Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 160gr | Speer Grand Slam bullet and 73 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 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>> | 92% | 57,101 psi | 89% | 2953 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 54,085 psi | 85% | 2920 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 54,795 psi | 86% | 3051 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 90% | 55,651 psi | 87% | 3054 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 88% | 55,085 psi | 86% | 2989 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 56,594 psi | 89% | 3054 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,766 psi | 86% | 3022 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,095 psi | 77% | 2979 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 55,158 psi | 86% | 2982 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,274 psi | 87% | 2979 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 54,534 psi | 85% | 2972 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,840 psi | 89% | 3048 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 54,810 psi | 86% | 2959 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 54,404 psi | 85% | 3025 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,158 psi | 86% | 3048 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 51,445 psi | 81% | 3035 fps | 96.5% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,682 psi | 90% | 3012 fps | 97.8% |
| Bofors RP15 | <<locked>> | 94% | 56,014 psi | 88% | 3035 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 53,969 psi | 85% | 3031 fps | 99.6% |
| Bofors RP5 | <<locked>> | 92% | 56,840 psi | 89% | 3048 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 55,738 psi | 87% | 2917 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 56,333 psi | 88% | 3045 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 55,622 psi | 87% | 2976 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 56,231 psi | 88% | 2986 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,317 psi | 87% | 2972 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,521 psi | 87% | 2897 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 57,101 psi | 89% | 3169 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 56,188 psi | 88% | 3015 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,478 psi | 59% | 1870 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 54,172 psi | 85% | 2907 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,276 psi | 90% | 2943 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 54,621 psi | 86% | 2913 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,014 psi | 89% | 2969 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 92% | 54,853 psi | 86% | 3035 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,686 psi | 70% | 2887 fps | 98.1% |
| Lovex S065 | <<locked>> | 82% | 54,578 psi | 86% | 2887 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,492 psi | 89% | 2940 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 54,752 psi | 86% | 2917 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,129 psi | 86% | 2966 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 45,121 psi | 71% | 2913 fps | 99.7% |
| Norma MRP | <<locked>> | 90% | 56,811 psi | 89% | 3068 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,159 psi | 88% | 2956 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,753 psi | 87% | 3058 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 54,911 psi | 86% | 2963 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 54,027 psi | 85% | 2986 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,348 psi | 60% | 1913 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 54,230 psi | 85% | 2943 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,521 psi | 89% | 3028 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 53,766 psi | 84% | 3097 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 57,116 psi | 90% | 3117 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 88% | 56,028 psi | 88% | 2956 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 88% | 54,215 psi | 85% | 2963 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 55,738 psi | 87% | 2917 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 54,578 psi | 86% | 2887 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,492 psi | 89% | 2940 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,130 psi | 90% | 2894 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,522 psi | 90% | 3018 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 57,348 psi | 90% | 2946 fps | 99.2% |
| Somchem S365 | <<locked>> | 86% | 57,087 psi | 89% | 2959 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 54,679 psi | 86% | 2936 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 54,085 psi | 85% | 2894 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 54,433 psi | 85% | 2920 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 98% | 56,840 psi | 89% | 2986 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 84% | 56,927 psi | 89% | 2953 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,855 psi | 89% | 2986 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,449 psi | 88% | 3068 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 96% | 56,782 psi | 89% | 3051 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 53,896 psi | 84% | 3054 fps | 98.3% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 54,694 psi | 86% | 3110 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,305 psi | 90% | 2900 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,840 psi | 88% | 2979 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 57,406 psi | 90% | 3100 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 54,404 psi | 85% | 2930 fps | 99.8% |
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% | 38,159 psi | 60% | 2618 fps | 99.1% |
| Accurate 4350 | <<locked>> | 80% | 50,705 psi | 79% | 2867 fps | 100% |
