Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 174gr | Prvi Partizan PSP BT bullet and 72 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% | 55,230 psi | 87% | 2808 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,941 psi | 88% | 2828 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 56,666 psi | 89% | 2966 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 53,693 psi | 84% | 2907 fps | 99% |
| ADI AR 2209 | <<locked>> | 88% | 56,739 psi | 89% | 2894 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 54,694 psi | 86% | 2907 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,594 psi | 89% | 2936 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 49,168 psi | 77% | 2910 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,923 psi | 80% | 2900 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 56,782 psi | 89% | 2890 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,101 psi | 89% | 2881 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,130 psi | 88% | 2884 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,085 psi | 86% | 2904 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,768 psi | 89% | 2864 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,362 psi | 88% | 2933 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,174 psi | 90% | 2956 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,780 psi | 84% | 2969 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,695 psi | 87% | 2871 fps | 98.1% |
| Bofors RP15 | <<locked>> | 92% | 54,302 psi | 85% | 2890 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 56,043 psi | 88% | 2949 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 55,085 psi | 86% | 2904 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 57,450 psi | 90% | 2825 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,360 psi | 85% | 2900 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 57,261 psi | 90% | 2881 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,259 psi | 85% | 2841 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,927 psi | 89% | 2884 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,145 psi | 90% | 2799 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,274 psi | 87% | 3018 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,478 psi | 59% | 1785 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,869 psi | 88% | 2818 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,231 psi | 88% | 2818 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,100 psi | 86% | 2825 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 92% | 56,782 psi | 89% | 2949 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,601 psi | 73% | 2815 fps | 99.1% |
| Lovex S065 | <<locked>> | 82% | 56,231 psi | 88% | 2792 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 54,447 psi | 85% | 2792 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,666 psi | 89% | 2828 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,927 psi | 89% | 2877 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 47,210 psi | 74% | 2841 fps | 100% |
| Norma MRP | <<locked>> | 88% | 54,911 psi | 86% | 2920 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,186 psi | 85% | 2808 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 53,650 psi | 84% | 2907 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 56,739 psi | 89% | 2871 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,014 psi | 88% | 2900 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,421 psi | 60% | 1827 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,086 psi | 88% | 2851 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,534 psi | 85% | 2881 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,854 psi | 88% | 3012 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,143 psi | 86% | 2976 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 88% | 57,508 psi | 90% | 2864 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 88% | 55,854 psi | 88% | 2874 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 57,450 psi | 90% | 2825 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,231 psi | 88% | 2792 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,447 psi | 85% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 54,984 psi | 86% | 2746 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,448 psi | 87% | 2871 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 55,303 psi | 87% | 2802 fps | 99.3% |
| Somchem S365 | <<locked>> | 84% | 55,332 psi | 87% | 2812 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,391 psi | 88% | 2848 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 55,767 psi | 87% | 2799 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,115 psi | 88% | 2831 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 54,882 psi | 86% | 2848 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 82% | 55,100 psi | 86% | 2808 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,085 psi | 86% | 2841 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,563 psi | 86% | 2920 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 94% | 54,984 psi | 86% | 2910 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 98% | 56,115 psi | 88% | 2979 fps | 99.2% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 56,913 psi | 89% | 3035 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,013 psi | 86% | 2749 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,493 psi | 90% | 2884 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 55,608 psi | 87% | 2949 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,057 psi | 88% | 2844 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% | 39,537 psi | 62% | 2546 fps | 99.7% |
| Accurate 4350 | <<locked>> | 80% | 52,344 psi | 82% | 2772 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 42,989 psi | 67% | 2720 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 80% | 40,611 psi | 64% | 2661 fps | 96.2% |
