Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 175gr | Nosler Partition bullet and 71 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% | 55,201 psi | 87% | 2802 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,840 psi | 88% | 2818 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 56,666 psi | 89% | 2956 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 90% | 57,537 psi | 90% | 2963 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 88% | 56,681 psi | 89% | 2884 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 54,679 psi | 86% | 2900 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,608 psi | 89% | 2927 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 49,037 psi | 77% | 2897 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,981 psi | 80% | 2894 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,043 psi | 89% | 2871 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,333 psi | 88% | 2877 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,071 psi | 86% | 2894 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,739 psi | 89% | 2854 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,391 psi | 88% | 2927 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,188 psi | 90% | 2946 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,621 psi | 84% | 2959 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,521 psi | 87% | 2858 fps | 98.1% |
| Bofors RP15 | <<locked>> | 92% | 54,273 psi | 85% | 2884 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 56,086 psi | 88% | 2940 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 55,071 psi | 86% | 2894 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 57,377 psi | 90% | 2815 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,346 psi | 85% | 2894 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 57,217 psi | 90% | 2871 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,215 psi | 85% | 2835 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,913 psi | 89% | 2874 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,043 psi | 89% | 2789 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,317 psi | 87% | 3012 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,507 psi | 59% | 1778 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,811 psi | 87% | 2808 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,159 psi | 88% | 2808 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,056 psi | 86% | 2815 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 92% | 56,782 psi | 89% | 2940 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,659 psi | 73% | 2808 fps | 99.1% |
| Lovex S065 | <<locked>> | 82% | 56,130 psi | 88% | 2782 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 54,592 psi | 86% | 2785 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,681 psi | 89% | 2822 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,869 psi | 89% | 2867 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 47,268 psi | 74% | 2835 fps | 100% |
| Norma MRP | <<locked>> | 88% | 54,897 psi | 86% | 2910 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,331 psi | 85% | 2802 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 53,650 psi | 84% | 2900 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 56,681 psi | 89% | 2861 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,101 psi | 88% | 2890 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,450 psi | 60% | 1821 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,043 psi | 88% | 2841 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,476 psi | 85% | 2871 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,912 psi | 88% | 3005 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,230 psi | 87% | 2969 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 88% | 57,450 psi | 90% | 2854 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 88% | 56,043 psi | 88% | 2867 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 57,377 psi | 90% | 2815 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,130 psi | 88% | 2782 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,592 psi | 86% | 2785 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,143 psi | 86% | 2740 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,637 psi | 87% | 2864 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 55,288 psi | 87% | 2795 fps | 99.4% |
| Somchem S365 | <<locked>> | 84% | 55,288 psi | 87% | 2802 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,347 psi | 88% | 2838 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 55,695 psi | 87% | 2789 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,101 psi | 88% | 2822 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 54,694 psi | 86% | 2838 fps | 96.2% |
| Vihtavuori N550 | <<locked>> | 82% | 55,042 psi | 86% | 2799 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,288 psi | 87% | 2835 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,549 psi | 85% | 2910 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 94% | 55,027 psi | 86% | 2904 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 98% | 55,912 psi | 88% | 2966 fps | 99.2% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 56,985 psi | 89% | 3031 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 54,969 psi | 86% | 2743 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,435 psi | 90% | 2874 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 55,608 psi | 87% | 2943 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,057 psi | 88% | 2835 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% | 39,450 psi | 62% | 2536 fps | 99.7% |
| Accurate 4350 | <<locked>> | 80% | 52,257 psi | 82% | 2762 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 43,134 psi | 68% | 2717 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 80% | 40,567 psi | 64% | 2654 fps | 96.3% |
