Load Specifications
Load data in caliber 7-.300 Norma Mag. with .284 | 175gr | Swift A-Frame 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% | 54,781 psi | 86% | 2844 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,719 psi | 78% | 2884 fps | 97.6% |
| Accurate MAGPRO | <<locked>> | 84% | 57,522 psi | 90% | 3015 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 82% | 55,695 psi | 87% | 2930 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 54,360 psi | 85% | 2949 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 57,348 psi | 90% | 2992 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 53,751 psi | 84% | 3061 fps | 99.1% |
| ADI AR 2225 | <<locked>> | 96% | 56,797 psi | 89% | 3015 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,317 psi | 87% | 2920 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,969 psi | 86% | 2943 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 57,000 psi | 89% | 2897 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,566 psi | 90% | 2979 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,738 psi | 87% | 3038 fps | 99.1% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,651 psi | 87% | 3031 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,607 psi | 86% | 2913 fps | 99% |
| Bofors RP15 | <<locked>> | 86% | 54,418 psi | 85% | 2936 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 57,305 psi | 90% | 3005 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,969 psi | 86% | 2943 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,781 psi | 86% | 2949 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,855 psi | 89% | 2940 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,825 psi | 87% | 2920 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 57,261 psi | 90% | 3077 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,000 psi | 60% | 1867 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,811 psi | 89% | 2910 fps | 100% |
| IMR 7828 SSC | <<locked>> | 86% | 56,797 psi | 89% | 2995 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 55,564 psi | 87% | 2867 fps | 96.4% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,695 psi | 87% | 2999 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,623 psi | 89% | 2871 fps | 100% |
| Norma 217 | <<locked>> | 98% | 57,232 psi | 90% | 3018 fps | 100% |
| Norma MRP | <<locked>> | 82% | 55,071 psi | 86% | 2956 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 54,215 psi | 85% | 2956 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 56,478 psi | 89% | 2943 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,073 psi | 61% | 1913 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 53,824 psi | 84% | 3002 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 57,101 psi | 89% | 3041 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 55,869 psi | 88% | 2897 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 55,129 psi | 86% | 2910 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,619 psi | 81% | 2890 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,766 psi | 86% | 2907 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 57,217 psi | 90% | 2890 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 55,419 psi | 87% | 2881 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,288 psi | 87% | 2867 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,679 psi | 86% | 2904 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 82% | 55,042 psi | 86% | 2874 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,447 psi | 85% | 2963 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 55,666 psi | 87% | 2963 fps | 100% |
| Vihtavuori N568 | <<locked>> | 92% | 57,450 psi | 90% | 3041 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 92% | 54,853 psi | 86% | 3041 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 84% | 53,853 psi | 84% | 2940 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 55,085 psi | 86% | 2877 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% | 48,008 psi | 75% | 2740 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 42,859 psi | 67% | 2753 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 80% | 50,067 psi | 78% | 2890 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 80% | 52,069 psi | 82% | 2871 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 47,224 psi | 74% | 2825 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 80% | 35,389 psi | 55% | 2575 fps | 97.5% |
| ADI AR 2218 | 84.3 gr | 88% | 40,118 psi | 63% | 2769 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 32,619 psi | 51% | 2546 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,866 psi | 81% | 2864 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,979 psi | 75% | 2825 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,862 psi | 73% | 2746 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,060 psi | 64% | 2707 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 41,437 psi | 65% | 2766 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 90% | 41,437 psi | 65% | 2759 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,962 psi | 70% | 2736 fps | 97.2% |
| Bofors RP15 | <<locked>> | 80% | 44,817 psi | 70% | 2766 fps | 99.7% |
| Bofors RP30 | <<locked>> | 80% | 38,377 psi | 60% | 2654 fps | 98.3% |
| Bofors RP5 | <<locked>> | 80% | 47,979 psi | 75% | 2825 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 38,551 psi | 60% | 2651 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 80% | 49,617 psi | 78% | 2818 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,718 psi | 76% | 2802 fps | 99.4% |
| Hodgdon Retumbo | 72.3 gr | 80% | 40,045 psi | 63% | 2766 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,514 psi | 45% | 1667 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,227 psi | 79% | 2802 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 80% | 46,195 psi | 72% | 2815 fps | 99.5% |
| IMR 7977 Enduron | <<locked>> | 88% | 52,098 psi | 82% | 2808 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 80% | 30,298 psi | 47% | 2467 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 41,350 psi | 65% | 2618 fps | 100% |
| Norma 217 | <<locked>> | 80% | 30,705 psi | 48% | 2497 fps | 97.7% |
| Norma MRP | <<locked>> | 80% | 51,329 psi | 80% | 2897 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,833 psi | 73% | 2831 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 80% | 42,018 psi | 66% | 2700 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,370 psi | 46% | 1709 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,494 psi | 62% | 2746 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,463 psi | 57% | 2638 fps | 96.3% |
| Rottweil R 904 | <<locked>> | 80% | 52,359 psi | 82% | 2841 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 51,561 psi | 81% | 2854 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 42,105 psi | 66% | 2710 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,213 psi | 80% | 2851 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 53,403 psi | 84% | 2831 fps | 99.8% |
| Somchem S385 | <<locked>> | 80% | 51,808 psi | 81% | 2822 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,614 psi | 71% | 2707 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 44,614 psi | 70% | 2720 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 51,576 psi | 81% | 2822 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,763 psi | 80% | 2900 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 80% | 42,496 psi | 67% | 2723 fps | 98.7% |
| Vihtavuori N568 | <<locked>> | 80% | 37,579 psi | 59% | 2657 fps | 96.1% |
| Vihtavuori N570 | 78.8 gr | 84% | 41,205 psi | 65% | 2772 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,398 psi | 73% | 2825 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,037 psi | 75% | 2762 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 50 powders for 7-.300 Norma Mag. loaded with the .284 | 175gr | Swift A-Frame. Hodgdon Retumbo delivers the highest muzzle velocity at 3,077 fps; across all powders the maximum-charge window runs from 1,867 fps to 3,077 fps. Accurate 8700 gives the best case fill at 100 %, and 50 of the 50 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 175.0 gr projectile in 0.284" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, ReloadSwiss RS 14 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 | 175gr | Swift A-Frame 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.