Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 175gr | Speer Deep Curl Soft Point bullet and 67 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% | 55,999 psi | 88% | 2815 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,826 psi | 89% | 2835 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 57,740 psi | 90% | 2976 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 54,679 psi | 86% | 2920 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 88% | 57,522 psi | 90% | 2900 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 55,738 psi | 87% | 2920 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 53,751 psi | 84% | 2887 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 50,111 psi | 79% | 2927 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,025 psi | 82% | 2910 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,360 psi | 85% | 2835 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,101 psi | 89% | 2894 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,101 psi | 88% | 2913 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,609 psi | 90% | 2867 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,450 psi | 90% | 2943 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,331 psi | 85% | 2910 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,940 psi | 86% | 2982 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,449 psi | 88% | 2877 fps | 98.3% |
| Bofors RP15 | <<locked>> | 92% | 55,288 psi | 87% | 2900 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 57,363 psi | 90% | 2959 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 56,101 psi | 88% | 2913 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,288 psi | 87% | 2910 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,216 psi | 87% | 2854 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,041 psi | 85% | 2835 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,360 psi | 85% | 2756 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,362 psi | 88% | 3028 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,550 psi | 59% | 1785 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,594 psi | 89% | 2825 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,029 psi | 89% | 2825 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,753 psi | 87% | 2831 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 53,882 psi | 84% | 2897 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,572 psi | 75% | 2828 fps | 99.3% |
| Lovex S065 | <<locked>> | 82% | 56,768 psi | 89% | 2795 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,216 psi | 87% | 2799 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,464 psi | 90% | 2835 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,667 psi | 90% | 2884 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 48,269 psi | 76% | 2851 fps | 100% |
| Norma MRP | <<locked>> | 88% | 55,985 psi | 88% | 2930 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,013 psi | 86% | 2812 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,781 psi | 86% | 2920 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 84% | 57,493 psi | 90% | 2877 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,319 psi | 90% | 2910 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,493 psi | 60% | 1827 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,898 psi | 89% | 2858 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,361 psi | 87% | 2884 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,116 psi | 90% | 3022 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,405 psi | 88% | 2986 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 86% | 54,679 psi | 86% | 2815 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 88% | 56,869 psi | 89% | 2884 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,768 psi | 89% | 2795 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,216 psi | 87% | 2799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,724 psi | 87% | 2753 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,463 psi | 88% | 2881 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 56,159 psi | 88% | 2812 fps | 99.5% |
| Somchem S365 | <<locked>> | 84% | 56,202 psi | 88% | 2818 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,145 psi | 90% | 2851 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,579 psi | 89% | 2805 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,043 psi | 89% | 2838 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 55,724 psi | 87% | 2858 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 82% | 55,883 psi | 88% | 2812 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,173 psi | 88% | 2848 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,550 psi | 87% | 2930 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 94% | 56,202 psi | 88% | 2923 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 98% | 57,101 psi | 89% | 2989 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 98% | 54,128 psi | 85% | 2986 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,970 psi | 88% | 2759 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,174 psi | 90% | 2963 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,029 psi | 89% | 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% | 40,248 psi | 63% | 2552 fps | 99.8% |
| Accurate 4350 | <<locked>> | 80% | 53,214 psi | 83% | 2782 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 43,801 psi | 69% | 2733 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 80% | 41,321 psi | 65% | 2671 fps | 96.6% |
| ADI AR 2209 | <<locked>> | 80% | 44,106 psi | 69% | 2677 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 80% | 39,465 psi | 62% | 2618 fps | 97.1% |
| ADI AR 2217 | <<locked>> | 84% | 33,620 psi | 53% | 2477 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 98% | 46,688 psi | 73% | 2854 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 26,934 psi | 42% | 2329 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,923 psi | 80% | 2782 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,208 psi | 69% | 2674 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,045 psi | 63% | 2625 fps | 98.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,856 psi | 61% | 2572 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,504 psi | 53% | 2507 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,555 psi | 68% | 2733 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 43,918 psi | 69% | 2782 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,961 psi | 69% | 2651 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 37,376 psi | 59% | 2566 fps | 97.6% |
| Bofors RP30 | <<locked>> | 82% | 33,272 psi | 52% | 2497 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 40,045 psi | 63% | 2625 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 80% | 32,024 psi | 50% | 2438 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 80% | 42,032 psi | 66% | 2618 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,321 psi | 65% | 2605 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,935 psi | 75% | 2661 fps | 100% |
| Hodgdon Retumbo | 61.6 gr | 80% | 32,779 psi | 51% | 2539 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 44% | 1591 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,806 psi | 78% | 2717 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 50,256 psi | 79% | 2723 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,352 psi | 68% | 2612 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 80% | 38,189 psi | 60% | 2598 fps | 96.8% |
| IMR 8133 Enduron | <<locked>> | 90% | 33,997 psi | 53% | 2539 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 53,388 psi | 84% | 2746 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,909 psi | 81% | 2746 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,650 psi | 54% | 2434 fps | 99% |
| Norma 204 | <<locked>> | 80% | 50,560 psi | 79% | 2772 fps | 99.7% |
| Norma 217 | <<locked>> | 84% | 28,021 psi | 44% | 2388 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 42,308 psi | 66% | 2694 fps | 99.6% |
| Norma URP | <<locked>> | 80% | 51,619 psi | 81% | 2762 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,043 psi | 60% | 2608 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 80% | 50,575 psi | 79% | 2772 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,084 psi | 53% | 2493 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,834 psi | 45% | 1631 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,200 psi | 83% | 2805 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,619 psi | 81% | 2828 fps | 100% |
| ReloadSwiss RS 76 | 65.9 gr | 80% | 31,792 psi | 50% | 2513 fps | 97.7% |
| ReloadSwiss RS 80 | 73.1 gr | 88% | 38,667 psi | 61% | 2661 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 45,208 psi | 71% | 2654 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 80% | 43,671 psi | 68% | 2661 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,388 psi | 84% | 2746 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,909 psi | 81% | 2746 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,315 psi | 82% | 2703 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,323 psi | 68% | 2657 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 46,064 psi | 72% | 2644 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 49,110 psi | 77% | 2717 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,077 psi | 69% | 2638 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 53,127 psi | 83% | 2756 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,522 psi | 60% | 2520 fps | 98.5% |
| Vihtavuori N170 | <<locked>> | 94% | 52,098 psi | 82% | 2799 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 52,315 psi | 82% | 2759 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,439 psi | 68% | 2648 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,177 psi | 66% | 2687 fps | 97.4% |
| Vihtavuori N565 | <<locked>> | 80% | 34,896 psi | 55% | 2510 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 40,103 psi | 63% | 2677 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 94% | 46,920 psi | 74% | 2854 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,185 psi | 82% | 2707 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,201 psi | 57% | 2625 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,582 psi | 64% | 2572 fps | 98.5% |
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 73 powders for 7 x 66 SE v. Hofe loaded with the .284 | 175gr | Speer Deep Curl Soft Point. Hodgdon Retumbo delivers the highest muzzle velocity at 3,028 fps; across all powders the maximum-charge window runs from 1,785 fps to 3,028 fps. Accurate 8700 gives the best case fill at 100 %, and 73 of the 73 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 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 | Speer Deep Curl Soft Point they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, IMR 7977 Enduron, Lovex D100 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.