Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 150gr | Prvi Partizan HP BT bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Alliant Reloder-26 and Hodgdon Retumbo.
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>> | 94% | 56,782 psi | 89% | 3031 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,244 psi | 85% | 3009 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 55,593 psi | 87% | 3136 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 90% | 55,143 psi | 86% | 3071 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 94% | 56,594 psi | 89% | 3133 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,821 psi | 80% | 3025 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,527 psi | 71% | 2989 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,129 psi | 86% | 3068 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,376 psi | 88% | 3081 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,781 psi | 86% | 3061 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,681 psi | 89% | 3130 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 54,476 psi | 85% | 3045 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,638 psi | 90% | 3163 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 54,766 psi | 86% | 3133 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 54,723 psi | 86% | 3031 fps | 96.4% |
| Bofors RP15 | <<locked>> | 96% | 55,854 psi | 88% | 3114 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,534 psi | 84% | 3107 fps | 99.1% |
| Bofors RP5 | <<locked>> | 94% | 56,681 psi | 89% | 3130 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 56,376 psi | 88% | 3009 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,130 psi | 88% | 3120 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 55,869 psi | 88% | 3064 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 54,882 psi | 86% | 3022 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 56,449 psi | 88% | 3068 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,463 psi | 87% | 3051 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,535 psi | 87% | 2986 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,391 psi | 88% | 3245 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 56,550 psi | 89% | 3104 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,159 psi | 58% | 1916 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,636 psi | 86% | 2995 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 54,346 psi | 85% | 2976 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 54,592 psi | 86% | 2999 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,348 psi | 90% | 3048 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 94% | 54,679 psi | 86% | 3114 fps | 98.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 41,060 psi | 64% | 2884 fps | 96.4% |
| Lovex S065 | <<locked>> | 84% | 55,085 psi | 86% | 2976 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,942 psi | 89% | 3031 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 54,360 psi | 85% | 2995 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,506 psi | 87% | 3051 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 41,191 psi | 65% | 2913 fps | 98.5% |
| Norma MRP | <<locked>> | 92% | 56,782 psi | 89% | 3156 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,463 psi | 88% | 3048 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,390 psi | 87% | 3133 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 55,143 psi | 86% | 3051 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 53,708 psi | 84% | 3064 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,000 psi | 60% | 1962 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,288 psi | 85% | 3031 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,550 psi | 89% | 3120 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 57,551 psi | 90% | 3241 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 52,156 psi | 82% | 3120 fps | 97.9% |
| Rottweil R 904 | <<locked>> | 90% | 56,304 psi | 88% | 3038 fps | 99% |
| Rottweil R 905 | <<locked>> | 90% | 54,128 psi | 85% | 3045 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 84% | 56,376 psi | 88% | 3009 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,085 psi | 86% | 2976 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,942 psi | 89% | 3031 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,334 psi | 90% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,331 psi | 85% | 2930 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,566 psi | 90% | 3104 fps | 99.8% |
| Somchem S355 | <<locked>> | 82% | 57,464 psi | 90% | 2999 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 54,070 psi | 85% | 2969 fps | 98.2% |
| Somchem S365 | <<locked>> | 88% | 56,869 psi | 89% | 3048 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,694 psi | 86% | 3018 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 55,158 psi | 86% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,433 psi | 85% | 2982 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 54,215 psi | 85% | 2995 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 86% | 57,276 psi | 90% | 3045 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,565 psi | 89% | 3071 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,463 psi | 88% | 3150 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 98% | 56,507 psi | 89% | 3127 fps | 99% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 53,330 psi | 84% | 3123 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,653 psi | 90% | 2989 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,130 psi | 88% | 3068 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 56,333 psi | 88% | 3186 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,520 psi | 85% | 3012 fps | 99.5% |
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% | 35,418 psi | 56% | 2631 fps | 97.9% |
| Accurate 4350 | <<locked>> | 80% | 47,326 psi | 74% | 2894 fps | 100% |
| Accurate MAGPRO | 70.6 gr | 86% | 44,991 psi | 71% | 2936 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 39,421 psi | 62% | 2762 fps | 96.5% |