| ADI AR 2209 | <<locked>> | 80% | 43,497 psi | 68% | 2661 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 80% | 38,899 psi | 61% | 2602 fps | 96.9% |
| ADI AR 2217 | <<locked>> | 86% | 35,317 psi | 55% | 2520 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 98% | 45,658 psi | 72% | 2825 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 82% | 28,268 psi | 44% | 2372 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,140 psi | 79% | 2769 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,424 psi | 68% | 2654 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,436 psi | 62% | 2612 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,174 psi | 60% | 2556 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,982 psi | 52% | 2493 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,670 psi | 67% | 2717 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 46,151 psi | 72% | 2825 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,439 psi | 68% | 2635 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 36,767 psi | 58% | 2549 fps | 97.4% |
| Bofors RP30 | <<locked>> | 82% | 32,547 psi | 51% | 2477 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 39,436 psi | 62% | 2612 fps | 98.3% |
| Bofors RP7 | <<locked>> | 80% | 53,853 psi | 84% | 2762 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 33,591 psi | 53% | 2477 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 53,664 psi | 84% | 2822 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,495 psi | 65% | 2605 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,756 psi | 64% | 2589 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,224 psi | 74% | 2651 fps | 100% |
| Hodgdon Retumbo | 60.7 gr | 80% | 32,271 psi | 51% | 2523 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,108 psi | 44% | 1588 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,211 psi | 77% | 2703 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,385 psi | 77% | 2707 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,815 psi | 67% | 2598 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 80% | 37,608 psi | 59% | 2582 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 90% | 33,330 psi | 52% | 2520 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 52,750 psi | 83% | 2733 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,271 psi | 80% | 2733 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,026 psi | 53% | 2418 fps | 98.8% |
| Norma 204 | <<locked>> | 80% | 49,763 psi | 78% | 2753 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 29,298 psi | 46% | 2428 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 41,655 psi | 65% | 2680 fps | 99.5% |
| Norma URP | <<locked>> | 80% | 50,923 psi | 80% | 2749 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,260 psi | 58% | 2589 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 80% | 49,734 psi | 78% | 2756 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,417 psi | 52% | 2474 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,834 psi | 45% | 1627 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,301 psi | 82% | 2789 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,734 psi | 80% | 2815 fps | 100% |
| ReloadSwiss RS 76 | 64.9 gr | 80% | 31,183 psi | 49% | 2493 fps | 97.4% |
| ReloadSwiss RS 80 | 72 gr | 88% | 37,826 psi | 59% | 2641 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 44,614 psi | 70% | 2638 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 80% | 43,047 psi | 67% | 2648 fps | 99% |
| Rottweil R 907 | <<locked>> | 80% | 53,853 psi | 84% | 2762 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,750 psi | 83% | 2733 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,271 psi | 80% | 2733 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,721 psi | 81% | 2687 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,714 psi | 67% | 2641 fps | 98.9% |
| Somchem S361 | <<locked>> | 80% | 45,411 psi | 71% | 2628 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 48,356 psi | 76% | 2703 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,482 psi | 68% | 2625 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 52,228 psi | 82% | 2736 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,811 psi | 59% | 2503 fps | 98.2% |
| Vihtavuori N170 | <<locked>> | 94% | 51,314 psi | 80% | 2779 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 51,474 psi | 81% | 2743 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,525 psi | 67% | 2631 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,553 psi | 65% | 2674 fps | 97.2% |
| Vihtavuori N565 | <<locked>> | 80% | 34,330 psi | 54% | 2497 fps | 95% |
| Vihtavuori N568 | <<locked>> | 88% | 39,247 psi | 62% | 2657 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 94% | 46,006 psi | 72% | 2835 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,401 psi | 81% | 2694 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,896 psi | 84% | 2822 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,259 psi | 55% | 2608 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,856 psi | 62% | 2556 fps | 98.2% |
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 71 powders for 7 x 66 SE v. Hofe loaded with the .284 | 175gr | Nosler Partition. Vihtavuori N570 delivers the highest muzzle velocity at 3,031 fps; across all powders the maximum-charge window runs from 1,778 fps to 3,031 fps. ADI AR 2217 gives the best case fill at 100 %, and 71 of the 71 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 1:10.5 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 | 175gr | Nosler Partition 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.