Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 177gr | Brenneke TIG 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% | 57,116 psi | 90% | 2818 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,740 psi | 90% | 2835 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 55,013 psi | 86% | 2920 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 55,767 psi | 87% | 2927 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 86% | 54,984 psi | 86% | 2851 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 56,840 psi | 89% | 2923 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 55,042 psi | 86% | 2897 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,227 psi | 80% | 2940 fps | 97.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,359 psi | 84% | 2920 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,027 psi | 86% | 2848 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,274 psi | 87% | 2835 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 54,433 psi | 85% | 2841 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,203 psi | 90% | 2917 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,143 psi | 86% | 2825 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,911 psi | 86% | 2894 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,535 psi | 87% | 2910 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,318 psi | 88% | 2992 fps | 98.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 47,587 psi | 75% | 2838 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,319 psi | 90% | 2884 fps | 98.6% |
| Bofors RP15 | <<locked>> | 92% | 56,376 psi | 88% | 2907 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 54,578 psi | 86% | 2907 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 57,203 psi | 90% | 2917 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 56,637 psi | 89% | 2920 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,985 psi | 88% | 2854 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,056 psi | 86% | 2841 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,448 psi | 87% | 2759 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 57,624 psi | 90% | 3035 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,565 psi | 59% | 1778 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,334 psi | 90% | 2822 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 54,389 psi | 85% | 2776 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,681 psi | 89% | 2835 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 90% | 55,013 psi | 86% | 2904 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,878 psi | 77% | 2838 fps | 99.5% |
| Lovex S070 | <<locked>> | 82% | 55,970 psi | 88% | 2799 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,187 psi | 86% | 2792 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,882 psi | 86% | 2828 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 49,661 psi | 78% | 2861 fps | 100% |
| Norma MRP | <<locked>> | 88% | 57,145 psi | 90% | 2933 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,869 psi | 88% | 2812 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,014 psi | 88% | 2927 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 54,853 psi | 86% | 2825 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,375 psi | 85% | 2858 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,522 psi | 60% | 1821 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,521 psi | 89% | 2887 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,259 psi | 85% | 2969 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 53,577 psi | 84% | 2933 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 86% | 55,695 psi | 87% | 2822 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 88% | 57,740 psi | 90% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,970 psi | 88% | 2799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,637 psi | 89% | 2756 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,319 psi | 90% | 2881 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 57,058 psi | 89% | 2815 fps | 99.6% |
| Somchem S365 | <<locked>> | 84% | 57,145 psi | 90% | 2815 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 54,476 psi | 85% | 2802 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,406 psi | 90% | 2802 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 54,302 psi | 85% | 2789 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 56,884 psi | 89% | 2867 fps | 97% |
| Vihtavuori N550 | <<locked>> | 82% | 56,652 psi | 89% | 2812 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,087 psi | 89% | 2848 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,666 psi | 89% | 2936 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 94% | 57,305 psi | 90% | 2927 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 96% | 54,549 psi | 85% | 2936 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 98% | 55,550 psi | 87% | 2995 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,695 psi | 89% | 2756 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,375 psi | 85% | 2910 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,215 psi | 85% | 2802 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% | 41,002 psi | 64% | 2559 fps | 99.9% |
| Accurate 4350 | <<locked>> | 80% | 54,114 psi | 85% | 2782 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 44,788 psi | 70% | 2740 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 80% | 42,264 psi | 66% | 2680 fps | 97% |
| ADI AR 2209 | <<locked>> | 80% | 44,846 psi | 70% | 2680 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 40,335 psi | 63% | 2628 fps | 97.6% |
| ADI AR 2217 | <<locked>> | 84% | 34,374 psi | 54% | 2490 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 96% | 44,338 psi | 69% | 2799 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 27,427 psi | 43% | 2339 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,368 psi | 71% | 2684 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,808 psi | 81% | 2785 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,947 psi | 70% | 2677 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,988 psi | 64% | 2635 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,639 psi | 62% | 2575 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,200 psi | 54% | 2513 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,454 psi | 70% | 2736 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 45,078 psi | 71% | 2792 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 98% | 44,309 psi | 69% | 2776 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 42,003 psi | 66% | 2602 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 38,087 psi | 60% | 2569 fps | 98% |
| Bofors RP30 | <<locked>> | 80% | 31,778 psi | 50% | 2448 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 40,988 psi | 64% | 2635 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 32,619 psi | 51% | 2444 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 42,931 psi | 67% | 2628 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,192 psi | 66% | 2612 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,762 psi | 76% | 2664 fps | 100% |
| Hodgdon Retumbo | 62.1 gr | 80% | 33,431 psi | 52% | 2549 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,210 psi | 44% | 1591 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,560 psi | 79% | 2720 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 51,082 psi | 80% | 2726 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,005 psi | 69% | 2615 fps | 98% |
| IMR 7828 SSC | <<locked>> | 80% | 39,088 psi | 61% | 2608 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 88% | 32,590 psi | 51% | 2490 fps | 95.2% |
| Lovex S070 | <<locked>> | 80% | 52,678 psi | 83% | 2749 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,317 psi | 55% | 2441 fps | 99.2% |
| Norma 204 | <<locked>> | 80% | 51,329 psi | 80% | 2772 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 28,631 psi | 45% | 2398 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 43,308 psi | 68% | 2703 fps | 99.8% |
| Norma URP | <<locked>> | 80% | 52,431 psi | 82% | 2762 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,769 psi | 61% | 2615 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 80% | 51,343 psi | 80% | 2772 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,766 psi | 54% | 2500 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,935 psi | 45% | 1627 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,504 psi | 82% | 2831 fps | 100% |
| ReloadSwiss RS 76 | 66.5 gr | 80% | 32,547 psi | 51% | 2526 fps | 98.2% |
| ReloadSwiss RS 80 | 72.1 gr | 86% | 36,898 psi | 58% | 2608 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 45,934 psi | 72% | 2657 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 80% | 44,469 psi | 70% | 2667 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 52,678 psi | 83% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,040 psi | 83% | 2703 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,121 psi | 69% | 2661 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 46,731 psi | 73% | 2648 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 50,009 psi | 78% | 2717 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,020 psi | 71% | 2644 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 53,925 psi | 85% | 2756 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,189 psi | 61% | 2526 fps | 98.8% |
| Vihtavuori N170 | <<locked>> | 92% | 49,603 psi | 78% | 2746 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 53,098 psi | 83% | 2759 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,251 psi | 69% | 2651 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,120 psi | 68% | 2697 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 80% | 35,737 psi | 56% | 2520 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 86% | 38,261 psi | 60% | 2628 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 92% | 44,701 psi | 70% | 2799 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,113 psi | 83% | 2707 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,173 psi | 58% | 2631 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,278 psi | 65% | 2575 fps | 98.8% |
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 66 powders for 7 x 66 SE v. Hofe loaded with the .284 | 177gr | Brenneke TIG. Hodgdon Retumbo delivers the highest muzzle velocity at 3,035 fps; across all powders the maximum-charge window runs from 1,778 fps to 3,035 fps. ADI AR 2218 gives the best case fill at 100 %, and 66 of the 66 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 177.0 gr projectile in 0.284" calls for a 1:11.5 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 | 177gr | Brenneke TIG 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.