Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 160gr | Sierra SBT GameKing 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 Vihtavuori N560.
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% | 56,405 psi | 88% | 2940 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,334 psi | 90% | 2966 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 54,940 psi | 86% | 3041 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 88% | 54,360 psi | 85% | 2976 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 55,854 psi | 88% | 3041 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,940 psi | 85% | 3005 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,501 psi | 76% | 2969 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 54,650 psi | 86% | 2972 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 84% | 54,636 psi | 86% | 2969 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,493 psi | 90% | 3018 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,101 psi | 88% | 3035 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,580 psi | 90% | 2999 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,290 psi | 90% | 3068 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 54,360 psi | 85% | 3035 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 50,633 psi | 79% | 3018 fps | 96.2% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,217 psi | 90% | 3002 fps | 97.6% |
| Bofors RP15 | <<locked>> | 94% | 55,288 psi | 87% | 3022 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,087 psi | 89% | 3081 fps | 99.8% |
| Bofors RP5 | <<locked>> | 92% | 56,101 psi | 88% | 3035 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 55,434 psi | 87% | 2910 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 55,709 psi | 87% | 3035 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 55,056 psi | 86% | 2966 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,319 psi | 90% | 2976 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 55,579 psi | 87% | 2976 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 90% | 54,607 psi | 86% | 2959 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,897 psi | 86% | 2890 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,072 psi | 88% | 3153 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,419 psi | 87% | 3002 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,420 psi | 59% | 1864 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,276 psi | 90% | 2953 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,753 psi | 89% | 2933 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,537 psi | 90% | 2956 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,318 psi | 88% | 2956 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 92% | 54,085 psi | 85% | 3022 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,034 psi | 69% | 2874 fps | 98% |
| Lovex S065 | <<locked>> | 84% | 57,653 psi | 90% | 2930 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,956 psi | 88% | 2930 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,595 psi | 90% | 2959 fps | 100% |
| Norma 204 | <<locked>> | 84% | 54,636 psi | 86% | 2956 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 44,396 psi | 70% | 2900 fps | 99.6% |
| Norma MRP | <<locked>> | 90% | 56,318 psi | 88% | 3061 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,579 psi | 87% | 2946 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 54,708 psi | 86% | 3041 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 54,404 psi | 85% | 2956 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,464 psi | 90% | 3031 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,290 psi | 60% | 1909 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,392 psi | 90% | 2992 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,695 psi | 87% | 3018 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,087 psi | 89% | 3150 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,173 psi | 88% | 3104 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 88% | 55,303 psi | 87% | 2943 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 90% | 57,203 psi | 90% | 3012 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 55,434 psi | 87% | 2910 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,653 psi | 90% | 2930 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,956 psi | 88% | 2930 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,637 psi | 89% | 2884 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,768 psi | 89% | 3005 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 56,739 psi | 89% | 2933 fps | 99.1% |
| Somchem S365 | <<locked>> | 86% | 56,492 psi | 89% | 2949 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,667 psi | 90% | 2979 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,537 psi | 90% | 2864 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,246 psi | 90% | 2936 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,276 psi | 90% | 2959 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 56,376 psi | 88% | 2943 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,246 psi | 88% | 2976 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,985 psi | 88% | 3058 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 96% | 56,086 psi | 88% | 3038 fps | 99.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,898 psi | 89% | 3104 fps | 98.8% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 53,766 psi | 84% | 3094 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,579 psi | 89% | 2887 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,303 psi | 87% | 2972 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,478 psi | 89% | 3091 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,551 psi | 90% | 2979 fps | 99.9% |
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% | 37,681 psi | 59% | 2608 fps | 99% |
