Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 175gr | A-Square MONO RN bullet and 55 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, 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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 55,463 psi | 87% | 2815 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 54,346 psi | 85% | 2923 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 86% | 56,782 psi | 89% | 2900 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 55,129 psi | 86% | 2920 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 57,305 psi | 90% | 2949 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,650 psi | 84% | 3005 fps | 98.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,999 psi | 88% | 2972 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,261 psi | 90% | 2884 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,362 psi | 88% | 2890 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,593 psi | 87% | 2913 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,421 psi | 90% | 2871 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,551 psi | 90% | 2946 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,056 psi | 85% | 2907 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 55,056 psi | 86% | 2989 fps | 98.3% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 50,488 psi | 79% | 2907 fps | 96.9% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,738 psi | 87% | 2881 fps | 98.5% |
| Bofors RP15 | <<locked>> | 90% | 55,042 psi | 86% | 2904 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 57,232 psi | 90% | 2966 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 55,593 psi | 87% | 2913 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 55,056 psi | 86% | 2917 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 54,317 psi | 85% | 2851 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,058 psi | 89% | 2890 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,305 psi | 90% | 2805 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,579 psi | 89% | 3038 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,724 psi | 59% | 1808 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,550 psi | 87% | 2818 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,376 psi | 88% | 2822 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,868 psi | 86% | 2828 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 90% | 57,435 psi | 90% | 2963 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,372 psi | 81% | 2894 fps | 99.8% |
| Lovex S071 | <<locked>> | 94% | 57,087 psi | 89% | 2838 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,681 psi | 89% | 2877 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 52,286 psi | 82% | 2917 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,550 psi | 87% | 2927 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,534 psi | 85% | 2923 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 56,637 psi | 89% | 2874 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,971 psi | 89% | 2910 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,638 psi | 61% | 1850 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 57,174 psi | 90% | 3025 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 56,637 psi | 89% | 2995 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 86% | 57,363 psi | 90% | 2871 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 56,231 psi | 88% | 2884 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,840 psi | 88% | 2881 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 55,085 psi | 86% | 2808 fps | 99.5% |
| Somchem S365 | <<locked>> | 82% | 55,535 psi | 87% | 2815 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,579 psi | 89% | 2851 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,260 psi | 88% | 2838 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 55,332 psi | 87% | 2864 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 86% | 55,825 psi | 87% | 2848 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,056 psi | 86% | 2930 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 92% | 55,912 psi | 88% | 2927 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 96% | 57,203 psi | 90% | 2995 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 96% | 54,418 psi | 85% | 2995 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,261 psi | 90% | 2963 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,391 psi | 88% | 2851 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% | 42,612 psi | 67% | 2608 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 43,961 psi | 69% | 2733 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 80% | 46,557 psi | 73% | 2733 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 41,872 psi | 66% | 2677 fps | 98% |
| ADI AR 2217 | <<locked>> | 82% | 33,446 psi | 52% | 2484 fps | 95.6% |
| ADI AR 2218 | <<locked>> | 94% | 43,134 psi | 68% | 2789 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 28,558 psi | 45% | 2392 fps | 96.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,606 psi | 84% | 2831 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,572 psi | 73% | 2726 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,598 psi | 67% | 2684 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,408 psi | 65% | 2625 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,708 psi | 56% | 2562 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,572 psi | 73% | 2789 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 44,121 psi | 69% | 2789 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 98% | 46,949 psi | 74% | 2838 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 43,294 psi | 68% | 2651 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 39,697 psi | 62% | 2621 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 33,301 psi | 52% | 2497 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 42,598 psi | 67% | 2684 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 33,881 psi | 53% | 2497 fps | 96.5% |
| Hodgdon H4831 | <<locked>> | 80% | 44,425 psi | 70% | 2677 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,714 psi | 69% | 2661 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,459 psi | 79% | 2710 fps | 100% |
| Hodgdon Retumbo | 64.9 gr | 80% | 34,867 psi | 55% | 2605 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,384 psi | 44% | 1617 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,185 psi | 82% | 2766 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 52,910 psi | 83% | 2772 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,469 psi | 71% | 2664 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 40,669 psi | 64% | 2661 fps | 97.8% |
| IMR 8133 Enduron | <<locked>> | 88% | 34,200 psi | 54% | 2543 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 36,840 psi | 58% | 2490 fps | 99.5% |
| Norma 204 | <<locked>> | 80% | 53,127 psi | 83% | 2825 fps | 99.9% |
| Norma 217 | <<locked>> | 82% | 28,079 psi | 44% | 2392 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 45,150 psi | 71% | 2753 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 40,538 psi | 64% | 2671 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 80% | 53,214 psi | 83% | 2822 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,506 psi | 57% | 2552 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,109 psi | 46% | 1654 fps | 100% |
| ReloadSwiss RS 76 | 69.5 gr | 80% | 34,069 psi | 53% | 2582 fps | 98.8% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 35,911 psi | 56% | 2598 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 47,514 psi | 74% | 2707 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 46,166 psi | 72% | 2717 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,832 psi | 72% | 2713 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 48,341 psi | 76% | 2697 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 51,967 psi | 81% | 2762 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,586 psi | 73% | 2690 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 40,698 psi | 64% | 2572 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 48,356 psi | 76% | 2743 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 45,905 psi | 72% | 2697 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,875 psi | 70% | 2749 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 80% | 37,202 psi | 58% | 2569 fps | 96.4% |
| Vihtavuori N568 | <<locked>> | 84% | 37,304 psi | 58% | 2618 fps | 95% |
| Vihtavuori N570 | 75.8 gr | 90% | 43,830 psi | 69% | 2795 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,334 psi | 62% | 2680 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,728 psi | 67% | 2621 fps | 99.1% |
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 62 powders for 7 x 66 SE v. Hofe loaded with the .284 | 175gr | A-Square MONO RN. Hodgdon Retumbo delivers the highest muzzle velocity at 3,038 fps; across all powders the maximum-charge window runs from 1,808 fps to 3,038 fps. Accurate 8700 gives the best case fill at 100 %, and 62 of the 62 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 1:16.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 175gr | A-Square MONO RN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, Lovex D100, Ramshot LRT 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.