Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 145gr | Prvi Partizan SP bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Ramshot Grand and Accurate High Country.
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% | 56,913 psi | 89% | 3081 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,201 psi | 85% | 3058 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 54,491 psi | 85% | 3176 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 92% | 55,492 psi | 87% | 3182 fps | 98% |
| ADI AR 2209 | <<locked>> | 90% | 54,926 psi | 86% | 3117 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 94% | 56,637 psi | 89% | 3182 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,937 psi | 80% | 3074 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,382 psi | 71% | 3031 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 55,201 psi | 87% | 3114 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,100 psi | 86% | 3117 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,260 psi | 88% | 3130 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,549 psi | 85% | 3104 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,695 psi | 89% | 3179 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 54,375 psi | 85% | 3091 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,450 psi | 90% | 3209 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 54,723 psi | 86% | 3182 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 54,621 psi | 86% | 3074 fps | 96.1% |
| Bofors RP15 | <<locked>> | 96% | 55,622 psi | 87% | 3159 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,345 psi | 84% | 3146 fps | 99% |
| Bofors RP5 | <<locked>> | 94% | 56,695 psi | 89% | 3179 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 56,420 psi | 88% | 3058 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,188 psi | 88% | 3169 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 84% | 55,753 psi | 87% | 3114 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 54,679 psi | 86% | 3068 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 92% | 56,507 psi | 89% | 3117 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,303 psi | 87% | 3097 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,448 psi | 87% | 3035 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,173 psi | 88% | 3287 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 56,376 psi | 88% | 3153 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,159 psi | 58% | 1959 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,549 psi | 85% | 3045 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 54,201 psi | 85% | 3025 fps | 99.8% |
| IMR 4831 | <<locked>> | 86% | 54,520 psi | 85% | 3048 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,290 psi | 90% | 3097 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 94% | 54,491 psi | 85% | 3156 fps | 98.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 40,988 psi | 64% | 2923 fps | 96% |
| Lovex S065 | <<locked>> | 84% | 54,911 psi | 86% | 3022 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,637 psi | 89% | 3077 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 54,288 psi | 85% | 3041 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,550 psi | 87% | 3100 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 41,075 psi | 64% | 2953 fps | 98.3% |
| Norma MRP | <<locked>> | 92% | 56,724 psi | 89% | 3202 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,144 psi | 88% | 3094 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,317 psi | 87% | 3182 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 55,187 psi | 86% | 3100 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 53,708 psi | 84% | 3107 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,971 psi | 60% | 2001 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,317 psi | 85% | 3081 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,463 psi | 88% | 3169 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 57,305 psi | 90% | 3287 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 52,170 psi | 82% | 3163 fps | 97.7% |
| Rottweil R 904 | <<locked>> | 90% | 56,057 psi | 88% | 3084 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 90% | 54,143 psi | 85% | 3094 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 56,420 psi | 88% | 3058 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,911 psi | 86% | 3022 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,637 psi | 89% | 3077 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,319 psi | 90% | 2917 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,070 psi | 85% | 2972 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,493 psi | 90% | 3150 fps | 99.7% |
| Somchem S355 | <<locked>> | 82% | 57,319 psi | 90% | 3048 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 54,128 psi | 85% | 3015 fps | 98% |
| Somchem S365 | <<locked>> | 88% | 56,927 psi | 89% | 3097 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,650 psi | 86% | 3064 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 55,013 psi | 86% | 2966 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,375 psi | 85% | 3031 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 54,288 psi | 85% | 3045 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 57,087 psi | 89% | 3091 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,565 psi | 89% | 3120 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,478 psi | 89% | 3196 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 98% | 56,275 psi | 88% | 3173 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 53,258 psi | 83% | 3169 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,566 psi | 90% | 3038 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,999 psi | 88% | 3117 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 56,115 psi | 88% | 3232 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,563 psi | 86% | 3058 fps | 99.3% |
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% | 35,331 psi | 55% | 2667 fps | 97.6% |
| Accurate 4350 | <<locked>> | 80% | 47,195 psi | 74% | 2940 fps | 100% |
| Accurate High Country | 67.5 gr | 82% | 41,104 psi | 64% | 2907 fps | 95.7% |
