Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 160gr | Barnes MRX 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 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% | 54,752 psi | 86% | 2923 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,840 psi | 88% | 2949 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 56,695 psi | 89% | 3084 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 92% | 57,653 psi | 90% | 3091 fps | 99% |
| ADI AR 2209 | <<locked>> | 90% | 57,072 psi | 89% | 3022 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 54,926 psi | 86% | 3028 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,895 psi | 83% | 2992 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,413 psi | 74% | 2953 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,145 psi | 90% | 3009 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,579 psi | 89% | 3009 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,056 psi | 86% | 3022 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,463 psi | 88% | 2986 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,202 psi | 88% | 3058 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,058 psi | 89% | 3081 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,434 psi | 88% | 2992 fps | 97.5% |
| Bofors RP15 | <<locked>> | 94% | 54,244 psi | 85% | 3009 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,666 psi | 87% | 3061 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 55,056 psi | 86% | 3022 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 54,331 psi | 85% | 2897 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 54,433 psi | 85% | 3018 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 84% | 57,638 psi | 90% | 3012 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,536 psi | 89% | 2969 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 54,665 psi | 86% | 2966 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,319 psi | 90% | 3005 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,334 psi | 90% | 2927 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 54,969 psi | 86% | 3140 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,433 psi | 85% | 2992 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,159 psi | 58% | 1864 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,231 psi | 88% | 2943 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,811 psi | 87% | 2920 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 56,449 psi | 88% | 2946 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,535 psi | 87% | 2946 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 94% | 56,840 psi | 89% | 3068 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,801 psi | 67% | 2851 fps | 97.7% |
| Lovex S065 | <<locked>> | 84% | 56,449 psi | 88% | 2920 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 54,708 psi | 86% | 2917 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,260 psi | 88% | 2943 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,537 psi | 90% | 3005 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 43,076 psi | 68% | 2877 fps | 99.4% |
| Norma MRP | <<locked>> | 90% | 54,940 psi | 86% | 3041 fps | 100% |
| Norma URP | <<locked>> | 84% | 54,389 psi | 85% | 2933 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 53,621 psi | 84% | 3028 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 57,159 psi | 90% | 2999 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,260 psi | 88% | 3018 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,985 psi | 60% | 1906 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,275 psi | 88% | 2979 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,752 psi | 86% | 3009 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,854 psi | 88% | 3133 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,839 psi | 86% | 3084 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 88% | 54,447 psi | 85% | 2933 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 90% | 56,202 psi | 88% | 3002 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 54,331 psi | 85% | 2897 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,449 psi | 88% | 2920 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 54,708 psi | 86% | 2917 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,709 psi | 87% | 2874 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,782 psi | 87% | 2995 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 55,825 psi | 87% | 2927 fps | 99% |
| Somchem S365 | <<locked>> | 86% | 55,143 psi | 86% | 2936 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,318 psi | 88% | 2966 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 56,608 psi | 89% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,057 psi | 88% | 2927 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,217 psi | 88% | 2949 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 55,376 psi | 87% | 2933 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 54,766 psi | 86% | 2959 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 54,665 psi | 86% | 3038 fps | 99% |
| Vihtavuori N565 | <<locked>> | 96% | 54,824 psi | 86% | 3025 fps | 99.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,637 psi | 87% | 3087 fps | 98.6% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 52,591 psi | 82% | 3077 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,695 psi | 87% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,099 psi | 85% | 2956 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,114 psi | 86% | 3074 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,579 psi | 89% | 2969 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% | 36,201 psi | 57% | 2582 fps | 98.7% |
| Accurate 4350 | <<locked>> | 80% | 48,631 psi | 76% | 2838 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 39,668 psi | 62% | 2759 fps | 96.4% |
