Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 160gr | NorthFork Bonded Core 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 Winchester StaBALL HD.
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% | 54,534 psi | 85% | 2910 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,666 psi | 87% | 2936 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 55,941 psi | 88% | 3064 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 92% | 57,058 psi | 89% | 3071 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 90% | 56,304 psi | 88% | 2999 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 54,317 psi | 85% | 3009 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,141 psi | 82% | 2966 fps | 99.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,659 psi | 73% | 2930 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,550 psi | 89% | 2992 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,696 psi | 90% | 3002 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,898 psi | 88% | 2989 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 54,534 psi | 85% | 3005 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,883 psi | 88% | 2969 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,158 psi | 86% | 3035 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,318 psi | 88% | 3064 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,579 psi | 87% | 2963 fps | 97.1% |
| Bofors RP15 | <<locked>> | 96% | 57,101 psi | 89% | 3045 fps | 99.9% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,868 psi | 86% | 3038 fps | 99.6% |
| Bofors RP5 | <<locked>> | 92% | 54,534 psi | 85% | 3005 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 57,508 psi | 90% | 2933 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,711 psi | 90% | 3058 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 84% | 57,072 psi | 89% | 2992 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 55,840 psi | 88% | 2946 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 90% | 54,099 psi | 85% | 2943 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,753 psi | 89% | 2986 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,695 psi | 89% | 2910 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 54,056 psi | 85% | 3114 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 53,780 psi | 84% | 2969 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,188 psi | 58% | 1850 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,695 psi | 87% | 2923 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,317 psi | 87% | 2900 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 55,999 psi | 88% | 2930 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 54,926 psi | 86% | 2923 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 94% | 55,941 psi | 88% | 3045 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,264 psi | 66% | 2831 fps | 97.4% |
| Lovex S065 | <<locked>> | 84% | 56,202 psi | 88% | 2900 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 54,491 psi | 85% | 2900 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,753 psi | 87% | 2927 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,840 psi | 89% | 2982 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 42,540 psi | 67% | 2861 fps | 99.2% |
| Norma MRP | <<locked>> | 90% | 54,157 psi | 85% | 3018 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,638 psi | 90% | 2969 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,942 psi | 89% | 3071 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 86% | 56,478 psi | 89% | 2979 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,187 psi | 86% | 2995 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,058 psi | 60% | 1893 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,622 psi | 87% | 2959 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 53,940 psi | 85% | 2989 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,679 psi | 86% | 3107 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,809 psi | 84% | 3061 fps | 98.6% |
| Rottweil R 904 | <<locked>> | 90% | 57,319 psi | 90% | 2966 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 90% | 55,550 psi | 87% | 2979 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 57,508 psi | 90% | 2933 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,202 psi | 88% | 2900 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 54,491 psi | 85% | 2900 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,274 psi | 87% | 2854 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,129 psi | 86% | 2972 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 55,245 psi | 87% | 2900 fps | 98.7% |
| Somchem S365 | <<locked>> | 86% | 54,563 psi | 86% | 2920 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,912 psi | 88% | 2946 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 56,217 psi | 88% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,709 psi | 87% | 2910 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,550 psi | 87% | 2930 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 54,969 psi | 86% | 2917 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 54,505 psi | 85% | 2946 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 53,940 psi | 85% | 3015 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 96% | 54,172 psi | 85% | 3002 fps | 99% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,766 psi | 86% | 3064 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,056 psi | 86% | 2861 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,334 psi | 90% | 2995 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 53,940 psi | 85% | 3054 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,869 psi | 88% | 2946 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% | 36,463 psi | 57% | 2575 fps | 98.6% |
| Accurate 4350 | <<locked>> | 80% | 48,631 psi | 76% | 2825 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 39,523 psi | 62% | 2746 fps | 96.2% |
