Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 165gr | Swift A-Frame bullet and 72 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Norma MRP 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 56,043 psi | 88% | 3054 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 57,174 psi | 90% | 3094 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 54,578 psi | 86% | 3143 fps | 97% |
| ADI AR 2209 | <<locked>> | 90% | 54,273 psi | 85% | 3087 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 94% | 55,724 psi | 87% | 3150 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,154 psi | 79% | 3038 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,759 psi | 70% | 2989 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,302 psi | 85% | 3094 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,332 psi | 87% | 3107 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,435 psi | 90% | 3136 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,782 psi | 87% | 3143 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 57,087 psi | 89% | 3120 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,550 psi | 89% | 3182 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 53,534 psi | 84% | 3146 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 54,969 psi | 86% | 3127 fps | 98.9% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,533 psi | 82% | 3110 fps | 98.1% |
| Bofors RP5 | <<locked>> | 94% | 55,782 psi | 87% | 3143 fps | 99.1% |
| Bofors RP7 | <<locked>> | 84% | 55,724 psi | 87% | 3035 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,317 psi | 87% | 3133 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 84% | 55,085 psi | 86% | 3087 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 84% | 57,653 psi | 90% | 3104 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 92% | 55,651 psi | 87% | 3084 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,476 psi | 85% | 3064 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,665 psi | 86% | 3015 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,390 psi | 87% | 3251 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 84% | 55,637 psi | 87% | 3123 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,086 psi | 58% | 1959 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,348 psi | 90% | 3074 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,130 psi | 90% | 3061 fps | 99.8% |
| IMR 4831 | <<locked>> | 88% | 57,363 psi | 90% | 3081 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,536 psi | 89% | 3068 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 96% | 57,406 psi | 90% | 3189 fps | 98.5% |
| Lovex S065 | <<locked>> | 84% | 54,331 psi | 85% | 3005 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,985 psi | 88% | 3051 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 57,043 psi | 89% | 3071 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,737 psi | 86% | 3071 fps | 98.7% |
| Norma 217ᴾ | <<locked>> | 100% | 40,422 psi | 63% | 2907 fps | 97.1% |
| Norma MRP | <<locked>> | 92% | 55,651 psi | 87% | 3166 fps | 99.8% |
| Norma URP | <<locked>> | 86% | 55,434 psi | 87% | 3071 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,259 psi | 85% | 3143 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 86% | 54,331 psi | 85% | 3074 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 98% | 56,927 psi | 89% | 3140 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,898 psi | 59% | 2005 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 57,145 psi | 90% | 3114 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,492 psi | 87% | 3143 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,420 psi | 88% | 3251 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,213 psi | 80% | 3117 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 82% | 57,043 psi | 89% | 3038 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,347 psi | 87% | 3054 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 92% | 57,087 psi | 89% | 3127 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 84% | 55,724 psi | 87% | 3035 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,331 psi | 85% | 3005 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,985 psi | 88% | 3051 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,724 psi | 89% | 2907 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,145 psi | 90% | 3012 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,652 psi | 89% | 3120 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 56,681 psi | 89% | 3031 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 57,029 psi | 89% | 3048 fps | 97.8% |
| Somchem S365 | <<locked>> | 88% | 55,999 psi | 88% | 3074 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,435 psi | 90% | 3094 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 54,302 psi | 85% | 2949 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,276 psi | 90% | 3068 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 57,000 psi | 89% | 3071 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 86% | 56,376 psi | 88% | 3068 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,608 psi | 87% | 3094 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,448 psi | 87% | 3159 fps | 97.7% |
| Vihtavuori N565 | <<locked>> | 98% | 55,492 psi | 87% | 3136 fps | 98% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,373 psi | 82% | 3127 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,855 psi | 89% | 3022 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,274 psi | 87% | 3091 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,129 psi | 86% | 3202 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,609 psi | 90% | 3091 fps | 99.2% |
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% | 34,809 psi | 55% | 2635 fps | 96.5% |