| Accurate MAGPRO | <<locked>> | 82% | 40,292 psi | 63% | 2762 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 40,640 psi | 64% | 2720 fps | 97.6% |
| ADI AR 2213 | <<locked>> | 82% | 38,856 psi | 61% | 2713 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 90% | 37,463 psi | 59% | 2677 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 86% | 29,588 psi | 46% | 2513 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,847 psi | 73% | 2848 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,582 psi | 64% | 2713 fps | 97.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,405 psi | 57% | 2654 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,128 psi | 55% | 2612 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,342 psi | 48% | 2526 fps | 97.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,928 psi | 61% | 2762 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 46,543 psi | 73% | 2812 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 33,910 psi | 53% | 2592 fps | 95.3% |
| Bofors RP30 | <<locked>> | 88% | 36,622 psi | 57% | 2690 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 36,405 psi | 57% | 2654 fps | 96.5% |
| Bofors RP7 | <<locked>> | 80% | 51,024 psi | 80% | 2844 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 35,694 psi | 56% | 2635 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 50,560 psi | 79% | 2897 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 52,895 psi | 83% | 2910 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 38,638 psi | 61% | 2654 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 82% | 40,741 psi | 64% | 2700 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,034 psi | 69% | 2723 fps | 100% |
| Hodgdon Retumbo | 65.5 gr | 84% | 33,953 psi | 53% | 2677 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 50,546 psi | 79% | 2927 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,847 psi | 44% | 1667 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,456 psi | 73% | 2779 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,475 psi | 82% | 2871 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 46,166 psi | 72% | 2782 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,306 psi | 63% | 2657 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 82% | 37,420 psi | 59% | 2690 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 96% | 37,159 psi | 58% | 2723 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 49,908 psi | 78% | 2815 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,298 psi | 76% | 2808 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 31,154 psi | 49% | 2454 fps | 97.1% |
| Norma 204 | <<locked>> | 80% | 46,833 psi | 73% | 2825 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 30,269 psi | 47% | 2559 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 38,261 psi | 60% | 2723 fps | 98.3% |
| Norma URP | <<locked>> | 80% | 47,790 psi | 75% | 2828 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 36,999 psi | 58% | 2694 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 46,702 psi | 73% | 2831 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 30,574 psi | 48% | 2503 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,485 psi | 45% | 1706 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,863 psi | 77% | 2861 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,268 psi | 74% | 2887 fps | 100% |
| ReloadSwiss RS 76 | 68.4 gr | 82% | 30,647 psi | 48% | 2575 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 40,147 psi | 63% | 2802 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 41,959 psi | 66% | 2700 fps | 97% |
| Rottweil R 905 | <<locked>> | 80% | 40,045 psi | 63% | 2700 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 80% | 51,024 psi | 80% | 2844 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,908 psi | 78% | 2815 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,298 psi | 76% | 2808 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,834 psi | 77% | 2766 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,726 psi | 62% | 2697 fps | 97.6% |
| Somchem S361 | <<locked>> | 80% | 42,612 psi | 67% | 2687 fps | 96.4% |
| Somchem S365 | <<locked>> | 80% | 44,918 psi | 70% | 2779 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,422 psi | 63% | 2680 fps | 98.4% |
| Vihtavuori N150 | <<locked>> | 80% | 53,127 psi | 83% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,110 psi | 77% | 2818 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,027 psi | 55% | 2549 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 80% | 48,472 psi | 76% | 2825 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,218 psi | 61% | 2687 fps | 100% |
| Vihtavuori N560 | 64.7 gr | 80% | 38,334 psi | 60% | 2713 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 86% | 38,667 psi | 61% | 2710 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 92% | 41,539 psi | 65% | 2818 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 98% | 48,907 psi | 77% | 3009 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,530 psi | 76% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,560 psi | 79% | 2897 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 31,618 psi | 50% | 2644 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,101 psi | 58% | 2608 fps | 96.7% |
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 79 powders for 7 x 66 SE v. Hofe loaded with the .284 | 160gr | Barnes MRX BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,140 fps; across all powders the maximum-charge window runs from 1,864 fps to 3,140 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 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 160.0 gr projectile in 0.284" calls for a 1:12.0 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, Vihtavuori N560 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 160gr | Barnes MRX BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, 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.