Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 160gr | Barnes X S bullet and 70 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>> | 90% | 55,434 psi | 87% | 2904 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,231 psi | 88% | 2927 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 56,028 psi | 88% | 3051 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 90% | 56,782 psi | 89% | 3054 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 88% | 55,840 psi | 88% | 2976 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 57,348 psi | 90% | 3045 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 3012 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,314 psi | 79% | 2982 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,072 psi | 88% | 2972 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,637 psi | 87% | 2969 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 90% | 54,447 psi | 85% | 2989 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,072 psi | 88% | 2956 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 55,274 psi | 87% | 3025 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 56,347 psi | 88% | 3051 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 52,779 psi | 83% | 3041 fps | 96.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 54,824 psi | 86% | 2940 fps | 97% |
| Bofors RP15 | <<locked>> | 94% | 57,145 psi | 90% | 3031 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 55,361 psi | 87% | 3035 fps | 99.6% |
| Bofors RP5 | <<locked>> | 90% | 54,447 psi | 85% | 2989 fps | 99.8% |
| Bofors RP7 | <<locked>> | 82% | 57,130 psi | 90% | 2913 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 57,101 psi | 89% | 3035 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 56,869 psi | 89% | 2972 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 57,072 psi | 89% | 2979 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,086 psi | 88% | 2963 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,724 psi | 89% | 2894 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 54,259 psi | 85% | 3104 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 57,246 psi | 90% | 3012 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,594 psi | 59% | 1850 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,259 psi | 87% | 2900 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 55,941 psi | 88% | 2910 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 54,505 psi | 85% | 2904 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 92% | 55,680 psi | 87% | 3028 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,296 psi | 73% | 2900 fps | 98.3% |
| Lovex S065 | <<locked>> | 82% | 56,057 psi | 88% | 2884 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 54,607 psi | 86% | 2887 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,811 psi | 89% | 2923 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,202 psi | 88% | 2959 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 46,586 psi | 73% | 2927 fps | 99.7% |
| Norma MRP | <<locked>> | 88% | 54,259 psi | 85% | 3009 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,435 psi | 90% | 2953 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,550 psi | 89% | 3048 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 56,101 psi | 88% | 2959 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 55,100 psi | 86% | 2982 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,580 psi | 60% | 1896 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 55,767 psi | 87% | 2946 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 57,377 psi | 90% | 3025 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 54,824 psi | 86% | 3097 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 54,041 psi | 85% | 3051 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 88% | 56,797 psi | 89% | 2943 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 88% | 55,506 psi | 87% | 2963 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 57,130 psi | 90% | 2913 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,057 psi | 88% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,607 psi | 86% | 2887 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,114 psi | 86% | 2838 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,085 psi | 86% | 2959 fps | 99.8% |
| Somchem S361 | <<locked>> | 86% | 54,926 psi | 86% | 2884 fps | 98.7% |
| Somchem S365 | <<locked>> | 84% | 54,824 psi | 86% | 2907 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,115 psi | 88% | 2936 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 55,535 psi | 87% | 2890 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,550 psi | 87% | 2913 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 54,824 psi | 86% | 2897 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,201 psi | 87% | 2940 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,508 psi | 90% | 3061 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 94% | 54,708 psi | 86% | 2995 fps | 99.1% |
| Vihtavuori N568 | <<locked>> | 98% | 55,013 psi | 86% | 3054 fps | 98.3% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 55,796 psi | 87% | 3110 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 54,375 psi | 85% | 2838 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 56,869 psi | 89% | 2972 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 54,317 psi | 85% | 3048 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,506 psi | 87% | 2927 fps | 99.7% |
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% | 40,654 psi | 64% | 2648 fps | 99.4% |
| Accurate 4350 | <<locked>> | 80% | 52,808 psi | 83% | 2874 fps | 100% |
| Accurate High Country | 62.8 gr | 80% | 43,265 psi | 68% | 2812 fps | 97.3% |
