Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 177gr | RWS ID Classic bullet and 65 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 ReloadSwiss RS 80.
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% | 57,130 psi | 90% | 2818 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 55,085 psi | 86% | 2923 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 56,028 psi | 88% | 2933 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 86% | 54,998 psi | 86% | 2854 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 56,869 psi | 89% | 2927 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 55,042 psi | 86% | 2897 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,227 psi | 80% | 2940 fps | 97.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,359 psi | 84% | 2920 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,100 psi | 86% | 2848 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,317 psi | 87% | 2838 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 54,491 psi | 85% | 2841 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,232 psi | 90% | 2917 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,187 psi | 86% | 2825 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,969 psi | 86% | 2894 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,564 psi | 87% | 2913 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,347 psi | 88% | 2992 fps | 98.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 47,834 psi | 75% | 2844 fps | 96.2% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,537 psi | 90% | 2887 fps | 98.6% |
| Bofors RP15 | <<locked>> | 92% | 56,405 psi | 88% | 2907 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 54,868 psi | 86% | 2910 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 57,232 psi | 90% | 2917 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 56,681 psi | 89% | 2920 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 56,246 psi | 88% | 2861 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,085 psi | 86% | 2841 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,535 psi | 87% | 2762 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 53,940 psi | 85% | 2979 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,681 psi | 59% | 1781 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,406 psi | 90% | 2825 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 54,433 psi | 85% | 2776 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,695 psi | 89% | 2835 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 90% | 55,056 psi | 86% | 2907 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,936 psi | 77% | 2841 fps | 99.5% |
| Lovex S070 | <<locked>> | 82% | 56,260 psi | 88% | 2802 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,216 psi | 87% | 2792 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,955 psi | 86% | 2831 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 49,676 psi | 78% | 2861 fps | 100% |
| Norma MRP | <<locked>> | 88% | 57,421 psi | 90% | 2936 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,130 psi | 88% | 2818 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,304 psi | 88% | 2930 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 54,897 psi | 86% | 2828 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,389 psi | 85% | 2858 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,609 psi | 61% | 1824 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,565 psi | 89% | 2890 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,563 psi | 86% | 2972 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 53,838 psi | 84% | 2936 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 86% | 55,709 psi | 87% | 2822 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 54,186 psi | 85% | 2831 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,260 psi | 88% | 2802 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,710 psi | 89% | 2756 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,609 psi | 90% | 2887 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 57,072 psi | 89% | 2815 fps | 99.6% |
| Somchem S365 | <<locked>> | 84% | 57,203 psi | 90% | 2818 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 54,737 psi | 86% | 2805 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,696 psi | 90% | 2808 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 54,346 psi | 85% | 2789 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 56,855 psi | 89% | 2867 fps | 97% |
| Vihtavuori N550 | <<locked>> | 82% | 56,724 psi | 89% | 2812 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,392 psi | 90% | 2851 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,927 psi | 89% | 2940 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 94% | 57,334 psi | 90% | 2930 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 96% | 54,549 psi | 85% | 2940 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 98% | 55,593 psi | 87% | 2999 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,985 psi | 89% | 2759 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,433 psi | 85% | 2913 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,215 psi | 85% | 2799 fps | 100% |
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% | 41,046 psi | 64% | 2559 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 44,831 psi | 70% | 2740 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 80% | 42,322 psi | 66% | 2680 fps | 97.1% |
| ADI AR 2209 | <<locked>> | 80% | 45,107 psi | 71% | 2684 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 40,379 psi | 63% | 2628 fps | 97.6% |
| ADI AR 2217 | <<locked>> | 84% | 34,389 psi | 54% | 2490 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 96% | 44,353 psi | 70% | 2795 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 27,470 psi | 43% | 2339 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,397 psi | 71% | 2684 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,866 psi | 81% | 2785 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,976 psi | 70% | 2677 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,031 psi | 64% | 2635 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,871 psi | 62% | 2579 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,389 psi | 54% | 2520 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,498 psi | 70% | 2740 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 45,121 psi | 71% | 2795 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 98% | 44,338 psi | 69% | 2776 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 42,032 psi | 66% | 2605 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 38,145 psi | 60% | 2572 fps | 98% |
| Bofors RP30 | <<locked>> | 80% | 31,821 psi | 50% | 2448 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 41,031 psi | 64% | 2635 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 32,663 psi | 51% | 2448 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 42,975 psi | 67% | 2628 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,250 psi | 66% | 2612 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,805 psi | 76% | 2664 fps | 100% |
| Hodgdon Retumbo | 62.2 gr | 80% | 33,489 psi | 52% | 2549 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,311 psi | 44% | 1591 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,821 psi | 80% | 2723 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 51,126 psi | 80% | 2726 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,222 psi | 69% | 2621 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 80% | 39,131 psi | 61% | 2612 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 88% | 32,648 psi | 51% | 2493 fps | 95.3% |
| Lovex S070 | <<locked>> | 80% | 52,707 psi | 83% | 2749 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,389 psi | 55% | 2441 fps | 99.2% |
| Norma 204 | <<locked>> | 80% | 51,358 psi | 80% | 2776 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 28,674 psi | 45% | 2398 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 43,366 psi | 68% | 2703 fps | 99.8% |
| Norma URP | <<locked>> | 80% | 52,504 psi | 82% | 2766 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,001 psi | 61% | 2621 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 80% | 51,387 psi | 81% | 2776 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,809 psi | 55% | 2500 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,051 psi | 46% | 1631 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,562 psi | 82% | 2831 fps | 100% |
| ReloadSwiss RS 76 | 66.6 gr | 80% | 32,576 psi | 51% | 2526 fps | 98.3% |
| ReloadSwiss RS 80 | 72.2 gr | 86% | 36,927 psi | 58% | 2612 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 45,963 psi | 72% | 2657 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 80% | 44,498 psi | 70% | 2667 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 52,707 psi | 83% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,084 psi | 83% | 2703 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,164 psi | 69% | 2661 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 46,746 psi | 73% | 2648 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 50,256 psi | 79% | 2720 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,049 psi | 71% | 2644 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 53,969 psi | 85% | 2756 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,262 psi | 62% | 2526 fps | 98.8% |
| Vihtavuori N170 | <<locked>> | 92% | 49,821 psi | 78% | 2749 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 53,171 psi | 83% | 2762 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,295 psi | 69% | 2651 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,178 psi | 68% | 2697 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 80% | 35,795 psi | 56% | 2523 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 86% | 38,319 psi | 60% | 2628 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 92% | 44,933 psi | 70% | 2805 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,156 psi | 83% | 2710 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,217 psi | 58% | 2631 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,307 psi | 65% | 2575 fps | 98.8% |
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 65 powders for 7 x 66 SE v. Hofe loaded with the .284 | 177gr | RWS ID Classic. Vihtavuori N570 delivers the highest muzzle velocity at 2,999 fps; across all powders the maximum-charge window runs from 1,781 fps to 2,999 fps. ADI AR 2218 gives the best case fill at 100 %, and 65 of the 65 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 177.0 gr projectile in 0.284" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, 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, ReloadSwiss RS 80 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 177gr | RWS ID Classic 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.