| Accurate 4350 | <<locked>> | 80% | 46,586 psi | 73% | 2910 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 47,442 psi | 74% | 3005 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 82% | 41,423 psi | 65% | 2831 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 88% | 45,469 psi | 71% | 2949 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 96% | 43,801 psi | 69% | 2904 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 92% | 34,447 psi | 54% | 2723 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,425 psi | 70% | 2917 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,474 psi | 81% | 3045 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,827 psi | 61% | 2762 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 84% | 39,813 psi | 62% | 2825 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,388 psi | 52% | 2664 fps | 99.1% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,980 psi | 49% | 2618 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,637 psi | 57% | 2805 fps | 98.4% |
| Bofors RP15 | <<locked>> | 86% | 39,436 psi | 62% | 2815 fps | 95.2% |
| Bofors RP30 | <<locked>> | 94% | 42,714 psi | 67% | 2917 fps | 95.6% |
| Bofors RP5 | <<locked>> | 84% | 39,813 psi | 62% | 2825 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 49,066 psi | 77% | 2917 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 92% | 41,843 psi | 66% | 2864 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 48,095 psi | 75% | 2963 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 80% | 50,633 psi | 79% | 2979 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 86% | 45,368 psi | 71% | 2890 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 88% | 47,688 psi | 75% | 2940 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,090 psi | 66% | 2799 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 39,508 psi | 62% | 2904 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 47,877 psi | 75% | 2982 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,775 psi | 44% | 1755 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,556 psi | 70% | 2841 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,444 psi | 79% | 2943 fps | 99.2% |
| IMR 4831 | <<locked>> | 80% | 44,222 psi | 69% | 2851 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 86% | 46,905 psi | 74% | 2890 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 88% | 43,642 psi | 68% | 2920 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 48,080 psi | 75% | 2894 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 46,412 psi | 73% | 2881 fps | 98.8% |
| Lovex S071 | <<locked>> | 82% | 31,952 psi | 50% | 2559 fps | 95.2% |
| Norma 204 | <<locked>> | 80% | 44,556 psi | 70% | 2877 fps | 96.7% |
| Norma 217 | <<locked>> | 98% | 37,681 psi | 59% | 2838 fps | 96% |
| Norma MRP | 78 gr | 80% | 36,230 psi | 57% | 2762 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 45,600 psi | 71% | 2900 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 43,555 psi | 68% | 2933 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 44,411 psi | 70% | 2887 fps | 98.9% |
| Ramshot Magnum | <<locked>> | 86% | 36,332 psi | 57% | 2733 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,413 psi | 45% | 1795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,586 psi | 73% | 2933 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,744 psi | 70% | 2946 fps | 99.7% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 36,303 psi | 57% | 2808 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 47,485 psi | 74% | 3045 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 53,548 psi | 84% | 2982 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 42,888 psi | 67% | 2812 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 82% | 40,828 psi | 64% | 2812 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 49,066 psi | 77% | 2917 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,080 psi | 75% | 2894 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 46,412 psi | 73% | 2881 fps | 98.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,287 psi | 84% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,065 psi | 74% | 2838 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 40,480 psi | 63% | 2805 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 53,287 psi | 84% | 2979 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 46,644 psi | 73% | 2861 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 42,670 psi | 67% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,725 psi | 61% | 2733 fps | 96.1% |
| Vihtavuori N150 | <<locked>> | 80% | 51,024 psi | 80% | 2897 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,021 psi | 74% | 2894 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 38,319 psi | 60% | 2717 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 46,383 psi | 73% | 2894 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 37,391 psi | 59% | 2746 fps | 99.1% |
| Vihtavuori N560 | 83.9 gr | 86% | 45,034 psi | 71% | 2956 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 92% | 45,136 psi | 71% | 2936 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 98% | 48,646 psi | 76% | 3054 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,209 psi | 72% | 2851 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,269 psi | 76% | 2963 fps | 98.9% |
| Winchester StaBALL HD | 77.2 gr | 80% | 29,646 psi | 46% | 2664 fps | 99.1% |
| Winchester Supreme 780 | <<locked>> | 84% | 40,625 psi | 64% | 2776 fps | 95.7% |
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 77 powders for .300 Norma Mag. loaded with the .308 | 165gr | Swift A-Frame. Hodgdon Retumbo delivers the highest muzzle velocity at 3,251 fps; across all powders the maximum-charge window runs from 1,959 fps to 3,251 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 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 1:14.5 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. Winchester StaBALL HD, Norma MRP, Vihtavuori N560 rank at the top here: for .300 Norma Mag. with the .308 | 165gr | 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 8133 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.