Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 175gr | 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 Hodgdon Retumbo, ReloadSwiss RS 76 and ReloadSwiss RS 80.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 90% | 55,042 psi | 86% | 2799 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,941 psi | 88% | 2818 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 57,638 psi | 90% | 2963 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 88% | 56,565 psi | 89% | 2884 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 54,563 psi | 86% | 2897 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,507 psi | 89% | 2927 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 48,921 psi | 77% | 2897 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,850 psi | 80% | 2890 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,869 psi | 89% | 2867 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,188 psi | 88% | 2877 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 54,940 psi | 86% | 2894 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,608 psi | 89% | 2854 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,231 psi | 88% | 2923 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,305 psi | 90% | 2946 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,519 psi | 84% | 2956 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,608 psi | 87% | 2861 fps | 98.1% |
| Bofors RP15 | <<locked>> | 92% | 54,360 psi | 85% | 2884 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 55,985 psi | 88% | 2940 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 54,940 psi | 86% | 2894 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 57,217 psi | 90% | 2812 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,244 psi | 85% | 2890 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 57,305 psi | 90% | 2874 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,099 psi | 85% | 2831 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,768 psi | 89% | 2874 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,174 psi | 90% | 2792 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,172 psi | 86% | 3012 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,550 psi | 59% | 1778 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,637 psi | 87% | 2805 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,246 psi | 88% | 2808 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 54,911 psi | 86% | 2812 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 92% | 56,623 psi | 89% | 2936 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,557 psi | 73% | 2805 fps | 99.1% |
| Lovex S065 | <<locked>> | 82% | 55,999 psi | 88% | 2782 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 54,462 psi | 85% | 2782 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,550 psi | 89% | 2818 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,710 psi | 89% | 2864 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 47,137 psi | 74% | 2831 fps | 100% |
| Norma MRP | <<locked>> | 88% | 55,056 psi | 86% | 2913 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,215 psi | 85% | 2799 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 57,711 psi | 90% | 2959 fps | 100% |
| Ramshot Hunter | <<locked>> | 84% | 56,521 psi | 89% | 2858 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 55,912 psi | 88% | 2887 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,479 psi | 60% | 1821 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 55,898 psi | 88% | 2838 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,317 psi | 85% | 2867 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,738 psi | 87% | 2999 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,129 psi | 86% | 2969 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 88% | 57,566 psi | 90% | 2854 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 88% | 55,898 psi | 88% | 2864 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 57,217 psi | 90% | 2812 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,999 psi | 88% | 2782 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,462 psi | 85% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 54,998 psi | 86% | 2736 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,477 psi | 87% | 2864 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 55,187 psi | 86% | 2792 fps | 99.3% |
| Somchem S365 | <<locked>> | 84% | 55,114 psi | 86% | 2802 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,231 psi | 88% | 2835 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 55,825 psi | 87% | 2789 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,941 psi | 88% | 2818 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 54,810 psi | 86% | 2838 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 82% | 54,897 psi | 86% | 2795 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,129 psi | 86% | 2831 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,636 psi | 86% | 2913 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 94% | 54,882 psi | 86% | 2900 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 98% | 55,782 psi | 87% | 2966 fps | 99.1% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 56,811 psi | 89% | 3028 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,100 psi | 86% | 2743 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,566 psi | 90% | 2877 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 55,695 psi | 87% | 2943 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,202 psi | 88% | 2835 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 39,523 psi | 62% | 2536 fps | 99.7% |
| Accurate 4350 | <<locked>> | 80% | 52,344 psi | 82% | 2766 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 40,640 psi | 64% | 2654 fps | 96.3% |