| Accurate MAGPRO | <<locked>> | 84% | 43,047 psi | 67% | 2812 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 40,277 psi | 63% | 2700 fps | 97.4% |
| ADI AR 2213 | <<locked>> | 82% | 38,508 psi | 60% | 2690 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 90% | 37,405 psi | 59% | 2664 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 86% | 29,559 psi | 46% | 2500 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,427 psi | 73% | 2831 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,722 psi | 84% | 2946 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,495 psi | 63% | 2700 fps | 97.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,245 psi | 57% | 2641 fps | 96.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,070 psi | 55% | 2605 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,327 psi | 48% | 2516 fps | 97.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,667 psi | 61% | 2753 fps | 99.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 49,255 psi | 77% | 2851 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 33,765 psi | 53% | 2579 fps | 95.1% |
| Bofors RP30 | <<locked>> | 88% | 36,506 psi | 57% | 2680 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 36,245 psi | 57% | 2641 fps | 96.3% |
| Bofors RP7 | <<locked>> | 80% | 50,865 psi | 80% | 2828 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 35,607 psi | 56% | 2621 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 49,980 psi | 78% | 2877 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 52,417 psi | 82% | 2890 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 82% | 41,278 psi | 65% | 2700 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 82% | 40,364 psi | 63% | 2684 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,816 psi | 69% | 2710 fps | 100% |
| Hodgdon Retumbo | 63.5 gr | 84% | 33,808 psi | 53% | 2661 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 49,922 psi | 78% | 2907 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,978 psi | 44% | 1657 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,093 psi | 72% | 2759 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,185 psi | 82% | 2851 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 46,108 psi | 72% | 2769 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,045 psi | 63% | 2641 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 82% | 37,115 psi | 58% | 2671 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 96% | 36,912 psi | 58% | 2707 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 49,777 psi | 78% | 2799 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,022 psi | 75% | 2792 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 31,401 psi | 49% | 2451 fps | 97.1% |
| Norma 204 | <<locked>> | 80% | 46,325 psi | 73% | 2802 fps | 98.6% |
| Norma 217 | <<locked>> | 90% | 30,429 psi | 48% | 2556 fps | 95% |
| Norma MRP | <<locked>> | 80% | 38,101 psi | 60% | 2713 fps | 98.2% |
| Norma URP | <<locked>> | 80% | 47,413 psi | 74% | 2812 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 36,767 psi | 58% | 2674 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 46,238 psi | 72% | 2812 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 82% | 32,851 psi | 51% | 2556 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,660 psi | 45% | 1696 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,617 psi | 76% | 2848 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,702 psi | 73% | 2867 fps | 100% |
| ReloadSwiss RS 76 | 66.4 gr | 82% | 30,763 psi | 48% | 2569 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 39,784 psi | 62% | 2785 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 41,640 psi | 65% | 2680 fps | 96.7% |
| Rottweil R 905 | <<locked>> | 80% | 39,813 psi | 62% | 2687 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 80% | 50,865 psi | 80% | 2828 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,777 psi | 78% | 2799 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,022 psi | 75% | 2792 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,617 psi | 76% | 2746 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,479 psi | 62% | 2680 fps | 97.3% |
| Somchem S361 | <<locked>> | 80% | 42,395 psi | 66% | 2671 fps | 96.1% |
| Somchem S365 | <<locked>> | 80% | 44,556 psi | 70% | 2762 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,335 psi | 63% | 2667 fps | 98.3% |
| Vihtavuori N150 | <<locked>> | 80% | 52,736 psi | 83% | 2789 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,921 psi | 77% | 2805 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,070 psi | 55% | 2539 fps | 96.5% |
| Vihtavuori N550 | <<locked>> | 80% | 48,254 psi | 76% | 2808 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,276 psi | 62% | 2680 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 41,031 psi | 64% | 2766 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 86% | 38,450 psi | 60% | 2697 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 94% | 44,251 psi | 69% | 2871 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,095 psi | 75% | 2762 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,212 psi | 79% | 2881 fps | 99.9% |
| Winchester StaBALL HD | 62.1 gr | 80% | 31,212 psi | 49% | 2635 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,854 psi | 58% | 2589 fps | 96.4% |
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 | 160gr | NorthFork Bonded Core. Hodgdon Retumbo delivers the highest muzzle velocity at 3,114 fps; across all powders the maximum-charge window runs from 1,850 fps to 3,114 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 160.0 gr projectile in 0.284" calls for a 1:10.0 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, Winchester StaBALL HD rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 160gr | NorthFork Bonded Core 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.