Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .285 | 173gr | Prvi Partizan SP bullet and 67 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% | 56,260 psi | 88% | 2835 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,014 psi | 89% | 2854 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 54,201 psi | 85% | 2936 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 88% | 55,114 psi | 86% | 2943 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 86% | 54,259 psi | 85% | 2871 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 55,970 psi | 88% | 2940 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 54,143 psi | 85% | 2910 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 50,488 psi | 79% | 2949 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,388 psi | 82% | 2933 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,578 psi | 86% | 2858 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,406 psi | 90% | 2917 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,347 psi | 88% | 2933 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 54,331 psi | 85% | 2841 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 53,983 psi | 85% | 2910 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,549 psi | 85% | 2930 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,376 psi | 87% | 3005 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,739 psi | 89% | 2900 fps | 98.3% |
| Bofors RP15 | <<locked>> | 92% | 55,550 psi | 87% | 2923 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 57,464 psi | 90% | 2979 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 56,347 psi | 88% | 2933 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,695 psi | 87% | 2933 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,463 psi | 87% | 2874 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,317 psi | 85% | 2858 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,781 psi | 86% | 2779 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,782 psi | 89% | 3054 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,492 psi | 59% | 1798 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,710 psi | 89% | 2841 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,406 psi | 90% | 2848 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,014 psi | 88% | 2851 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 54,128 psi | 85% | 2920 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,950 psi | 75% | 2848 fps | 99.3% |
| Lovex S065 | <<locked>> | 82% | 56,956 psi | 89% | 2815 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,376 psi | 87% | 2818 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,696 psi | 90% | 2854 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,201 psi | 85% | 2848 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 48,602 psi | 76% | 2874 fps | 100% |
| Norma MRP | <<locked>> | 88% | 56,478 psi | 89% | 2953 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,187 psi | 86% | 2835 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,259 psi | 87% | 2943 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 54,157 psi | 85% | 2844 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,682 psi | 90% | 2933 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,595 psi | 60% | 1844 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,261 psi | 90% | 2881 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,709 psi | 87% | 2907 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,725 psi | 90% | 3048 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,913 psi | 89% | 3012 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 86% | 55,027 psi | 86% | 2838 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 88% | 57,203 psi | 90% | 2907 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,956 psi | 89% | 2815 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,376 psi | 87% | 2818 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,072 psi | 88% | 2776 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,797 psi | 89% | 2904 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 56,333 psi | 88% | 2831 fps | 99.5% |
| Somchem S365 | <<locked>> | 84% | 56,376 psi | 88% | 2838 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,421 psi | 90% | 2874 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,753 psi | 89% | 2825 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,246 psi | 90% | 2861 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 55,999 psi | 88% | 2877 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 82% | 55,999 psi | 88% | 2831 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,275 psi | 88% | 2867 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,028 psi | 88% | 2956 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 94% | 56,362 psi | 88% | 2943 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 98% | 57,624 psi | 90% | 3012 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 98% | 54,447 psi | 85% | 3005 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,231 psi | 88% | 2779 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,406 psi | 90% | 2982 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,261 psi | 90% | 2874 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% | 40,422 psi | 63% | 2572 fps | 99.8% |
| Accurate 4350 | <<locked>> | 80% | 53,432 psi | 84% | 2802 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 44,121 psi | 69% | 2753 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 80% | 41,597 psi | 65% | 2694 fps | 96.6% |
| ADI AR 2209 | <<locked>> | 80% | 44,295 psi | 69% | 2697 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 80% | 39,610 psi | 62% | 2635 fps | 97.1% |
| ADI AR 2217 | <<locked>> | 84% | 33,895 psi | 53% | 2500 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 98% | 46,905 psi | 74% | 2877 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 27,050 psi | 42% | 2346 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,140 psi | 80% | 2805 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,396 psi | 70% | 2694 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,248 psi | 63% | 2644 fps | 98.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,044 psi | 61% | 2592 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,678 psi | 53% | 2526 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,671 psi | 68% | 2749 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 44,179 psi | 69% | 2799 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 44,164 psi | 69% | 2671 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 37,565 psi | 59% | 2582 fps | 97.6% |
| Bofors RP30 | <<locked>> | 82% | 33,431 psi | 52% | 2513 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 40,248 psi | 63% | 2644 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 80% | 32,184 psi | 50% | 2454 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 80% | 42,380 psi | 66% | 2641 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,466 psi | 65% | 2621 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,182 psi | 76% | 2684 fps | 100% |
| Hodgdon Retumbo | 62.4 gr | 80% | 32,938 psi | 52% | 2556 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,166 psi | 44% | 1608 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,995 psi | 78% | 2740 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 50,473 psi | 79% | 2746 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,511 psi | 68% | 2631 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 80% | 38,363 psi | 60% | 2618 fps | 96.8% |
| IMR 8133 Enduron | <<locked>> | 90% | 34,200 psi | 54% | 2556 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 53,592 psi | 84% | 2766 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,112 psi | 82% | 2769 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,867 psi | 55% | 2454 fps | 99% |
| Norma 204 | <<locked>> | 80% | 50,705 psi | 79% | 2792 fps | 99.7% |
| Norma 217 | <<locked>> | 84% | 28,137 psi | 44% | 2405 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 42,641 psi | 67% | 2717 fps | 99.6% |
| Norma URP | <<locked>> | 80% | 51,837 psi | 81% | 2785 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,174 psi | 60% | 2628 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 80% | 50,705 psi | 79% | 2792 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,214 psi | 54% | 2510 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,892 psi | 45% | 1647 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,345 psi | 84% | 2822 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,735 psi | 81% | 2848 fps | 100% |
| ReloadSwiss RS 76 | 66.8 gr | 80% | 32,010 psi | 50% | 2533 fps | 97.7% |
| ReloadSwiss RS 80 | 74.1 gr | 88% | 39,001 psi | 61% | 2684 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 45,411 psi | 71% | 2674 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 80% | 43,859 psi | 69% | 2680 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,592 psi | 84% | 2766 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,112 psi | 82% | 2769 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,475 psi | 82% | 2723 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,526 psi | 68% | 2677 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 46,166 psi | 72% | 2664 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 49,313 psi | 77% | 2736 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,251 psi | 69% | 2657 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 53,330 psi | 84% | 2776 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,682 psi | 61% | 2539 fps | 98.5% |
| Vihtavuori N170 | <<locked>> | 94% | 52,373 psi | 82% | 2818 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 52,489 psi | 82% | 2779 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,627 psi | 68% | 2667 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,496 psi | 67% | 2710 fps | 97.5% |
| Vihtavuori N565 | <<locked>> | 80% | 35,186 psi | 55% | 2533 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 40,292 psi | 63% | 2697 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 94% | 47,253 psi | 74% | 2877 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,460 psi | 82% | 2730 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,405 psi | 57% | 2641 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,741 psi | 64% | 2589 fps | 98.4% |
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 67 powders for 7 x 66 SE v. Hofe loaded with the .285 | 173gr | Prvi Partizan SP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,054 fps; across all powders the maximum-charge window runs from 1,798 fps to 3,054 fps. ADI AR 2218 gives the best case fill at 100 %, and 67 of the 67 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 1:12.5 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 .285 | 173gr | Prvi Partizan SP 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.