| ADI AR 2209 | <<locked>> | 80% | 43,352 psi | 68% | 2657 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 80% | 38,812 psi | 61% | 2598 fps | 96.8% |
| ADI AR 2217 | <<locked>> | 86% | 35,375 psi | 55% | 2520 fps | 96% |
| ADI AR 2218 | <<locked>> | 98% | 45,556 psi | 71% | 2825 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 82% | 28,181 psi | 44% | 2369 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,009 psi | 78% | 2769 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,497 psi | 68% | 2657 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,334 psi | 62% | 2608 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,232 psi | 60% | 2559 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,895 psi | 52% | 2490 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,569 psi | 67% | 2713 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 46,253 psi | 72% | 2825 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,352 psi | 68% | 2635 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 36,666 psi | 57% | 2546 fps | 97.3% |
| Bofors RP30 | <<locked>> | 82% | 32,605 psi | 51% | 2477 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 39,334 psi | 62% | 2608 fps | 98.2% |
| Bofors RP7 | <<locked>> | 80% | 53,969 psi | 85% | 2766 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 33,649 psi | 53% | 2477 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 53,534 psi | 84% | 2818 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,379 psi | 65% | 2602 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,640 psi | 64% | 2585 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,108 psi | 74% | 2648 fps | 100% |
| Hodgdon Retumbo | 60.6 gr | 80% | 32,169 psi | 50% | 2520 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 44% | 1588 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,110 psi | 77% | 2703 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,458 psi | 78% | 2710 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,699 psi | 67% | 2595 fps | 97.4% |
| IMR 7828 SSC | <<locked>> | 80% | 37,521 psi | 59% | 2579 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 90% | 33,257 psi | 52% | 2516 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 52,823 psi | 83% | 2733 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,155 psi | 80% | 2733 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,084 psi | 53% | 2421 fps | 98.8% |
| Norma 204 | <<locked>> | 80% | 49,632 psi | 78% | 2749 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 29,225 psi | 46% | 2425 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 41,553 psi | 65% | 2677 fps | 99.5% |
| Norma URP | <<locked>> | 80% | 50,778 psi | 80% | 2746 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,318 psi | 58% | 2592 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 80% | 49,588 psi | 78% | 2753 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,315 psi | 52% | 2470 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,863 psi | 45% | 1627 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,388 psi | 82% | 2789 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,604 psi | 79% | 2812 fps | 100% |
| ReloadSwiss RS 76 | 64.9 gr | 80% | 31,256 psi | 49% | 2493 fps | 97.4% |
| ReloadSwiss RS 80 | 71.9 gr | 88% | 37,739 psi | 59% | 2638 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 44,512 psi | 70% | 2635 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 80% | 42,902 psi | 67% | 2641 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 80% | 53,969 psi | 85% | 2766 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,823 psi | 83% | 2733 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,155 psi | 80% | 2733 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,634 psi | 81% | 2687 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,612 psi | 67% | 2641 fps | 98.9% |
| Somchem S361 | <<locked>> | 80% | 45,295 psi | 71% | 2628 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 48,240 psi | 76% | 2700 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,381 psi | 68% | 2621 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 52,330 psi | 82% | 2740 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,869 psi | 59% | 2503 fps | 98.3% |
| Vihtavuori N170 | <<locked>> | 94% | 51,184 psi | 80% | 2779 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 51,590 psi | 81% | 2746 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,583 psi | 67% | 2631 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,466 psi | 65% | 2671 fps | 97.2% |
| Vihtavuori N565 | <<locked>> | 82% | 36,738 psi | 58% | 2552 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 88% | 39,146 psi | 61% | 2654 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 94% | 45,905 psi | 72% | 2831 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,517 psi | 81% | 2694 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,737 psi | 84% | 2818 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,172 psi | 55% | 2605 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,726 psi | 62% | 2549 fps | 98.2% |
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 70 powders for 7 x 66 SE v. Hofe loaded with the .284 | 175gr | Swift A-Frame. Vihtavuori N570 delivers the highest muzzle velocity at 3,028 fps; across all powders the maximum-charge window runs from 1,778 fps to 3,028 fps. ADI AR 2217 gives the best case fill at 100 %, and 70 of the 70 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, 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. ADI AR 2217, ADI AR 2218, ADI AR 2225 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. Hodgdon Retumbo, ReloadSwiss RS 76, ReloadSwiss RS 80 rank at the top here: for 7 x 66 SE v. Hofe 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.