Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 174gr | 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 Vihtavuori N570.
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% | 56,130 psi | 88% | 2825 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,029 psi | 89% | 2844 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 54,766 psi | 86% | 2930 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 88% | 57,682 psi | 90% | 2913 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 55,840 psi | 88% | 2930 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 54,056 psi | 85% | 2900 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 50,067 psi | 78% | 2933 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,083 psi | 82% | 2920 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 54,186 psi | 85% | 2854 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 54,186 psi | 85% | 2854 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,302 psi | 85% | 2844 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,261 psi | 90% | 2904 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,217 psi | 88% | 2923 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,725 psi | 90% | 2881 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,522 psi | 90% | 2949 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,418 psi | 85% | 2920 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,911 psi | 86% | 2989 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,478 psi | 89% | 2890 fps | 98.3% |
| Bofors RP15 | <<locked>> | 92% | 55,405 psi | 87% | 2910 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 57,377 psi | 90% | 2969 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 56,217 psi | 88% | 2923 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,593 psi | 87% | 2923 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,347 psi | 87% | 2864 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,157 psi | 85% | 2844 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,563 psi | 86% | 2769 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,420 psi | 88% | 3041 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,652 psi | 59% | 1795 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,536 psi | 89% | 2831 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,188 psi | 90% | 2835 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,869 psi | 88% | 2841 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 53,998 psi | 85% | 2910 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,630 psi | 75% | 2835 fps | 99.3% |
| Lovex S065 | <<locked>> | 82% | 56,942 psi | 89% | 2805 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,376 psi | 87% | 2808 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,595 psi | 90% | 2844 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,056 psi | 85% | 2835 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 48,298 psi | 76% | 2858 fps | 100% |
| Norma MRP | <<locked>> | 88% | 56,101 psi | 88% | 2940 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,187 psi | 86% | 2825 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,882 psi | 86% | 2930 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 84% | 57,638 psi | 90% | 2887 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,319 psi | 90% | 2917 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,595 psi | 60% | 1837 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,058 psi | 89% | 2867 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,506 psi | 87% | 2897 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,435 psi | 90% | 3035 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,623 psi | 89% | 2999 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 86% | 54,839 psi | 86% | 2828 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 88% | 57,014 psi | 89% | 2894 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,942 psi | 89% | 2805 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,376 psi | 87% | 2808 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,898 psi | 88% | 2762 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,623 psi | 89% | 2890 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 56,260 psi | 88% | 2822 fps | 99.5% |
| Somchem S365 | <<locked>> | 84% | 56,159 psi | 88% | 2825 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,261 psi | 90% | 2861 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,753 psi | 89% | 2815 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,145 psi | 90% | 2851 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 55,970 psi | 88% | 2871 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 82% | 55,825 psi | 87% | 2818 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,086 psi | 88% | 2854 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,666 psi | 87% | 2943 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 94% | 56,260 psi | 88% | 2933 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 98% | 57,348 psi | 90% | 2999 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 98% | 54,433 psi | 85% | 2995 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,057 psi | 88% | 2769 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,261 psi | 90% | 2972 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,130 psi | 90% | 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% | 40,234 psi | 63% | 2562 fps | 99.8% |
| Accurate 4350 | <<locked>> | 80% | 53,200 psi | 83% | 2789 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,466 psi | 65% | 2684 fps | 96.6% |
| ADI AR 2209 | <<locked>> | 80% | 44,266 psi | 69% | 2687 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 80% | 39,595 psi | 62% | 2628 fps | 97.1% |
| ADI AR 2217 | <<locked>> | 84% | 33,721 psi | 53% | 2487 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 98% | 46,717 psi | 73% | 2861 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 26,890 psi | 42% | 2336 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,614 psi | 70% | 2687 fps | 99.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,614 psi | 70% | 2687 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,908 psi | 80% | 2792 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,208 psi | 69% | 2680 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,190 psi | 63% | 2638 fps | 98.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,001 psi | 61% | 2582 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,649 psi | 53% | 2516 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,482 psi | 68% | 2740 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 43,947 psi | 69% | 2789 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 44,019 psi | 69% | 2661 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 37,347 psi | 59% | 2572 fps | 97.6% |
| Bofors RP30 | <<locked>> | 82% | 33,388 psi | 52% | 2507 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 40,190 psi | 63% | 2638 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 80% | 32,010 psi | 50% | 2444 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 80% | 42,192 psi | 66% | 2628 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,466 psi | 65% | 2615 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,935 psi | 75% | 2671 fps | 100% |
| Hodgdon Retumbo | 61.9 gr | 80% | 32,779 psi | 51% | 2546 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,268 psi | 44% | 1601 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,009 psi | 78% | 2730 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 50,256 psi | 79% | 2733 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,511 psi | 68% | 2625 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 80% | 38,334 psi | 60% | 2608 fps | 96.8% |
| IMR 8133 Enduron | <<locked>> | 90% | 34,069 psi | 53% | 2546 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 53,577 psi | 84% | 2756 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,909 psi | 81% | 2756 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,809 psi | 55% | 2444 fps | 99% |
| Norma 204 | <<locked>> | 80% | 50,488 psi | 79% | 2779 fps | 99.7% |
| Norma 217 | <<locked>> | 84% | 27,992 psi | 44% | 2395 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 42,453 psi | 67% | 2703 fps | 99.6% |
| Norma URP | <<locked>> | 80% | 51,576 psi | 81% | 2772 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,159 psi | 60% | 2618 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 80% | 50,502 psi | 79% | 2779 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,040 psi | 53% | 2500 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,979 psi | 45% | 1640 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,374 psi | 84% | 2815 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,561 psi | 81% | 2838 fps | 100% |
| ReloadSwiss RS 76 | 66.3 gr | 80% | 31,865 psi | 50% | 2520 fps | 97.7% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 38,754 psi | 61% | 2667 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 45,179 psi | 71% | 2661 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 80% | 43,642 psi | 68% | 2667 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,577 psi | 84% | 2756 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,909 psi | 81% | 2756 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,286 psi | 82% | 2710 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,337 psi | 68% | 2664 fps | 99% |
| Somchem S361 | <<locked>> | 80% | 46,006 psi | 72% | 2651 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 49,313 psi | 77% | 2726 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,222 psi | 69% | 2648 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 53,098 psi | 83% | 2762 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,508 psi | 60% | 2526 fps | 98.5% |
| Vihtavuori N170 | <<locked>> | 94% | 52,127 psi | 82% | 2808 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 52,489 psi | 82% | 2772 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,395 psi | 68% | 2654 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,308 psi | 66% | 2697 fps | 97.4% |
| Vihtavuori N565 | <<locked>> | 80% | 35,027 psi | 55% | 2520 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 40,190 psi | 63% | 2687 fps | 95.8% |
| Vihtavuori N570 | 75.5 gr | 94% | 46,949 psi | 74% | 2864 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,286 psi | 82% | 2717 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,187 psi | 57% | 2631 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,553 psi | 64% | 2579 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 68 powders for 7 x 66 SE v. Hofe loaded with the .284 | 174gr | Prvi Partizan FMJ BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,041 fps; across all powders the maximum-charge window runs from 1,795 fps to 3,041 fps. ADI AR 2218 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 174.0 gr projectile in 0.284" calls for a 1:12.0 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, Vihtavuori N570 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 174gr | 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.