Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 175gr | Hornady InterLock RN bullet and 66 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% | 56,028 psi | 88% | 2815 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,869 psi | 89% | 2831 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 54,723 psi | 86% | 2920 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 88% | 57,551 psi | 90% | 2904 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 55,753 psi | 87% | 2920 fps | 99.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,537 psi | 90% | 2943 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 50,140 psi | 79% | 2923 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,069 psi | 82% | 2913 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,389 psi | 85% | 2835 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,145 psi | 90% | 2890 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,130 psi | 88% | 2913 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,624 psi | 90% | 2871 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,464 psi | 90% | 2943 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,331 psi | 85% | 2907 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,984 psi | 86% | 2982 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,434 psi | 88% | 2881 fps | 98.3% |
| Bofors RP15 | <<locked>> | 92% | 55,317 psi | 87% | 2900 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 57,116 psi | 90% | 2959 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 56,130 psi | 88% | 2913 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,317 psi | 87% | 2910 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,245 psi | 87% | 2851 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,056 psi | 85% | 2835 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,389 psi | 85% | 2759 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,391 psi | 88% | 3031 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,565 psi | 59% | 1785 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,623 psi | 89% | 2822 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,058 psi | 89% | 2825 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,753 psi | 87% | 2831 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 53,911 psi | 84% | 2897 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,616 psi | 75% | 2828 fps | 99.3% |
| Lovex S065 | <<locked>> | 82% | 56,782 psi | 89% | 2795 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,230 psi | 87% | 2799 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,493 psi | 90% | 2835 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,696 psi | 90% | 2884 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 48,254 psi | 76% | 2851 fps | 100% |
| Norma MRP | <<locked>> | 88% | 56,028 psi | 88% | 2930 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,042 psi | 86% | 2815 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,810 psi | 86% | 2920 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 84% | 57,522 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% | 56,927 psi | 89% | 2858 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,390 psi | 87% | 2887 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,159 psi | 90% | 3022 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,420 psi | 88% | 2989 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 86% | 54,708 psi | 86% | 2818 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 88% | 56,898 psi | 89% | 2884 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,782 psi | 89% | 2795 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,230 psi | 87% | 2799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,724 psi | 87% | 2753 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,492 psi | 89% | 2881 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 55,956 psi | 88% | 2808 fps | 99.5% |
| Somchem S365 | <<locked>> | 84% | 56,246 psi | 88% | 2818 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,145 psi | 90% | 2851 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,608 psi | 89% | 2805 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,811 psi | 89% | 2835 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 55,709 psi | 87% | 2858 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 82% | 55,912 psi | 88% | 2812 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,202 psi | 88% | 2848 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,593 psi | 87% | 2930 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 94% | 55,970 psi | 88% | 2920 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 98% | 57,101 psi | 89% | 2989 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 98% | 54,157 psi | 85% | 2986 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,999 psi | 88% | 2759 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,913 psi | 89% | 2959 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,058 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% | 40,277 psi | 63% | 2556 fps | 99.8% |
| Accurate 4350 | <<locked>> | 80% | 53,258 psi | 83% | 2782 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,321 psi | 65% | 2671 fps | 96.6% |
| ADI AR 2209 | <<locked>> | 80% | 44,135 psi | 69% | 2677 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 80% | 39,494 psi | 62% | 2618 fps | 97.1% |
| ADI AR 2217 | <<locked>> | 84% | 33,634 psi | 53% | 2477 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 98% | 46,528 psi | 73% | 2851 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 26,919 psi | 42% | 2329 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,908 psi | 80% | 2785 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,237 psi | 69% | 2674 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,074 psi | 63% | 2625 fps | 98.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,841 psi | 61% | 2572 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,533 psi | 53% | 2507 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,555 psi | 68% | 2733 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 43,932 psi | 69% | 2779 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,990 psi | 69% | 2654 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 37,362 psi | 59% | 2566 fps | 97.6% |
| Bofors RP30 | <<locked>> | 82% | 33,301 psi | 52% | 2497 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 40,074 psi | 63% | 2625 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 80% | 32,039 psi | 50% | 2438 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 80% | 42,061 psi | 66% | 2618 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,321 psi | 65% | 2602 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,935 psi | 75% | 2664 fps | 100% |
| Hodgdon Retumbo | 61.6 gr | 80% | 32,808 psi | 51% | 2539 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 44% | 1594 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,835 psi | 78% | 2717 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 50,285 psi | 79% | 2726 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,366 psi | 68% | 2615 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 80% | 38,203 psi | 60% | 2598 fps | 96.8% |
| IMR 8133 Enduron | <<locked>> | 90% | 33,982 psi | 53% | 2536 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 53,388 psi | 84% | 2746 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,938 psi | 81% | 2746 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,664 psi | 54% | 2434 fps | 99% |
| Norma 204 | <<locked>> | 80% | 50,589 psi | 79% | 2769 fps | 99.7% |
| Norma 217 | <<locked>> | 84% | 27,905 psi | 44% | 2385 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 42,337 psi | 66% | 2694 fps | 99.6% |
| Norma URP | <<locked>> | 80% | 51,648 psi | 81% | 2762 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,029 psi | 60% | 2608 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 80% | 50,560 psi | 79% | 2772 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,098 psi | 53% | 2493 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,848 psi | 45% | 1631 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,200 psi | 83% | 2805 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,648 psi | 81% | 2831 fps | 100% |
| ReloadSwiss RS 76 | 65.9 gr | 80% | 31,792 psi | 50% | 2513 fps | 97.7% |
| ReloadSwiss RS 80 | 73.1 gr | 88% | 38,696 psi | 61% | 2661 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 45,237 psi | 71% | 2654 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 80% | 43,700 psi | 68% | 2661 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,388 psi | 84% | 2746 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,938 psi | 81% | 2746 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,330 psi | 82% | 2700 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,352 psi | 68% | 2657 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 46,093 psi | 72% | 2644 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 49,110 psi | 77% | 2717 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,106 psi | 69% | 2638 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 53,127 psi | 83% | 2756 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,537 psi | 60% | 2520 fps | 98.5% |
| Vihtavuori N170 | <<locked>> | 94% | 52,083 psi | 82% | 2799 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 52,344 psi | 82% | 2759 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,410 psi | 68% | 2648 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,192 psi | 66% | 2687 fps | 97.4% |
| Vihtavuori N565 | <<locked>> | 80% | 34,882 psi | 55% | 2510 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 40,132 psi | 63% | 2677 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 94% | 46,934 psi | 74% | 2854 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,156 psi | 82% | 2707 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,245 psi | 57% | 2625 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,596 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 | Hornady InterLock RN. Hodgdon Retumbo delivers the highest muzzle velocity at 3,031 fps; across all powders the maximum-charge window runs from 1,785 fps to 3,031 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 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 | Hornady InterLock RN 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.