| Accurate High Country | 65.3 gr | 80% | 41,481 psi | 65% | 2795 fps | 97% |
| Accurate MAGPRO | <<locked>> | 82% | 42,047 psi | 66% | 2799 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 42,018 psi | 66% | 2746 fps | 98% |
| ADI AR 2213 | <<locked>> | 80% | 37,507 psi | 59% | 2674 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 88% | 36,550 psi | 57% | 2651 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 84% | 29,095 psi | 46% | 2490 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,540 psi | 67% | 2749 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,312 psi | 76% | 2867 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,148 psi | 66% | 2743 fps | 98.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,956 psi | 59% | 2687 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,724 psi | 58% | 2641 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,734 psi | 50% | 2562 fps | 98.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,901 psi | 64% | 2802 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 47,761 psi | 75% | 2966 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 47,964 psi | 75% | 2835 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 35,404 psi | 55% | 2621 fps | 96% |
| Bofors RP30 | <<locked>> | 86% | 35,984 psi | 56% | 2667 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 37,956 psi | 59% | 2687 fps | 97.1% |
| Bofors RP7 | <<locked>> | 80% | 52,446 psi | 82% | 2864 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 34,722 psi | 54% | 2608 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 52,054 psi | 82% | 2920 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 40,176 psi | 63% | 2684 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 39,320 psi | 62% | 2667 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,571 psi | 71% | 2746 fps | 100% |
| Hodgdon Retumbo | 64.5 gr | 82% | 33,185 psi | 52% | 2648 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 52,257 psi | 82% | 2953 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,065 psi | 44% | 1670 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,776 psi | 75% | 2799 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,722 psi | 84% | 2887 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 48,008 psi | 75% | 2808 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,553 psi | 65% | 2680 fps | 96.3% |
| IMR 7828 SSC | <<locked>> | 82% | 38,827 psi | 61% | 2720 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 94% | 36,492 psi | 57% | 2703 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 51,387 psi | 81% | 2835 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,835 psi | 78% | 2831 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,909 psi | 52% | 2493 fps | 97.8% |
| Norma 204 | <<locked>> | 80% | 48,211 psi | 76% | 2844 fps | 99% |
| Norma 217 | <<locked>> | 88% | 30,023 psi | 47% | 2546 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 40,045 psi | 63% | 2759 fps | 98.8% |
| Norma URP | <<locked>> | 80% | 49,356 psi | 77% | 2851 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 35,839 psi | 56% | 2657 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 48,167 psi | 75% | 2851 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 32,024 psi | 50% | 2539 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,747 psi | 45% | 1713 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,749 psi | 80% | 2890 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,762 psi | 76% | 2907 fps | 100% |
| ReloadSwiss RS 76 | 67.3 gr | 80% | 30,008 psi | 47% | 2549 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 39,146 psi | 61% | 2776 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 43,308 psi | 68% | 2726 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 80% | 41,568 psi | 65% | 2730 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 80% | 52,446 psi | 82% | 2864 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,387 psi | 81% | 2835 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,835 psi | 78% | 2831 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,285 psi | 79% | 2785 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,220 psi | 65% | 2726 fps | 98% |
| Somchem S361 | <<locked>> | 80% | 43,961 psi | 69% | 2710 fps | 96.8% |
| Somchem S365 | <<locked>> | 80% | 46,615 psi | 73% | 2802 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,989 psi | 66% | 2707 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 80% | 50,821 psi | 80% | 2841 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,622 psi | 57% | 2582 fps | 97.2% |
| Vihtavuori N170 | <<locked>> | 96% | 52,968 psi | 83% | 2923 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 50,009 psi | 78% | 2844 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,017 psi | 64% | 2720 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 40,016 psi | 63% | 2749 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 84% | 37,855 psi | 59% | 2684 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 92% | 43,526 psi | 68% | 2861 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 98% | 50,966 psi | 80% | 3045 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,893 psi | 78% | 2792 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,257 psi | 82% | 2923 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,446 psi | 52% | 2680 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,551 psi | 60% | 2635 fps | 97.2% |
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 73 powders for 7 x 66 SE v. Hofe loaded with the .284 | 160gr | Speer Grand Slam. Hodgdon Retumbo delivers the highest muzzle velocity at 3,169 fps; across all powders the maximum-charge window runs from 1,870 fps to 3,169 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 160.0 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-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, Accurate High Country rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 160gr | Speer Grand Slam 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.