Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 175gr | Barnes X S bullet and 64 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>> | 88% | 54,723 psi | 86% | 2772 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 55,564 psi | 87% | 2920 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 88% | 56,217 psi | 88% | 2923 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 86% | 55,056 psi | 86% | 2844 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 56,652 psi | 89% | 2913 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 54,955 psi | 86% | 2884 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,213 psi | 80% | 2920 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,171 psi | 83% | 2910 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,332 psi | 87% | 2841 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,390 psi | 87% | 2831 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 54,752 psi | 86% | 2835 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,363 psi | 90% | 2910 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,463 psi | 87% | 2822 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,853 psi | 86% | 2890 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,738 psi | 87% | 2910 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,130 psi | 88% | 2982 fps | 98.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 48,341 psi | 76% | 2848 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,101 psi | 89% | 2867 fps | 98.2% |
| Bofors RP15 | <<locked>> | 92% | 56,608 psi | 89% | 2900 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 55,071 psi | 86% | 2907 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 57,363 psi | 90% | 2910 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 56,449 psi | 88% | 2907 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 56,202 psi | 88% | 2844 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,259 psi | 87% | 2831 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,767 psi | 87% | 2753 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 57,537 psi | 90% | 3028 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,739 psi | 59% | 1768 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,638 psi | 90% | 2815 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,274 psi | 87% | 2776 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,739 psi | 89% | 2822 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 54,911 psi | 86% | 2894 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,168 psi | 77% | 2838 fps | 99.4% |
| Lovex S070 | <<locked>> | 82% | 56,840 psi | 89% | 2799 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,115 psi | 88% | 2792 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,085 psi | 86% | 2822 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 49,908 psi | 78% | 2861 fps | 100% |
| Norma MRP | <<locked>> | 88% | 57,363 psi | 90% | 2930 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,478 psi | 89% | 2812 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,985 psi | 88% | 2917 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 55,187 psi | 86% | 2822 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,491 psi | 85% | 2851 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,783 psi | 61% | 1811 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,463 psi | 88% | 2881 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,331 psi | 85% | 2963 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 53,867 psi | 84% | 2930 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 86% | 55,825 psi | 87% | 2808 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 86% | 54,592 psi | 86% | 2825 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,840 psi | 89% | 2799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,319 psi | 90% | 2749 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,740 psi | 90% | 2874 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 57,145 psi | 90% | 2802 fps | 99.5% |
| Somchem S365 | <<locked>> | 84% | 57,740 psi | 90% | 2815 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,303 psi | 87% | 2802 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 54,621 psi | 86% | 2782 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,087 psi | 89% | 2854 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 82% | 57,334 psi | 90% | 2808 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 54,737 psi | 86% | 2805 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,840 psi | 89% | 2930 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 94% | 57,740 psi | 90% | 2923 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 96% | 54,447 psi | 85% | 2927 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 98% | 55,405 psi | 87% | 2989 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,840 psi | 89% | 2749 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,302 psi | 85% | 2913 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,694 psi | 86% | 2795 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% | 42,728 psi | 67% | 2575 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 45,527 psi | 71% | 2743 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 80% | 43,163 psi | 68% | 2687 fps | 96.9% |
| ADI AR 2209 | <<locked>> | 80% | 45,600 psi | 71% | 2680 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 40,959 psi | 64% | 2625 fps | 97.4% |
| ADI AR 2217 | <<locked>> | 84% | 35,317 psi | 55% | 2497 fps | 95.8% |
| ADI AR 2218 | <<locked>> | 98% | 47,993 psi | 75% | 2858 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 28,993 psi | 45% | 2372 fps | 96.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,035 psi | 72% | 2684 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,924 psi | 81% | 2779 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,629 psi | 72% | 2677 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,829 psi | 66% | 2641 fps | 98.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,741 psi | 64% | 2589 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,520 psi | 56% | 2533 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,324 psi | 71% | 2746 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 45,600 psi | 71% | 2795 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 98% | 45,136 psi | 71% | 2785 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 45,107 psi | 71% | 2651 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 39,131 psi | 61% | 2582 fps | 98% |
| Bofors RP30 | <<locked>> | 80% | 33,199 psi | 52% | 2474 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 41,829 psi | 66% | 2641 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 80% | 33,721 psi | 53% | 2457 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 43,526 psi | 68% | 2625 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,801 psi | 67% | 2608 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,327 psi | 77% | 2661 fps | 100% |
| Hodgdon Retumbo | 59.3 gr | 80% | 34,693 psi | 54% | 2569 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,543 psi | 45% | 1581 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,198 psi | 80% | 2717 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 51,982 psi | 81% | 2726 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,831 psi | 70% | 2615 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 80% | 39,755 psi | 62% | 2608 fps | 97.1% |
| IMR 8133 Enduron | <<locked>> | 88% | 34,011 psi | 53% | 2516 fps | 95.5% |
| Lovex S070 | <<locked>> | 80% | 53,476 psi | 84% | 2746 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 37,347 psi | 59% | 2467 fps | 99.4% |
| Norma 204 | <<locked>> | 80% | 51,750 psi | 81% | 2766 fps | 99.7% |
| Norma 217 | <<locked>> | 82% | 28,529 psi | 45% | 2382 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 44,005 psi | 69% | 2707 fps | 99.8% |
| Norma URP | <<locked>> | 80% | 53,040 psi | 83% | 2762 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,682 psi | 62% | 2621 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 80% | 51,880 psi | 81% | 2769 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,897 psi | 56% | 2513 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,356 psi | 46% | 1621 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,692 psi | 83% | 2828 fps | 100% |
| ReloadSwiss RS 76 | 63.5 gr | 80% | 33,881 psi | 53% | 2549 fps | 98.4% |
| ReloadSwiss RS 80 | 68.8 gr | 86% | 37,985 psi | 60% | 2625 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 46,499 psi | 73% | 2651 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 80% | 45,295 psi | 71% | 2667 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 80% | 53,476 psi | 84% | 2746 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,809 psi | 84% | 2700 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,933 psi | 70% | 2664 fps | 99.2% |
| Somchem S361 | <<locked>> | 80% | 47,398 psi | 74% | 2644 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 50,981 psi | 80% | 2723 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,977 psi | 72% | 2648 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 40,248 psi | 63% | 2533 fps | 98.7% |
| Vihtavuori N170 | <<locked>> | 92% | 50,517 psi | 79% | 2746 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 53,954 psi | 85% | 2759 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 45,542 psi | 71% | 2661 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,700 psi | 68% | 2697 fps | 97.7% |
| Vihtavuori N565 | <<locked>> | 80% | 37,188 psi | 58% | 2539 fps | 96% |
| Vihtavuori N568 | <<locked>> | 86% | 39,189 psi | 61% | 2638 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 92% | 45,440 psi | 71% | 2805 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,476 psi | 84% | 2703 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,072 psi | 60% | 2648 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,148 psi | 66% | 2579 fps | 98.7% |
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 64 powders for 7 x 66 SE v. Hofe loaded with the .284 | 175gr | Barnes X S. Hodgdon Retumbo delivers the highest muzzle velocity at 3,028 fps; across all powders the maximum-charge window runs from 1,768 fps to 3,028 fps. ADI AR 2218 gives the best case fill at 100 %, and 64 of the 64 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 175.0 gr projectile in 0.284" calls for a 1:9.5 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 | 175gr | Barnes X S 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.