| Accurate 4350 | <<locked>> | 80% | 50,082 psi | 78% | 2858 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 41,379 psi | 65% | 2782 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 41,684 psi | 65% | 2740 fps | 97.9% |
| ADI AR 2213 | <<locked>> | 80% | 37,231 psi | 58% | 2667 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 88% | 36,013 psi | 56% | 2635 fps | 95% |
| ADI AR 2225 | <<locked>> | 86% | 30,618 psi | 48% | 2539 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,032 psi | 66% | 2740 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,935 psi | 75% | 2861 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,655 psi | 65% | 2733 fps | 97.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,594 psi | 59% | 2677 fps | 96.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,201 psi | 57% | 2631 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,444 psi | 49% | 2552 fps | 98.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,132 psi | 63% | 2785 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 47,007 psi | 74% | 2949 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 47,471 psi | 74% | 2825 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 34,911 psi | 55% | 2612 fps | 95.8% |
| Bofors RP30 | <<locked>> | 86% | 35,346 psi | 55% | 2654 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 37,594 psi | 59% | 2677 fps | 96.9% |
| Bofors RP7 | <<locked>> | 80% | 51,909 psi | 81% | 2854 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 34,360 psi | 54% | 2595 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 51,488 psi | 81% | 2907 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 53,896 psi | 84% | 2923 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 39,697 psi | 62% | 2674 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 39,015 psi | 61% | 2657 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,194 psi | 71% | 2736 fps | 100% |
| Hodgdon Retumbo | 63.8 gr | 82% | 32,764 psi | 51% | 2635 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 51,547 psi | 81% | 2940 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,094 psi | 44% | 1667 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,456 psi | 74% | 2792 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,185 psi | 83% | 2874 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,442 psi | 74% | 2799 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,278 psi | 65% | 2674 fps | 96.2% |
| IMR 7828 SSC | <<locked>> | 82% | 38,348 psi | 60% | 2707 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 94% | 35,911 psi | 56% | 2687 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 50,821 psi | 80% | 2825 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,284 psi | 77% | 2822 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,401 psi | 51% | 2480 fps | 97.6% |
| Norma 204 | <<locked>> | 80% | 47,703 psi | 75% | 2835 fps | 98.9% |
| Norma 217 | <<locked>> | 90% | 31,647 psi | 50% | 2595 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 39,494 psi | 62% | 2749 fps | 98.7% |
| Norma URP | <<locked>> | 80% | 48,747 psi | 76% | 2838 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 35,375 psi | 55% | 2648 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 47,645 psi | 75% | 2841 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 31,633 psi | 50% | 2526 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,761 psi | 45% | 1709 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,951 psi | 78% | 2877 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,196 psi | 76% | 2900 fps | 100% |
| ReloadSwiss RS 76 | 66.6 gr | 80% | 29,660 psi | 46% | 2536 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 41,423 psi | 65% | 2828 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 42,801 psi | 67% | 2713 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 80% | 41,046 psi | 64% | 2717 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 80% | 51,909 psi | 81% | 2854 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,821 psi | 80% | 2825 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,284 psi | 77% | 2822 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,763 psi | 78% | 2776 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,712 psi | 64% | 2713 fps | 97.8% |
| Somchem S361 | <<locked>> | 80% | 43,540 psi | 68% | 2703 fps | 96.6% |
| Somchem S365 | <<locked>> | 80% | 46,209 psi | 72% | 2795 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,669 psi | 65% | 2700 fps | 98.7% |
| Vihtavuori N150 | <<locked>> | 80% | 54,070 psi | 85% | 2815 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,241 psi | 79% | 2831 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,143 psi | 57% | 2572 fps | 97% |
| Vihtavuori N550 | <<locked>> | 80% | 49,472 psi | 78% | 2835 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,625 psi | 64% | 2710 fps | 100% |
| Vihtavuori N560 | 64.6 gr | 80% | 39,508 psi | 62% | 2736 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 84% | 37,217 psi | 58% | 2671 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 92% | 42,888 psi | 67% | 2844 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 98% | 50,096 psi | 79% | 3028 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,385 psi | 77% | 2785 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,692 psi | 81% | 2913 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,808 psi | 51% | 2671 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,087 psi | 60% | 2621 fps | 97% |
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 | Sierra SBT GameKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,153 fps; across all powders the maximum-charge window runs from 1,864 fps to 3,153 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 1:11.5 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, Vihtavuori N560 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 160gr | Sierra SBT GameKing 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.