| Accurate MAGPRO | 72.1 gr | 86% | 44,715 psi | 70% | 2976 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 39,363 psi | 62% | 2805 fps | 96.2% |
| ADI AR 2213 | <<locked>> | 84% | 40,205 psi | 63% | 2851 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 94% | 41,553 psi | 65% | 2881 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 90% | 32,750 psi | 51% | 2707 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,682 psi | 62% | 2805 fps | 96.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,194 psi | 71% | 2946 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,315 psi | 82% | 3071 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,320 psi | 62% | 2799 fps | 96.3% |
| Alliant Reloder-22 | <<locked>> | 82% | 37,724 psi | 59% | 2799 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,982 psi | 53% | 2700 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,544 psi | 46% | 2598 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,362 psi | 59% | 2848 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 51,445 psi | 81% | 3015 fps | 95.3% |
| Bofors RP15 | <<locked>> | 84% | 37,565 psi | 59% | 2792 fps | 95.6% |
| Bofors RP30 | <<locked>> | 90% | 37,797 psi | 59% | 2828 fps | 95% |
| Bofors RP5 | <<locked>> | 82% | 37,724 psi | 59% | 2799 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 49,748 psi | 78% | 2943 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 90% | 39,697 psi | 62% | 2838 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 48,878 psi | 77% | 2992 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 80% | 51,227 psi | 80% | 3009 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 84% | 42,873 psi | 67% | 2861 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 84% | 42,177 psi | 66% | 2844 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,685 psi | 67% | 2822 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 35,099 psi | 55% | 2812 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 48,631 psi | 76% | 3018 fps | 99.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,876 psi | 44% | 1752 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,121 psi | 71% | 2871 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,024 psi | 80% | 2969 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 44,846 psi | 70% | 2881 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 41,858 psi | 66% | 2802 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 86% | 41,495 psi | 65% | 2897 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 98% | 38,406 psi | 60% | 2861 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 48,689 psi | 76% | 2917 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 46,891 psi | 73% | 2904 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 30,443 psi | 48% | 2539 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 45,266 psi | 71% | 2913 fps | 97.7% |
| Norma 217 | <<locked>> | 94% | 33,663 psi | 53% | 2759 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 36,941 psi | 58% | 2808 fps | 97.1% |
| Norma URP | <<locked>> | 80% | 46,122 psi | 72% | 2923 fps | 100% |
| Ramshot Grand | 70.2 gr | 86% | 41,191 psi | 65% | 2904 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 45,121 psi | 71% | 2920 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 84% | 34,345 psi | 54% | 2707 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,485 psi | 45% | 1795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,326 psi | 74% | 2963 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,498 psi | 71% | 2982 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 31,966 psi | 50% | 2710 fps | 95% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 44,788 psi | 70% | 3018 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 40,582 psi | 64% | 2782 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 80% | 38,812 psi | 61% | 2785 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 80% | 49,748 psi | 78% | 2943 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,689 psi | 76% | 2917 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 46,891 psi | 73% | 2904 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,882 psi | 84% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,659 psi | 75% | 2861 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,479 psi | 60% | 2782 fps | 96.2% |
| Somchem S355 | <<locked>> | 80% | 53,969 psi | 85% | 2999 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 44,222 psi | 69% | 2831 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 43,352 psi | 68% | 2877 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,291 psi | 62% | 2766 fps | 97.3% |
| Vihtavuori N150 | <<locked>> | 80% | 51,517 psi | 81% | 2913 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,587 psi | 75% | 2917 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,011 psi | 53% | 2631 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 47,036 psi | 74% | 2920 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,087 psi | 60% | 2782 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 42,699 psi | 67% | 2930 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 90% | 42,989 psi | 67% | 2920 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 96% | 46,122 psi | 72% | 3031 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,760 psi | 73% | 2874 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,878 psi | 77% | 2992 fps | 99.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 30,226 psi | 47% | 2717 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,926 psi | 56% | 2684 fps | 95.1% |
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 75 powders for 7 x 66 SE v. Hofe loaded with the .284 | 145gr | Prvi Partizan SP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,287 fps; across all powders the maximum-charge window runs from 1,959 fps to 3,287 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 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 145.0 gr projectile in 0.284" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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, Ramshot Grand, Accurate High Country rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 145gr | 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.