| ADI AR 2213 | <<locked>> | 84% | 40,263 psi | 63% | 2812 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 92% | 38,885 psi | 61% | 2772 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 90% | 32,808 psi | 51% | 2671 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,237 psi | 71% | 2897 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,562 psi | 82% | 3022 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,436 psi | 62% | 2756 fps | 96.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,302 psi | 55% | 2694 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,040 psi | 53% | 2661 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,588 psi | 46% | 2562 fps | 96.4% |
| Alliant Reloder-26 | 66.4 gr | 80% | 37,463 psi | 59% | 2808 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 51,474 psi | 81% | 2972 fps | 95.6% |
| Bofors RP15 | <<locked>> | 82% | 35,201 psi | 55% | 2690 fps | 95% |
| Bofors RP30 | <<locked>> | 90% | 38,000 psi | 60% | 2792 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 35,302 psi | 55% | 2694 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 49,792 psi | 78% | 2897 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 37,217 psi | 58% | 2736 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 49,066 psi | 77% | 2949 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 51,372 psi | 81% | 2959 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 43,149 psi | 68% | 2822 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 42,235 psi | 66% | 2802 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,714 psi | 67% | 2776 fps | 100% |
| Hodgdon Retumbo | 66.7 gr | 86% | 35,201 psi | 55% | 2772 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 48,820 psi | 77% | 2976 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,847 psi | 44% | 1716 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,208 psi | 71% | 2825 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,111 psi | 80% | 2923 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 44,918 psi | 70% | 2835 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 41,814 psi | 66% | 2756 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 84% | 38,798 psi | 61% | 2789 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 98% | 38,450 psi | 60% | 2822 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 48,733 psi | 76% | 2871 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 47,108 psi | 74% | 2861 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 30,589 psi | 48% | 2503 fps | 96.1% |
| Norma 204 | <<locked>> | 80% | 45,455 psi | 71% | 2871 fps | 98% |
| Norma 217 | <<locked>> | 94% | 33,605 psi | 53% | 2720 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 36,985 psi | 58% | 2766 fps | 97.3% |
| Norma URP | <<locked>> | 80% | 46,412 psi | 73% | 2881 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 38,508 psi | 60% | 2795 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 45,295 psi | 71% | 2877 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 34,345 psi | 54% | 2667 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,485 psi | 45% | 1755 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,369 psi | 74% | 2917 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,571 psi | 71% | 2936 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 32,140 psi | 50% | 2680 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 41,582 psi | 65% | 2907 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 40,814 psi | 64% | 2743 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 38,885 psi | 61% | 2743 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 80% | 49,792 psi | 78% | 2897 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,733 psi | 76% | 2871 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 47,108 psi | 74% | 2861 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,056 psi | 85% | 2822 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,747 psi | 75% | 2815 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,551 psi | 60% | 2740 fps | 96.5% |
| Somchem S355 | <<locked>> | 80% | 53,998 psi | 85% | 2949 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 41,553 psi | 65% | 2730 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 43,468 psi | 68% | 2835 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,378 psi | 62% | 2726 fps | 97.5% |
| Vihtavuori N150 | <<locked>> | 80% | 51,808 psi | 81% | 2867 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,718 psi | 75% | 2874 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,084 psi | 53% | 2592 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 47,210 psi | 74% | 2877 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,159 psi | 60% | 2740 fps | 99.8% |
| Vihtavuori N560 | <<locked>> | 84% | 42,670 psi | 67% | 2884 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 88% | 40,205 psi | 63% | 2815 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 96% | 46,079 psi | 72% | 2986 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,862 psi | 73% | 2828 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,066 psi | 77% | 2949 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 30,371 psi | 48% | 2684 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,071 psi | 57% | 2648 fps | 95.5% |
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 78 powders for 7 x 66 SE v. Hofe loaded with the .284 | 150gr | Prvi Partizan HP BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,245 fps; across all powders the maximum-charge window runs from 1,916 fps to 3,245 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 150.0 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. Accurate MAGPRO, Alliant Reloder-26, Hodgdon Retumbo rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 150gr | Prvi Partizan HP BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-33, IMR 7977 Enduron burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.