Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 160gr | Winchester Silvertip bullet and 69 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>> | 90% | 55,172 psi | 86% | 2930 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,028 psi | 88% | 2953 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 56,898 psi | 89% | 3091 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 88% | 53,940 psi | 85% | 3031 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 88% | 56,681 psi | 89% | 3018 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 54,781 psi | 86% | 3028 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,753 psi | 89% | 3058 fps | 99.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,372 psi | 81% | 3022 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,956 psi | 89% | 3005 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,289 psi | 88% | 3009 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,172 psi | 86% | 3025 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,710 psi | 89% | 2989 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,666 psi | 89% | 3061 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,638 psi | 90% | 3084 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,186 psi | 85% | 3084 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,825 psi | 87% | 2989 fps | 97.7% |
| Bofors RP15 | <<locked>> | 92% | 54,578 psi | 86% | 3015 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 56,347 psi | 88% | 3071 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 55,172 psi | 86% | 3025 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 57,435 psi | 90% | 2953 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,476 psi | 85% | 3022 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 57,334 psi | 90% | 3009 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,462 psi | 85% | 2966 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,985 psi | 89% | 3005 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,290 psi | 90% | 2930 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,492 psi | 87% | 3146 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,492 psi | 59% | 1883 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,738 psi | 87% | 2940 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,362 psi | 88% | 2943 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,027 psi | 86% | 2943 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 92% | 56,927 psi | 89% | 3071 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,920 psi | 74% | 2930 fps | 98.7% |
| Lovex S065 | <<locked>> | 82% | 56,028 psi | 88% | 2913 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 54,592 psi | 86% | 2917 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,753 psi | 89% | 2953 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,942 psi | 89% | 2999 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 47,471 psi | 74% | 2956 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 55,172 psi | 86% | 3045 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,346 psi | 85% | 2936 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 53,940 psi | 85% | 3031 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 56,782 psi | 89% | 2995 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,449 psi | 88% | 3022 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,363 psi | 60% | 1926 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,217 psi | 88% | 2979 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,491 psi | 85% | 3005 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,318 psi | 88% | 3136 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,564 psi | 87% | 3097 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 88% | 57,522 psi | 90% | 2989 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 56,043 psi | 88% | 3002 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 57,435 psi | 90% | 2953 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,028 psi | 88% | 2913 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,592 psi | 86% | 2917 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,042 psi | 86% | 2867 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,622 psi | 87% | 2995 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 55,303 psi | 87% | 2923 fps | 99.1% |
| Somchem S365 | <<locked>> | 84% | 55,245 psi | 87% | 2936 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,434 psi | 88% | 2969 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 55,854 psi | 88% | 2923 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,275 psi | 88% | 2953 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 54,969 psi | 86% | 2927 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,187 psi | 86% | 2963 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,766 psi | 86% | 3045 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 94% | 55,172 psi | 86% | 3028 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 56,362 psi | 88% | 3097 fps | 98.8% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,232 psi | 90% | 3156 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,129 psi | 86% | 2874 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,551 psi | 90% | 3012 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,028 psi | 88% | 3081 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,260 psi | 88% | 2966 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% | 39,552 psi | 62% | 2654 fps | 99.4% |
| Accurate 4350 | <<locked>> | 80% | 52,388 psi | 82% | 2897 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 43,120 psi | 68% | 2835 fps | 97.6% |
| Accurate MAGPRO | <<locked>> | 80% | 40,582 psi | 64% | 2766 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 43,453 psi | 68% | 2782 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 38,928 psi | 61% | 2717 fps | 96.1% |
| ADI AR 2217 | <<locked>> | 86% | 35,462 psi | 56% | 2628 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 84% | 30,182 psi | 47% | 2530 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,053 psi | 78% | 2900 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,540 psi | 68% | 2779 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,465 psi | 62% | 2723 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,232 psi | 60% | 2674 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,938 psi | 52% | 2598 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,612 psi | 67% | 2835 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 46,615 psi | 73% | 2943 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 46,311 psi | 73% | 2812 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 36,767 psi | 58% | 2657 fps | 96.7% |
| Bofors RP30 | <<locked>> | 84% | 34,983 psi | 55% | 2644 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 39,465 psi | 62% | 2723 fps | 97.7% |
| Bofors RP7 | <<locked>> | 80% | 53,925 psi | 85% | 2897 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 33,634 psi | 53% | 2582 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 53,795 psi | 84% | 2953 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,452 psi | 65% | 2720 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,785 psi | 64% | 2703 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,195 psi | 74% | 2776 fps | 100% |
| Hodgdon Retumbo | 64.9 gr | 80% | 32,155 psi | 50% | 2621 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,195 psi | 44% | 1686 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,168 psi | 77% | 2831 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 49,559 psi | 78% | 2838 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,801 psi | 67% | 2713 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 37,666 psi | 59% | 2697 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 92% | 35,621 psi | 56% | 2680 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 52,852 psi | 83% | 2864 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,256 psi | 80% | 2864 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,142 psi | 54% | 2526 fps | 98.3% |
| Norma 204 | <<locked>> | 80% | 49,806 psi | 78% | 2881 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 31,270 psi | 49% | 2585 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 41,655 psi | 65% | 2795 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 50,908 psi | 80% | 2881 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,289 psi | 58% | 2700 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 80% | 49,806 psi | 78% | 2884 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,475 psi | 52% | 2579 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,863 psi | 45% | 1726 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,489 psi | 82% | 2923 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,720 psi | 79% | 2943 fps | 100% |
| ReloadSwiss RS 76 | 69.5 gr | 80% | 31,285 psi | 49% | 2595 fps | 96.5% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 40,973 psi | 64% | 2818 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 44,628 psi | 70% | 2759 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 43,018 psi | 67% | 2766 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 80% | 53,925 psi | 85% | 2897 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,852 psi | 83% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,256 psi | 80% | 2864 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,634 psi | 81% | 2815 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,685 psi | 67% | 2759 fps | 98.4% |
| Somchem S361 | <<locked>> | 80% | 45,426 psi | 71% | 2746 fps | 97.3% |
| Somchem S365 | <<locked>> | 80% | 48,312 psi | 76% | 2831 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,511 psi | 68% | 2743 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 80% | 52,359 psi | 82% | 2871 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,884 psi | 59% | 2615 fps | 97.7% |
| Vihtavuori N550 | <<locked>> | 80% | 51,677 psi | 81% | 2877 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,583 psi | 67% | 2753 fps | 100% |
| Vihtavuori N560 | 67.4 gr | 80% | 41,539 psi | 65% | 2789 fps | 96.5% |
| Vihtavuori N565 | <<locked>> | 82% | 36,782 psi | 58% | 2661 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 90% | 42,293 psi | 66% | 2835 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 96% | 49,676 psi | 78% | 3022 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,547 psi | 81% | 2822 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,795 psi | 84% | 2953 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,331 psi | 55% | 2720 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,784 psi | 62% | 2667 fps | 97.7% |
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 76 powders for 7 x 66 SE v. Hofe loaded with the .284 | 160gr | Winchester Silvertip. Vihtavuori N570 delivers the highest muzzle velocity at 3,156 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,156 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 1:16.0 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 | Winchester Silvertip they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-50, IMR 7977 Enduron, Lovex D100 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.