Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 175gr | Woodleigh PP SN bullet and 68 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% | 55,724 psi | 87% | 2808 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,492 psi | 89% | 2828 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 54,418 psi | 85% | 2913 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 88% | 57,217 psi | 90% | 2897 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 55,230 psi | 87% | 2910 fps | 99.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,305 psi | 90% | 2940 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 49,777 psi | 78% | 2917 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,590 psi | 81% | 2904 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,392 psi | 90% | 2877 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,855 psi | 89% | 2887 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,564 psi | 87% | 2904 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,290 psi | 90% | 2864 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,898 psi | 89% | 2933 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 53,780 psi | 84% | 2900 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,273 psi | 85% | 2969 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,057 psi | 88% | 2871 fps | 98.2% |
| Bofors RP15 | <<locked>> | 92% | 54,824 psi | 86% | 2894 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 56,840 psi | 89% | 2953 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 55,564 psi | 87% | 2904 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 57,667 psi | 90% | 2822 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,071 psi | 86% | 2907 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,752 psi | 86% | 2844 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,377 psi | 90% | 2884 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,638 psi | 90% | 2799 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,869 psi | 88% | 3022 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,463 psi | 59% | 1781 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,318 psi | 88% | 2818 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,739 psi | 89% | 2818 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,521 psi | 87% | 2825 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 92% | 57,319 psi | 90% | 2949 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,123 psi | 74% | 2818 fps | 99.2% |
| Lovex S065 | <<locked>> | 82% | 56,463 psi | 88% | 2789 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 54,926 psi | 86% | 2792 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,174 psi | 90% | 2828 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,392 psi | 90% | 2877 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 47,776 psi | 75% | 2844 fps | 100% |
| Norma MRP | <<locked>> | 88% | 55,680 psi | 87% | 2923 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,694 psi | 86% | 2808 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,462 psi | 85% | 2913 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 84% | 57,217 psi | 90% | 2871 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,811 psi | 89% | 2904 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,406 psi | 60% | 1824 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,594 psi | 89% | 2851 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,056 psi | 86% | 2881 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,637 psi | 89% | 3015 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,956 psi | 88% | 2982 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 86% | 54,404 psi | 85% | 2808 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 56,347 psi | 88% | 2874 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 57,667 psi | 90% | 2822 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,463 psi | 88% | 2789 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,926 psi | 86% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,463 psi | 87% | 2746 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,941 psi | 88% | 2871 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 55,738 psi | 87% | 2805 fps | 99.4% |
| Somchem S365 | <<locked>> | 84% | 55,883 psi | 88% | 2812 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,898 psi | 89% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,275 psi | 88% | 2799 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,550 psi | 89% | 2831 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 55,317 psi | 87% | 2848 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 82% | 55,347 psi | 87% | 2805 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,608 psi | 87% | 2841 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,288 psi | 87% | 2927 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 94% | 55,709 psi | 87% | 2913 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 98% | 56,608 psi | 89% | 2979 fps | 99.3% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,696 psi | 90% | 3041 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,448 psi | 87% | 2749 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,492 psi | 89% | 2956 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,550 psi | 89% | 2841 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% | 39,958 psi | 63% | 2546 fps | 99.7% |
| Accurate 4350 | <<locked>> | 80% | 52,866 psi | 83% | 2776 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,046 psi | 64% | 2664 fps | 96.5% |
| ADI AR 2209 | <<locked>> | 80% | 43,801 psi | 69% | 2671 fps | 99% |
| ADI AR 2213 | <<locked>> | 80% | 39,204 psi | 61% | 2608 fps | 97% |
| ADI AR 2217 | <<locked>> | 84% | 33,402 psi | 52% | 2470 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 98% | 46,151 psi | 72% | 2841 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 82% | 28,471 psi | 45% | 2382 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,560 psi | 79% | 2779 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,918 psi | 69% | 2667 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,769 psi | 62% | 2618 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,537 psi | 60% | 2566 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,243 psi | 52% | 2500 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,018 psi | 67% | 2723 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 43,526 psi | 68% | 2772 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,772 psi | 69% | 2648 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 37,086 psi | 58% | 2556 fps | 97.5% |
| Bofors RP30 | <<locked>> | 82% | 33,011 psi | 52% | 2490 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 39,769 psi | 62% | 2618 fps | 98.3% |
| Bofors RP7 | <<locked>> | 80% | 54,186 psi | 85% | 2769 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 31,807 psi | 50% | 2428 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 80% | 41,771 psi | 65% | 2612 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,031 psi | 64% | 2595 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,587 psi | 75% | 2657 fps | 100% |
| Hodgdon Retumbo | 61.2 gr | 80% | 32,532 psi | 51% | 2533 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,152 psi | 44% | 1591 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,516 psi | 78% | 2710 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,937 psi | 78% | 2720 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,091 psi | 68% | 2605 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 80% | 37,927 psi | 59% | 2592 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 90% | 33,736 psi | 53% | 2530 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 53,069 psi | 83% | 2740 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,590 psi | 81% | 2743 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,505 psi | 54% | 2431 fps | 98.9% |
| Norma 204 | <<locked>> | 80% | 50,285 psi | 79% | 2766 fps | 99.7% |
| Norma 217 | <<locked>> | 86% | 29,573 psi | 46% | 2434 fps | 96% |
| Norma MRP | <<locked>> | 80% | 42,018 psi | 66% | 2687 fps | 99.6% |
| Norma URP | <<locked>> | 80% | 51,285 psi | 80% | 2756 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,739 psi | 59% | 2602 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 80% | 50,256 psi | 79% | 2766 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,692 psi | 53% | 2484 fps | 97.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,877 psi | 45% | 1631 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,881 psi | 83% | 2799 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,068 psi | 80% | 2822 fps | 100% |
| ReloadSwiss RS 76 | 65.5 gr | 80% | 31,560 psi | 49% | 2507 fps | 97.6% |
| ReloadSwiss RS 80 | 72.6 gr | 88% | 38,261 psi | 60% | 2651 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 44,918 psi | 70% | 2648 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 80% | 43,366 psi | 68% | 2654 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 80% | 54,186 psi | 85% | 2769 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,069 psi | 83% | 2740 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,590 psi | 81% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,025 psi | 82% | 2694 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,018 psi | 67% | 2651 fps | 99% |
| Somchem S361 | <<locked>> | 80% | 45,643 psi | 72% | 2635 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 48,776 psi | 76% | 2710 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,801 psi | 69% | 2631 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 52,808 psi | 83% | 2749 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,261 psi | 60% | 2513 fps | 98.4% |
| Vihtavuori N170 | <<locked>> | 94% | 51,692 psi | 81% | 2792 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 52,025 psi | 82% | 2756 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,091 psi | 68% | 2641 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,858 psi | 66% | 2680 fps | 97.3% |
| Vihtavuori N565 | <<locked>> | 80% | 34,606 psi | 54% | 2503 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 88% | 39,653 psi | 62% | 2667 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 94% | 46,456 psi | 73% | 2844 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,895 psi | 81% | 2700 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,897 psi | 56% | 2618 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,321 psi | 63% | 2566 fps | 98.4% |
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 74 powders for 7 x 66 SE v. Hofe loaded with the .284 | 175gr | Woodleigh PP SN. Vihtavuori N570 delivers the highest muzzle velocity at 3,041 fps; across all powders the maximum-charge window runs from 1,781 fps to 3,041 fps. Accurate 8700 gives the best case fill at 100 %, and 74 of the 74 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 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2217, ADI AR 2218 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 | Woodleigh PP SN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, Lovex D100, Shooters World 50 BMG 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.