Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 174gr | 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 90% | 55,840 psi | 88% | 2818 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,405 psi | 88% | 2835 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 54,505 psi | 85% | 2923 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 88% | 57,392 psi | 90% | 2907 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 55,303 psi | 87% | 2917 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,348 psi | 90% | 2949 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 49,763 psi | 78% | 2923 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,648 psi | 81% | 2910 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 57,406 psi | 90% | 2900 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,609 psi | 90% | 2890 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,753 psi | 89% | 2894 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,680 psi | 87% | 2913 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,421 psi | 90% | 2874 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,246 psi | 90% | 2946 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 53,838 psi | 84% | 2907 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,476 psi | 85% | 2982 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,086 psi | 88% | 2881 fps | 98.2% |
| Bofors RP15 | <<locked>> | 92% | 54,882 psi | 86% | 2904 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 56,869 psi | 89% | 2963 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 55,680 psi | 87% | 2913 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,129 psi | 86% | 2913 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,824 psi | 86% | 2854 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,493 psi | 90% | 2894 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,215 psi | 85% | 2762 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,144 psi | 88% | 3031 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,579 psi | 59% | 1791 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,231 psi | 88% | 2825 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,884 psi | 89% | 2828 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,608 psi | 87% | 2835 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 92% | 57,421 psi | 90% | 2959 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,384 psi | 74% | 2831 fps | 99.2% |
| Lovex S065 | <<locked>> | 82% | 56,637 psi | 89% | 2802 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,085 psi | 86% | 2805 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,305 psi | 90% | 2841 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,508 psi | 90% | 2887 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 48,008 psi | 75% | 2854 fps | 100% |
| Norma MRP | <<locked>> | 88% | 55,796 psi | 87% | 2933 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,868 psi | 86% | 2818 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,563 psi | 86% | 2923 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 84% | 57,334 psi | 90% | 2881 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,884 psi | 89% | 2910 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,508 psi | 60% | 1831 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,507 psi | 89% | 2858 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,969 psi | 86% | 2887 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,666 psi | 89% | 3025 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,898 psi | 88% | 2989 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 86% | 54,534 psi | 85% | 2822 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 56,492 psi | 89% | 2884 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,637 psi | 89% | 2802 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,085 psi | 86% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,608 psi | 87% | 2759 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,086 psi | 88% | 2884 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 55,840 psi | 88% | 2815 fps | 99.4% |
| Somchem S365 | <<locked>> | 84% | 55,811 psi | 87% | 2818 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,985 psi | 89% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,202 psi | 88% | 2805 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,652 psi | 89% | 2841 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 55,303 psi | 87% | 2858 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 82% | 55,506 psi | 87% | 2815 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,738 psi | 87% | 2851 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,405 psi | 87% | 2936 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 94% | 55,782 psi | 87% | 2923 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 98% | 56,884 psi | 89% | 2992 fps | 99.3% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,696 psi | 90% | 3048 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,593 psi | 87% | 2759 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,623 psi | 89% | 2966 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,652 psi | 89% | 2851 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% | 39,943 psi | 63% | 2556 fps | 99.7% |
| Accurate 4350 | <<locked>> | 80% | 52,852 psi | 83% | 2782 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,176 psi | 65% | 2674 fps | 96.5% |
| ADI AR 2209 | <<locked>> | 80% | 43,961 psi | 69% | 2680 fps | 99% |
| ADI AR 2213 | <<locked>> | 80% | 39,334 psi | 62% | 2621 fps | 97% |
| ADI AR 2217 | <<locked>> | 84% | 33,518 psi | 53% | 2480 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 98% | 46,354 psi | 73% | 2854 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 82% | 28,572 psi | 45% | 2388 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,324 psi | 69% | 2680 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,531 psi | 79% | 2785 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,918 psi | 69% | 2674 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,914 psi | 63% | 2628 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,711 psi | 61% | 2575 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,388 psi | 52% | 2510 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,163 psi | 68% | 2733 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 43,555 psi | 68% | 2779 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,859 psi | 69% | 2654 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 37,057 psi | 58% | 2566 fps | 97.5% |
| Bofors RP30 | <<locked>> | 82% | 32,996 psi | 52% | 2493 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 39,914 psi | 63% | 2628 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 80% | 31,792 psi | 50% | 2434 fps | 95% |
| Hodgdon H4831 | <<locked>> | 80% | 41,930 psi | 66% | 2621 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,191 psi | 65% | 2608 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,587 psi | 75% | 2664 fps | 100% |
| Hodgdon Retumbo | 61.5 gr | 80% | 32,532 psi | 51% | 2539 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 44% | 1598 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,719 psi | 78% | 2723 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,937 psi | 78% | 2726 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,250 psi | 68% | 2618 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 80% | 38,058 psi | 60% | 2602 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 90% | 33,823 psi | 53% | 2539 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 53,272 psi | 83% | 2753 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,590 psi | 81% | 2749 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,534 psi | 54% | 2438 fps | 98.9% |
| Norma 204 | <<locked>> | 80% | 50,212 psi | 79% | 2772 fps | 99.7% |
| Norma 217 | <<locked>> | 86% | 29,675 psi | 47% | 2448 fps | 96% |
| Norma MRP | <<locked>> | 80% | 42,148 psi | 66% | 2700 fps | 99.6% |
| Norma URP | <<locked>> | 80% | 51,242 psi | 80% | 2766 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,710 psi | 59% | 2608 fps | 97% |
| Ramshot Hunter | <<locked>> | 80% | 50,212 psi | 79% | 2772 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,794 psi | 53% | 2490 fps | 97.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,848 psi | 45% | 1637 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,823 psi | 83% | 2805 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,242 psi | 80% | 2831 fps | 100% |
| ReloadSwiss RS 76 | 65.9 gr | 80% | 31,647 psi | 50% | 2513 fps | 97.6% |
| ReloadSwiss RS 80 | 73 gr | 88% | 38,319 psi | 60% | 2657 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 44,933 psi | 70% | 2654 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 80% | 43,366 psi | 68% | 2661 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,272 psi | 83% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,590 psi | 81% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,011 psi | 82% | 2703 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,033 psi | 67% | 2657 fps | 99% |
| Somchem S361 | <<locked>> | 80% | 45,759 psi | 72% | 2644 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 48,965 psi | 77% | 2723 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,947 psi | 69% | 2641 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 52,779 psi | 83% | 2756 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,232 psi | 60% | 2520 fps | 98.4% |
| Vihtavuori N170 | <<locked>> | 94% | 51,967 psi | 81% | 2802 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 51,953 psi | 81% | 2762 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,062 psi | 67% | 2648 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,018 psi | 66% | 2690 fps | 97.3% |
| Vihtavuori N565 | <<locked>> | 80% | 34,737 psi | 54% | 2513 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 88% | 39,740 psi | 62% | 2677 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 94% | 46,731 psi | 73% | 2858 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,040 psi | 82% | 2710 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,853 psi | 56% | 2625 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,277 psi | 63% | 2572 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 .284 | 174gr | Prvi Partizan SP. Vihtavuori N570 delivers the highest muzzle velocity at 3,048 fps; across all powders the maximum-charge window runs from 1,791 fps to 3,048 fps. ADI AR 2217 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 174.0 gr projectile in 0.284" calls for a 1:11.5 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 | 174gr | 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.