| Accurate MAGPRO | <<locked>> | 80% | 40,770 psi | 64% | 2746 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 43,308 psi | 68% | 2753 fps | 98.2% |
| ADI AR 2213 | <<locked>> | 80% | 39,044 psi | 61% | 2687 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 88% | 38,014 psi | 60% | 2664 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 84% | 30,980 psi | 49% | 2526 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,545 psi | 78% | 2867 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,584 psi | 68% | 2749 fps | 98.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,668 psi | 62% | 2707 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,435 psi | 60% | 2657 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,562 psi | 53% | 2589 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,685 psi | 67% | 2818 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 49,037 psi | 77% | 2969 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 48,863 psi | 77% | 2828 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 37,144 psi | 58% | 2644 fps | 96.5% |
| Bofors RP30 | <<locked>> | 84% | 35,549 psi | 56% | 2638 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 39,668 psi | 62% | 2707 fps | 97.4% |
| Bofors RP7 | <<locked>> | 80% | 53,766 psi | 84% | 2861 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 36,448 psi | 57% | 2625 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 53,301 psi | 84% | 2917 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,495 psi | 65% | 2690 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,828 psi | 64% | 2674 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,181 psi | 74% | 2749 fps | 100% |
| Hodgdon Retumbo | 60.5 gr | 80% | 32,895 psi | 52% | 2615 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 53,345 psi | 84% | 2949 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,413 psi | 45% | 1657 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,965 psi | 77% | 2795 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 49,705 psi | 78% | 2815 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,844 psi | 67% | 2684 fps | 96.5% |
| IMR 7828 SSC | <<locked>> | 80% | 37,840 psi | 59% | 2671 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 92% | 36,143 psi | 57% | 2674 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 52,823 psi | 83% | 2835 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,430 psi | 81% | 2835 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,462 psi | 56% | 2530 fps | 98.4% |
| Norma 204 | <<locked>> | 80% | 49,400 psi | 77% | 2844 fps | 99.1% |
| Norma 217 | <<locked>> | 86% | 30,327 psi | 48% | 2533 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 41,742 psi | 65% | 2776 fps | 99% |
| Norma URP | <<locked>> | 80% | 50,792 psi | 80% | 2851 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,492 psi | 59% | 2677 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 49,472 psi | 78% | 2854 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,040 psi | 53% | 2569 fps | 96.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,167 psi | 46% | 1699 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,199 psi | 82% | 2890 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,082 psi | 78% | 2910 fps | 100% |
| ReloadSwiss RS 76 | 64.7 gr | 80% | 32,010 psi | 50% | 2589 fps | 96.5% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 40,857 psi | 64% | 2799 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 44,585 psi | 70% | 2726 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 80% | 43,192 psi | 68% | 2740 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 80% | 53,766 psi | 84% | 2861 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,823 psi | 83% | 2835 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,430 psi | 81% | 2835 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,851 psi | 81% | 2785 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,844 psi | 67% | 2736 fps | 98.2% |
| Somchem S361 | <<locked>> | 80% | 45,513 psi | 71% | 2717 fps | 97% |
| Somchem S365 | <<locked>> | 80% | 48,283 psi | 76% | 2808 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,903 psi | 69% | 2723 fps | 99% |
| Vihtavuori N160 | <<locked>> | 80% | 52,199 psi | 82% | 2841 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,348 psi | 60% | 2598 fps | 97.5% |
| Vihtavuori N550 | <<locked>> | 80% | 51,648 psi | 81% | 2848 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,294 psi | 68% | 2740 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,568 psi | 65% | 2762 fps | 96.1% |
| Vihtavuori N565 | <<locked>> | 82% | 37,362 psi | 59% | 2651 fps | 95% |
| Vihtavuori N568 | <<locked>> | 90% | 42,163 psi | 66% | 2808 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 96% | 48,689 psi | 76% | 2979 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,995 psi | 80% | 2789 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,534 psi | 84% | 2920 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,215 psi | 55% | 2713 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,103 psi | 63% | 2644 fps | 97.4% |
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 76 powders for 7 x 66 SE v. Hofe loaded with the .284 | 160gr | Barnes X S. Vihtavuori N570 delivers the highest muzzle velocity at 3,110 fps; across all powders the maximum-charge window runs from 1,850 fps to 3,110 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 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 1:10.0 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, Accurate High Country rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 160gr | Barnes X S 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.