Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 175gr | Speer Magnum Tip Soft Point 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% | 56,666 psi | 89% | 2825 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,363 psi | 90% | 2841 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 54,607 psi | 86% | 2927 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 88% | 55,347 psi | 87% | 2933 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 86% | 54,389 psi | 85% | 2858 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 56,420 psi | 88% | 2930 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 54,592 psi | 86% | 2904 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 50,778 psi | 80% | 2940 fps | 97.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,649 psi | 83% | 2920 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 54,694 psi | 86% | 2854 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,911 psi | 86% | 2844 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,537 psi | 90% | 2900 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,797 psi | 89% | 2923 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 54,737 psi | 86% | 2831 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,447 psi | 85% | 2900 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,056 psi | 86% | 2920 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,724 psi | 87% | 2995 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,927 psi | 89% | 2890 fps | 98.4% |
| Bofors RP15 | <<locked>> | 92% | 55,970 psi | 88% | 2913 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 54,114 psi | 85% | 2913 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 56,797 psi | 89% | 2923 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 56,159 psi | 88% | 2927 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,637 psi | 87% | 2861 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,694 psi | 86% | 2848 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,868 psi | 86% | 2766 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 57,043 psi | 89% | 3041 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,681 psi | 59% | 1791 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,043 psi | 89% | 2831 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,537 psi | 90% | 2831 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,318 psi | 88% | 2841 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 90% | 54,549 psi | 85% | 2910 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,182 psi | 76% | 2838 fps | 99.4% |
| Lovex S065 | <<locked>> | 82% | 57,232 psi | 90% | 2802 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,680 psi | 87% | 2808 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 54,534 psi | 85% | 2795 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,563 psi | 86% | 2838 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 48,892 psi | 77% | 2864 fps | 100% |
| Norma MRP | <<locked>> | 88% | 56,681 psi | 89% | 2940 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,521 psi | 87% | 2822 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,492 psi | 87% | 2933 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 54,520 psi | 85% | 2835 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 53,911 psi | 84% | 2864 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,609 psi | 61% | 1834 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,406 psi | 90% | 2864 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,869 psi | 88% | 2894 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 53,722 psi | 84% | 2976 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,246 psi | 90% | 3002 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 86% | 55,332 psi | 87% | 2828 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 88% | 57,334 psi | 90% | 2890 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,232 psi | 90% | 2802 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,680 psi | 87% | 2808 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,115 psi | 88% | 2762 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,927 psi | 89% | 2890 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 56,507 psi | 89% | 2818 fps | 99.5% |
| Somchem S365 | <<locked>> | 84% | 56,782 psi | 89% | 2828 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 54,128 psi | 85% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,072 psi | 89% | 2812 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,421 psi | 90% | 2844 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 56,449 psi | 88% | 2871 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 82% | 56,318 psi | 88% | 2818 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,652 psi | 89% | 2858 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,246 psi | 88% | 2943 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 94% | 56,811 psi | 89% | 2933 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 96% | 54,056 psi | 85% | 2940 fps | 99% |
| Vihtavuori N570 | <<locked>> | 98% | 54,998 psi | 86% | 2999 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,347 psi | 88% | 2762 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 53,824 psi | 84% | 2920 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,653 psi | 90% | 2861 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% | 40,698 psi | 64% | 2566 fps | 99.8% |
| Accurate 4350 | <<locked>> | 80% | 53,780 psi | 84% | 2792 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 44,425 psi | 70% | 2746 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 80% | 41,916 psi | 66% | 2684 fps | 96.8% |
| ADI AR 2209 | <<locked>> | 80% | 44,570 psi | 70% | 2687 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 39,885 psi | 63% | 2628 fps | 97.3% |
| ADI AR 2217 | <<locked>> | 84% | 33,953 psi | 53% | 2490 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 96% | 43,961 psi | 69% | 2795 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 27,209 psi | 43% | 2343 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,078 psi | 71% | 2690 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,256 psi | 80% | 2792 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,657 psi | 70% | 2684 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,495 psi | 63% | 2635 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,320 psi | 62% | 2582 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,924 psi | 53% | 2520 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,048 psi | 69% | 2743 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 44,425 psi | 70% | 2792 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 44,411 psi | 70% | 2664 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 37,797 psi | 59% | 2575 fps | 97.8% |
| Bofors RP30 | <<locked>> | 82% | 33,692 psi | 53% | 2507 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 40,495 psi | 63% | 2635 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 80% | 32,372 psi | 51% | 2448 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 80% | 42,453 psi | 67% | 2628 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,727 psi | 65% | 2615 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,240 psi | 76% | 2671 fps | 100% |
| Hodgdon Retumbo | 62.2 gr | 80% | 33,170 psi | 52% | 2552 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,152 psi | 44% | 1598 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,256 psi | 79% | 2726 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 50,778 psi | 80% | 2733 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,758 psi | 69% | 2621 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 80% | 38,624 psi | 61% | 2612 fps | 97% |
| IMR 8133 Enduron | <<locked>> | 90% | 34,519 psi | 54% | 2552 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 53,867 psi | 84% | 2756 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,388 psi | 82% | 2756 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,085 psi | 55% | 2444 fps | 99.1% |
| Norma 204 | <<locked>> | 80% | 51,010 psi | 80% | 2779 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 28,355 psi | 44% | 2402 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 42,946 psi | 67% | 2710 fps | 99.7% |
| Norma URP | <<locked>> | 80% | 52,141 psi | 82% | 2772 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,464 psi | 60% | 2621 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 80% | 51,024 psi | 80% | 2782 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,490 psi | 54% | 2503 fps | 97.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,863 psi | 45% | 1634 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,664 psi | 84% | 2812 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,141 psi | 82% | 2841 fps | 100% |
| ReloadSwiss RS 76 | 66.6 gr | 80% | 32,256 psi | 51% | 2526 fps | 98% |
| ReloadSwiss RS 80 | 72.1 gr | 86% | 36,376 psi | 57% | 2608 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 45,658 psi | 72% | 2664 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 80% | 44,150 psi | 69% | 2671 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,867 psi | 84% | 2756 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,388 psi | 82% | 2756 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,721 psi | 83% | 2710 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,816 psi | 69% | 2667 fps | 99.2% |
| Somchem S361 | <<locked>> | 80% | 46,427 psi | 73% | 2654 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 49,632 psi | 78% | 2726 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,527 psi | 70% | 2648 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 53,606 psi | 84% | 2766 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,928 psi | 61% | 2530 fps | 98.6% |
| Vihtavuori N170 | <<locked>> | 92% | 49,240 psi | 77% | 2749 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 52,779 psi | 83% | 2769 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,918 psi | 69% | 2657 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,772 psi | 67% | 2700 fps | 97.6% |
| Vihtavuori N565 | <<locked>> | 80% | 35,302 psi | 55% | 2520 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 86% | 37,913 psi | 59% | 2628 fps | 95% |
| Vihtavuori N570 | <<locked>> | 92% | 44,280 psi | 69% | 2802 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,794 psi | 83% | 2717 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,753 psi | 58% | 2635 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,988 psi | 64% | 2582 fps | 98.6% |
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 68 powders for 7 x 66 SE v. Hofe loaded with the .284 | 175gr | Speer Magnum Tip Soft Point. Hodgdon Retumbo delivers the highest muzzle velocity at 3,041 fps; across all powders the maximum-charge window runs from 1,791 fps to 3,041 fps. ADI AR 2218 gives the best case fill at 100 %, and 68 of the 68 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 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-33 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 Magnum Tip Soft Point 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.