Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .285 | 173gr | Prvi Partizan FMJ BT 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% | 55,941 psi | 88% | 2831 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,594 psi | 89% | 2844 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 57,653 psi | 90% | 2989 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 54,592 psi | 86% | 2933 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 88% | 57,493 psi | 90% | 2917 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 55,390 psi | 87% | 2930 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,392 psi | 90% | 2956 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 49,922 psi | 78% | 2933 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,895 psi | 81% | 2923 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 57,522 psi | 90% | 2913 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,157 psi | 85% | 2848 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,869 psi | 89% | 2904 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,767 psi | 87% | 2923 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,537 psi | 90% | 2884 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,334 psi | 90% | 2956 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 53,983 psi | 85% | 2920 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,665 psi | 86% | 2992 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,115 psi | 88% | 2890 fps | 98.2% |
| Bofors RP15 | <<locked>> | 92% | 54,969 psi | 86% | 2910 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 56,898 psi | 89% | 2972 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 55,767 psi | 87% | 2923 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,143 psi | 86% | 2923 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,926 psi | 86% | 2864 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,580 psi | 90% | 2904 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,740 psi | 90% | 2818 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,217 psi | 88% | 3045 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,492 psi | 59% | 1795 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,376 psi | 88% | 2835 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,797 psi | 89% | 2835 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,724 psi | 87% | 2844 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 92% | 57,493 psi | 90% | 2969 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,413 psi | 74% | 2838 fps | 99.2% |
| Lovex S065 | <<locked>> | 82% | 56,579 psi | 89% | 2808 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,042 psi | 86% | 2812 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,392 psi | 90% | 2848 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,653 psi | 90% | 2897 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 48,066 psi | 75% | 2864 fps | 100% |
| Norma MRP | <<locked>> | 88% | 55,883 psi | 88% | 2943 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,824 psi | 86% | 2828 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,636 psi | 86% | 2933 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 84% | 57,479 psi | 90% | 2894 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,855 psi | 89% | 2920 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,421 psi | 60% | 1837 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,666 psi | 89% | 2871 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,100 psi | 86% | 2897 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,913 psi | 89% | 3035 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,130 psi | 88% | 2999 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 86% | 54,447 psi | 85% | 2828 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 56,623 psi | 89% | 2897 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,579 psi | 89% | 2808 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,042 psi | 86% | 2812 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,521 psi | 87% | 2766 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,217 psi | 88% | 2894 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 55,898 psi | 88% | 2825 fps | 99.4% |
| Somchem S365 | <<locked>> | 84% | 55,956 psi | 88% | 2831 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,101 psi | 89% | 2867 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,376 psi | 88% | 2818 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,724 psi | 89% | 2851 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 55,564 psi | 87% | 2867 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 82% | 55,651 psi | 87% | 2825 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,898 psi | 88% | 2861 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,477 psi | 87% | 2946 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 94% | 55,796 psi | 87% | 2933 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 98% | 56,884 psi | 89% | 2999 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 98% | 53,940 psi | 85% | 2995 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,680 psi | 87% | 2769 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,710 psi | 89% | 2972 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,724 psi | 89% | 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% | 40,089 psi | 63% | 2566 fps | 99.7% |
| Accurate 4350 | <<locked>> | 80% | 53,026 psi | 83% | 2795 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 43,569 psi | 68% | 2740 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 80% | 41,089 psi | 64% | 2680 fps | 96.4% |
| ADI AR 2209 | <<locked>> | 80% | 43,947 psi | 69% | 2690 fps | 99% |
| ADI AR 2213 | <<locked>> | 80% | 39,305 psi | 62% | 2628 fps | 97% |
| ADI AR 2217 | <<locked>> | 84% | 33,475 psi | 52% | 2487 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 98% | 46,340 psi | 73% | 2861 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 82% | 28,529 psi | 45% | 2395 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,454 psi | 70% | 2690 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,720 psi | 79% | 2799 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,048 psi | 69% | 2684 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,885 psi | 63% | 2638 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,667 psi | 61% | 2582 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,373 psi | 52% | 2516 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,265 psi | 68% | 2743 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 43,758 psi | 69% | 2792 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,947 psi | 69% | 2664 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 37,188 psi | 58% | 2575 fps | 97.5% |
| Bofors RP30 | <<locked>> | 82% | 33,098 psi | 52% | 2507 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 39,885 psi | 63% | 2638 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 80% | 31,894 psi | 50% | 2444 fps | 95% |
| Hodgdon H4831 | <<locked>> | 80% | 41,872 psi | 66% | 2628 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,147 psi | 64% | 2615 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,761 psi | 75% | 2677 fps | 100% |
| Hodgdon Retumbo | 61.9 gr | 80% | 32,634 psi | 51% | 2549 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,108 psi | 44% | 1604 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,647 psi | 78% | 2730 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 50,096 psi | 79% | 2736 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,221 psi | 68% | 2625 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 80% | 38,029 psi | 60% | 2608 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 90% | 33,924 psi | 53% | 2546 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 53,229 psi | 83% | 2759 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,750 psi | 81% | 2762 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,505 psi | 54% | 2444 fps | 98.9% |
| Norma 204 | <<locked>> | 80% | 50,357 psi | 79% | 2782 fps | 99.7% |
| Norma 217 | <<locked>> | 86% | 29,776 psi | 47% | 2454 fps | 96% |
| Norma MRP | <<locked>> | 80% | 42,090 psi | 66% | 2703 fps | 99.6% |
| Norma URP | <<locked>> | 80% | 51,445 psi | 81% | 2776 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,840 psi | 59% | 2618 fps | 97% |
| Ramshot Hunter | <<locked>> | 80% | 50,372 psi | 79% | 2785 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,895 psi | 53% | 2500 fps | 97.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,819 psi | 45% | 1640 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,953 psi | 83% | 2818 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,358 psi | 80% | 2841 fps | 100% |
| ReloadSwiss RS 76 | 66.2 gr | 80% | 31,604 psi | 50% | 2520 fps | 97.5% |
| ReloadSwiss RS 80 | 73.5 gr | 88% | 38,566 psi | 60% | 2671 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 45,063 psi | 71% | 2664 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 80% | 43,511 psi | 68% | 2671 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,229 psi | 83% | 2759 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,750 psi | 81% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,141 psi | 82% | 2713 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,163 psi | 68% | 2667 fps | 99% |
| Somchem S361 | <<locked>> | 80% | 45,890 psi | 72% | 2657 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 48,892 psi | 77% | 2730 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,918 psi | 69% | 2651 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 52,924 psi | 83% | 2766 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,377 psi | 60% | 2533 fps | 98.4% |
| Vihtavuori N170 | <<locked>> | 94% | 51,953 psi | 81% | 2812 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 52,127 psi | 82% | 2772 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,236 psi | 68% | 2661 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,959 psi | 66% | 2697 fps | 97.3% |
| Vihtavuori N565 | <<locked>> | 80% | 34,722 psi | 54% | 2520 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 88% | 39,813 psi | 62% | 2684 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 94% | 46,789 psi | 73% | 2867 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,938 psi | 81% | 2720 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,955 psi | 56% | 2635 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,408 psi | 63% | 2582 fps | 98.3% |
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 .285 | 173gr | Prvi Partizan FMJ BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,045 fps; across all powders the maximum-charge window runs from 1,795 fps to 3,045 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 173.0 gr projectile in 0.285" calls for a 1:12.0 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 .285 | 173gr | Prvi Partizan FMJ BT 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.