| ADI AR 2209 | <<locked>> | 80% | 43,569 psi | 68% | 2671 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 80% | 38,783 psi | 61% | 2605 fps | 96.8% |
| ADI AR 2217 | <<locked>> | 86% | 35,331 psi | 55% | 2526 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 98% | 45,774 psi | 72% | 2838 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 82% | 28,166 psi | 44% | 2375 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,903 psi | 69% | 2671 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,038 psi | 78% | 2776 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,497 psi | 68% | 2664 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,363 psi | 62% | 2615 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,232 psi | 60% | 2566 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,025 psi | 52% | 2500 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,511 psi | 67% | 2720 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 46,282 psi | 73% | 2831 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,468 psi | 68% | 2644 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 36,680 psi | 57% | 2552 fps | 97.3% |
| Bofors RP30 | <<locked>> | 82% | 32,590 psi | 51% | 2484 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 39,363 psi | 62% | 2615 fps | 98.2% |
| Bofors RP7 | <<locked>> | 80% | 53,969 psi | 85% | 2772 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 33,649 psi | 53% | 2484 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 53,737 psi | 84% | 2828 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,365 psi | 65% | 2608 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,640 psi | 64% | 2592 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,123 psi | 74% | 2657 fps | 100% |
| Hodgdon Retumbo | 60.9 gr | 80% | 32,169 psi | 50% | 2526 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 44% | 1594 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,284 psi | 77% | 2713 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,458 psi | 78% | 2717 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,902 psi | 67% | 2608 fps | 97.4% |
| IMR 7828 SSC | <<locked>> | 80% | 37,681 psi | 59% | 2592 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 90% | 33,373 psi | 52% | 2526 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 52,852 psi | 83% | 2743 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,140 psi | 80% | 2740 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,113 psi | 53% | 2428 fps | 98.8% |
| Norma 204 | <<locked>> | 80% | 49,821 psi | 78% | 2762 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 29,211 psi | 46% | 2431 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 41,553 psi | 65% | 2687 fps | 99.5% |
| Norma URP | <<locked>> | 80% | 50,807 psi | 80% | 2756 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,304 psi | 58% | 2595 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 80% | 49,777 psi | 78% | 2766 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,315 psi | 52% | 2477 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,848 psi | 45% | 1634 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,373 psi | 82% | 2799 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,560 psi | 79% | 2818 fps | 100% |
| ReloadSwiss RS 76 | 65.2 gr | 80% | 31,212 psi | 49% | 2500 fps | 97.3% |
| ReloadSwiss RS 80 | 72.3 gr | 88% | 37,855 psi | 59% | 2648 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 44,512 psi | 70% | 2644 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 80% | 42,931 psi | 67% | 2651 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 80% | 53,969 psi | 85% | 2772 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,852 psi | 83% | 2743 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,140 psi | 80% | 2740 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,605 psi | 81% | 2694 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,598 psi | 67% | 2648 fps | 98.9% |
| Somchem S361 | <<locked>> | 80% | 45,266 psi | 71% | 2635 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 48,443 psi | 76% | 2713 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,381 psi | 68% | 2628 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 52,315 psi | 82% | 2746 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,855 psi | 59% | 2510 fps | 98.2% |
| Vihtavuori N170 | <<locked>> | 94% | 51,285 psi | 80% | 2789 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 51,561 psi | 81% | 2753 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,612 psi | 67% | 2638 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,452 psi | 65% | 2677 fps | 97.1% |
| Vihtavuori N565 | <<locked>> | 82% | 36,724 psi | 58% | 2559 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 88% | 39,247 psi | 62% | 2664 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 94% | 46,006 psi | 72% | 2841 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,459 psi | 81% | 2700 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,737 psi | 84% | 2828 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,317 psi | 55% | 2615 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,914 psi | 63% | 2562 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 72 powders for 7 x 66 SE v. Hofe loaded with the .284 | 174gr | Prvi Partizan PSP BT. Vihtavuori N570 delivers the highest muzzle velocity at 3,035 fps; across all powders the maximum-charge window runs from 1,785 fps to 3,035 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 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 1:11.0 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 .284 | 174gr | Prvi Partizan PSP 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.