Load Specifications
Load data in caliber 7-.300 Norma Mag. with .284 | 173gr | Sellier & Bellot SPCE bullet and 50 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 54,897 psi | 86% | 2864 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 50,082 psi | 78% | 2904 fps | 97.7% |
| Accurate MAGPRO | <<locked>> | 82% | 53,954 psi | 85% | 2976 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 55,825 psi | 87% | 2949 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 54,462 psi | 85% | 2966 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 57,740 psi | 90% | 3015 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 54,143 psi | 85% | 3084 fps | 99.1% |
| ADI AR 2225 | <<locked>> | 96% | 57,145 psi | 90% | 3035 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,463 psi | 87% | 2940 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,071 psi | 86% | 2963 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 57,130 psi | 90% | 2917 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 54,114 psi | 85% | 2946 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 56,144 psi | 88% | 3061 fps | 99.1% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,999 psi | 88% | 3051 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,766 psi | 86% | 2933 fps | 99% |
| Bofors RP15 | <<locked>> | 86% | 54,694 psi | 86% | 2956 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 57,696 psi | 90% | 3028 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 55,071 psi | 86% | 2963 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 55,230 psi | 87% | 2972 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,927 psi | 89% | 2956 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,927 psi | 88% | 2940 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 57,508 psi | 90% | 3097 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,029 psi | 60% | 1883 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,116 psi | 90% | 2930 fps | 100% |
| IMR 7828 SSC | <<locked>> | 86% | 57,087 psi | 89% | 3015 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 55,738 psi | 87% | 2887 fps | 96.4% |
| IMR 8133 Enduron | <<locked>> | 98% | 56,057 psi | 88% | 3022 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,927 psi | 89% | 2894 fps | 100% |
| Norma 217 | <<locked>> | 98% | 57,609 psi | 90% | 3041 fps | 100% |
| Norma MRP | <<locked>> | 82% | 55,158 psi | 86% | 2976 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 54,505 psi | 85% | 2979 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 56,884 psi | 89% | 2963 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,088 psi | 61% | 1926 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 54,215 psi | 85% | 3025 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 57,377 psi | 90% | 3058 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 56,014 psi | 88% | 2913 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 55,274 psi | 87% | 2930 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 52,025 psi | 82% | 2913 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,911 psi | 86% | 2927 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 57,435 psi | 90% | 2910 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 55,564 psi | 87% | 2897 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,550 psi | 87% | 2887 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,795 psi | 86% | 2923 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 82% | 55,245 psi | 87% | 2894 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,534 psi | 85% | 2982 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 55,854 psi | 88% | 2982 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 53,882 psi | 84% | 2999 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 92% | 55,187 psi | 86% | 3064 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 84% | 54,172 psi | 85% | 2959 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 55,361 psi | 87% | 2897 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 48,153 psi | 75% | 2756 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 43,076 psi | 68% | 2769 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 80% | 50,372 psi | 79% | 2910 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 80% | 52,243 psi | 82% | 2890 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 47,572 psi | 75% | 2844 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 80% | 35,563 psi | 56% | 2592 fps | 97.5% |
| ADI AR 2218 | 85.4 gr | 88% | 40,379 psi | 63% | 2789 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 32,880 psi | 52% | 2569 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,040 psi | 82% | 2881 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,327 psi | 76% | 2848 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,079 psi | 74% | 2766 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,234 psi | 65% | 2726 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 41,756 psi | 65% | 2785 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 90% | 41,858 psi | 66% | 2779 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,020 psi | 71% | 2753 fps | 97.2% |
| Bofors RP15 | <<locked>> | 80% | 44,991 psi | 71% | 2785 fps | 99.7% |
| Bofors RP30 | <<locked>> | 80% | 38,537 psi | 60% | 2671 fps | 98.3% |
| Bofors RP5 | <<locked>> | 80% | 48,327 psi | 76% | 2848 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 38,711 psi | 61% | 2667 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 80% | 49,777 psi | 78% | 2835 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,037 psi | 77% | 2822 fps | 99.4% |
| Hodgdon Retumbo | 73.3 gr | 80% | 40,350 psi | 63% | 2789 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,645 psi | 45% | 1686 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,401 psi | 79% | 2822 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 80% | 46,354 psi | 73% | 2828 fps | 99.5% |
| IMR 7977 Enduron | <<locked>> | 88% | 52,301 psi | 82% | 2828 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 80% | 30,472 psi | 48% | 2484 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 41,568 psi | 65% | 2635 fps | 100% |
| Norma 217 | <<locked>> | 80% | 30,879 psi | 48% | 2513 fps | 97.6% |
| Norma MRP | <<locked>> | 80% | 51,474 psi | 81% | 2913 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,007 psi | 74% | 2848 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 80% | 42,337 psi | 66% | 2720 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,356 psi | 46% | 1722 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,769 psi | 62% | 2766 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,695 psi | 57% | 2657 fps | 96.3% |
| Rottweil R 904 | <<locked>> | 80% | 52,533 psi | 82% | 2858 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 51,793 psi | 81% | 2874 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 42,351 psi | 66% | 2726 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,445 psi | 81% | 2871 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 53,664 psi | 84% | 2851 fps | 99.8% |
| Somchem S385 | <<locked>> | 80% | 52,141 psi | 82% | 2844 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,788 psi | 72% | 2726 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 44,817 psi | 70% | 2740 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 51,793 psi | 81% | 2841 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,908 psi | 80% | 2920 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 80% | 42,786 psi | 67% | 2743 fps | 98.7% |
| Vihtavuori N568 | <<locked>> | 80% | 37,695 psi | 59% | 2671 fps | 96.1% |
| Vihtavuori N570 | 79.8 gr | 84% | 41,481 psi | 65% | 2792 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,615 psi | 73% | 2841 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,153 psi | 75% | 2782 fps | 99.9% |
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 57 powders for 7-.300 Norma Mag. loaded with the .284 | 173gr | Sellier & Bellot SPCE. Hodgdon Retumbo delivers the highest muzzle velocity at 3,097 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,097 fps. Accurate 8700 gives the best case fill at 100 %, and 57 of the 57 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 173.0 gr projectile in 0.284" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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. ADI AR 2218, Vihtavuori N570, Hodgdon Retumbo rank at the top here: for 7-.300 Norma Mag. with the .284 | 173gr | Sellier & Bellot SPCE they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon 50BMG, Hodgdon US 869, Vihtavuori 20N29 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.