Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 180gr | Berger BT Target 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% | 55,825 psi | 87% | 2772 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,840 psi | 89% | 2792 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 57,638 psi | 90% | 2933 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 54,636 psi | 86% | 2881 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 88% | 57,493 psi | 90% | 2861 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 55,608 psi | 87% | 2877 fps | 99.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,464 psi | 90% | 2904 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 49,879 psi | 78% | 2884 fps | 97.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,793 psi | 81% | 2871 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 54,201 psi | 85% | 2805 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,288 psi | 85% | 2792 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,130 psi | 90% | 2851 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,956 psi | 88% | 2871 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,406 psi | 90% | 2825 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,203 psi | 90% | 2897 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,244 psi | 85% | 2867 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,708 psi | 86% | 2940 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,333 psi | 88% | 2838 fps | 98.4% |
| Bofors RP15 | <<locked>> | 92% | 55,158 psi | 86% | 2858 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 56,971 psi | 89% | 2917 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 55,956 psi | 88% | 2871 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,129 psi | 86% | 2867 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,042 psi | 86% | 2808 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,740 psi | 90% | 2851 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,346 psi | 85% | 2717 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,173 psi | 88% | 2986 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,536 psi | 59% | 1752 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,434 psi | 88% | 2779 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,855 psi | 89% | 2779 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,753 psi | 87% | 2792 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 92% | 57,522 psi | 90% | 2913 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,471 psi | 74% | 2789 fps | 99.4% |
| Lovex S065 | <<locked>> | 82% | 56,710 psi | 89% | 2753 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,201 psi | 87% | 2756 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,305 psi | 90% | 2792 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,624 psi | 90% | 2841 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 48,153 psi | 75% | 2812 fps | 100% |
| Norma MRP | <<locked>> | 88% | 55,898 psi | 88% | 2887 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,969 psi | 86% | 2772 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,708 psi | 86% | 2877 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 84% | 57,450 psi | 90% | 2835 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,956 psi | 89% | 2864 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,508 psi | 60% | 1795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,826 psi | 89% | 2815 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,347 psi | 87% | 2844 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,956 psi | 89% | 2979 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,347 psi | 88% | 2949 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 86% | 54,563 psi | 86% | 2772 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 88% | 56,855 psi | 89% | 2844 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,710 psi | 89% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,201 psi | 87% | 2756 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,738 psi | 87% | 2710 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,449 psi | 88% | 2838 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 56,057 psi | 88% | 2772 fps | 99.6% |
| Somchem S365 | <<locked>> | 84% | 56,043 psi | 88% | 2772 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,174 psi | 90% | 2812 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,594 psi | 89% | 2762 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,710 psi | 89% | 2795 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 55,695 psi | 87% | 2818 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 82% | 55,724 psi | 87% | 2769 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,130 psi | 88% | 2805 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,477 psi | 87% | 2890 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 94% | 56,043 psi | 88% | 2881 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 98% | 56,913 psi | 89% | 2946 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 98% | 53,911 psi | 84% | 2943 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,724 psi | 87% | 2713 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,913 psi | 89% | 2920 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,927 psi | 89% | 2808 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% | 40,205 psi | 63% | 2516 fps | 99.8% |
| Accurate 4350 | <<locked>> | 80% | 53,171 psi | 83% | 2740 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 43,801 psi | 69% | 2694 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 80% | 41,220 psi | 65% | 2635 fps | 96.8% |
| ADI AR 2209 | <<locked>> | 80% | 44,034 psi | 69% | 2638 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 39,436 psi | 62% | 2582 fps | 97.4% |
| ADI AR 2217 | <<locked>> | 84% | 33,663 psi | 53% | 2448 fps | 95.6% |
| ADI AR 2218 | <<locked>> | 98% | 46,398 psi | 73% | 2815 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 26,890 psi | 42% | 2300 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,570 psi | 70% | 2641 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,763 psi | 80% | 2743 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,164 psi | 69% | 2635 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,045 psi | 63% | 2589 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,914 psi | 61% | 2536 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,475 psi | 52% | 2474 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,453 psi | 68% | 2694 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 43,758 psi | 69% | 2743 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,990 psi | 69% | 2615 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 37,289 psi | 58% | 2526 fps | 97.8% |
| Bofors RP30 | <<locked>> | 82% | 33,301 psi | 52% | 2464 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 40,045 psi | 63% | 2589 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 80% | 32,010 psi | 50% | 2405 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 80% | 42,047 psi | 66% | 2582 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,292 psi | 65% | 2569 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,790 psi | 75% | 2621 fps | 100% |
| Hodgdon Retumbo | 60.2 gr | 80% | 32,764 psi | 51% | 2507 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,253 psi | 44% | 1565 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,763 psi | 78% | 2677 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 50,183 psi | 79% | 2684 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,294 psi | 68% | 2575 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 80% | 38,145 psi | 60% | 2562 fps | 97.1% |
| IMR 8133 Enduron | <<locked>> | 90% | 33,968 psi | 53% | 2503 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 53,505 psi | 84% | 2707 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,837 psi | 81% | 2707 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,650 psi | 54% | 2402 fps | 99.1% |
| Norma 204 | <<locked>> | 80% | 50,357 psi | 79% | 2730 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 27,905 psi | 44% | 2356 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 42,351 psi | 66% | 2657 fps | 99.7% |
| Norma URP | <<locked>> | 80% | 51,517 psi | 81% | 2723 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,869 psi | 59% | 2572 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 80% | 50,372 psi | 79% | 2730 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,011 psi | 53% | 2457 fps | 97.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,993 psi | 45% | 1604 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,069 psi | 83% | 2762 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,517 psi | 81% | 2789 fps | 100% |
| ReloadSwiss RS 76 | 64.4 gr | 80% | 31,720 psi | 50% | 2480 fps | 98% |
| ReloadSwiss RS 80 | 69.8 gr | 86% | 35,795 psi | 56% | 2562 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 45,136 psi | 71% | 2615 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 80% | 43,598 psi | 68% | 2621 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,505 psi | 84% | 2707 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,837 psi | 81% | 2707 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,257 psi | 82% | 2661 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,294 psi | 68% | 2618 fps | 99.2% |
| Somchem S361 | <<locked>> | 80% | 45,992 psi | 72% | 2608 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 49,037 psi | 77% | 2677 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,077 psi | 69% | 2602 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 53,055 psi | 83% | 2713 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,493 psi | 60% | 2484 fps | 98.6% |
| Vihtavuori N170 | <<locked>> | 92% | 48,559 psi | 76% | 2700 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 52,315 psi | 82% | 2720 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,308 psi | 68% | 2608 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,221 psi | 66% | 2654 fps | 97.7% |
| Vihtavuori N565 | <<locked>> | 80% | 34,896 psi | 55% | 2477 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 86% | 37,260 psi | 58% | 2579 fps | 95% |
| Vihtavuori N570 | <<locked>> | 92% | 43,540 psi | 68% | 2749 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,083 psi | 82% | 2664 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,056 psi | 56% | 2585 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,393 psi | 63% | 2533 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 | 180gr | Berger BT Target. Hodgdon Retumbo delivers the highest muzzle velocity at 2,986 fps; across all powders the maximum-charge window runs from 1,752 fps to 2,986 fps. ADI AR 2217 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 180.0 gr projectile in 0.284" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, 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 | 180gr | Berger BT Target 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.