75% | 2894 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 48,733 psi | 76% | 2992 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 39,711 psi | 62% | 2756 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 86% | 43,482 psi | 68% | 2871 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 94% | 41,901 psi | 66% | 2828 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 92% | 35,346 psi | 55% | 2720 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,498 psi | 71% | 2900 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,736 psi | 83% | 3025 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,726 psi | 62% | 2753 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,130 psi | 60% | 2749 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,301 psi | 54% | 2651 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,805 psi | 47% | 2549 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,768 psi | 59% | 2795 fps | 98.9% |
| Bofors RP15 | <<locked>> | 86% | 40,466 psi | 63% | 2802 fps | 95.9% |
| Bofors RP30 | <<locked>> | 92% | 41,017 psi | 64% | 2841 fps | 95.4% |
| Bofors RP5 | <<locked>> | 82% | 38,130 psi | 60% | 2749 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 50,009 psi | 78% | 2897 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 40,147 psi | 63% | 2792 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 49,182 psi | 77% | 2943 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 51,663 psi | 81% | 2963 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 46,441 psi | 73% | 2881 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,585 psi | 71% | 2861 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,091 psi | 68% | 2779 fps | 100% |
| Hodgdon Retumbo | 82.7 gr | 88% | 37,927 psi | 59% | 2828 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 49,081 psi | 77% | 2969 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,847 psi | 44% | 1729 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,484 psi | 71% | 2825 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,372 psi | 81% | 2923 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 45,252 psi | 71% | 2838 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,889 psi | 70% | 2815 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 86% | 41,742 psi | 65% | 2844 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 49,008 psi | 77% | 2874 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 47,369 psi | 74% | 2861 fps | 99.1% |
| Lovex S071 | <<locked>> | 80% | 30,705 psi | 48% | 2490 fps | 95.1% |
| Norma 204 | <<locked>> | 80% | 45,556 psi | 71% | 2861 fps | 97.2% |
| Norma 217 | <<locked>> | 96% | 36,347 psi | 57% | 2772 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 37,246 psi | 58% | 2756 fps | 96.4% |
| Norma URP | <<locked>> | 80% | 46,644 psi | 73% | 2881 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 41,698 psi | 65% | 2854 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 45,440 psi | 71% | 2871 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 37,347 psi | 59% | 2726 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,500 psi | 45% | 1772 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,732 psi | 75% | 2917 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,890 psi | 72% | 2933 fps | 99.9% |
| ReloadSwiss RS 76 | 86.5 gr | 86% | 34,737 psi | 54% | 2733 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 45,397 psi | 71% | 2966 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 82% | 43,801 psi | 69% | 2799 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 39,059 psi | 61% | 2736 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 50,009 psi | 78% | 2897 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,008 psi | 77% | 2874 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 47,369 psi | 74% | 2861 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,215 psi | 85% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,993 psi | 75% | 2818 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,725 psi | 61% | 2730 fps | 95.5% |
| Somchem S361 | <<locked>> | 82% | 44,730 psi | 70% | 2789 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 43,801 psi | 69% | 2835 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,639 psi | 62% | 2720 fps | 96.8% |
| Vihtavuori N150 | <<locked>> | 80% | 52,025 psi | 82% | 2874 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,066 psi | 75% | 2877 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 36,811 psi | 58% | 2644 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 47,398 psi | 74% | 2877 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 38,392 psi | 60% | 2730 fps | 99.4% |
| Vihtavuori N560 | <<locked>> | 86% | 46,224 psi | 72% | 2943 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 90% | 43,337 psi | 68% | 2867 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 98% | 50,096 psi | 79% | 3048 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,253 psi | 74% | 2831 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,356 psi | 77% | 2946 fps | 99.3% |
| Winchester StaBALL HD | 77.2 gr | 80% | 30,487 psi | 48% | 2664 fps | 99.6% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,841 psi | 61% | 2700 fps | 95.5% |
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 76 powders for .300 Norma Mag. loaded with the .308 | 170gr | Swift A-Frame. Hodgdon Retumbo delivers the highest muzzle velocity at 3,241 fps; across all powders the maximum-charge window runs from 1,936 fps to 3,241 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 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 170.0 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, Alliant Reloder-33 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. Winchester StaBALL HD, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .300 Norma Mag. with the .308 | 170gr | Swift A-Frame 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.