Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 170gr | Geco PLUS 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 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% | 55,492 psi | 87% | 2848 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,275 psi | 88% | 2867 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 54,302 psi | 85% | 2953 fps | 99% |
| ADI AR 2209 | <<locked>> | 88% | 57,058 psi | 89% | 2936 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 55,187 psi | 86% | 2949 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,000 psi | 89% | 2976 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 49,472 psi | 78% | 2946 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,474 psi | 81% | 2940 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 57,348 psi | 90% | 2933 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 57,348 psi | 90% | 2933 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,435 psi | 90% | 2923 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,695 psi | 89% | 2927 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,550 psi | 87% | 2946 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,072 psi | 89% | 2904 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,000 psi | 89% | 2979 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 53,650 psi | 84% | 2940 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,389 psi | 85% | 3009 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,072 psi | 88% | 2910 fps | 98.1% |
| Bofors RP15 | <<locked>> | 92% | 54,752 psi | 86% | 2933 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 56,579 psi | 89% | 2989 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 55,550 psi | 87% | 2946 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 57,537 psi | 90% | 2864 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,853 psi | 86% | 2943 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 57,740 psi | 90% | 2923 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,752 psi | 86% | 2884 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,363 psi | 90% | 2927 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,435 psi | 90% | 2841 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,854 psi | 88% | 3064 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,449 psi | 59% | 1814 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,072 psi | 88% | 2858 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,463 psi | 88% | 2858 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,376 psi | 87% | 2864 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 92% | 57,217 psi | 90% | 2992 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,108 psi | 74% | 2858 fps | 99.1% |
| Lovex S065 | <<locked>> | 82% | 56,318 psi | 88% | 2831 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 54,752 psi | 86% | 2831 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,913 psi | 89% | 2867 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,276 psi | 90% | 2917 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 47,688 psi | 75% | 2881 fps | 100% |
| Norma MRP | <<locked>> | 88% | 55,376 psi | 87% | 2959 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,520 psi | 85% | 2848 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,346 psi | 85% | 2953 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 57,101 psi | 89% | 2913 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,724 psi | 89% | 2943 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,363 psi | 60% | 1857 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,507 psi | 89% | 2894 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,897 psi | 86% | 2920 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,420 psi | 88% | 3054 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,840 psi | 88% | 3018 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 86% | 54,389 psi | 85% | 2851 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 56,434 psi | 88% | 2920 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 57,537 psi | 90% | 2864 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,318 psi | 88% | 2831 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,752 psi | 86% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,477 psi | 87% | 2789 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,028 psi | 88% | 2913 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 55,680 psi | 87% | 2844 fps | 99.3% |
| Somchem S365 | <<locked>> | 84% | 55,608 psi | 87% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,666 psi | 89% | 2884 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,086 psi | 88% | 2838 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,507 psi | 89% | 2871 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 55,230 psi | 87% | 2887 fps | 96.2% |
| Vihtavuori N550 | <<locked>> | 82% | 55,332 psi | 87% | 2844 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,506 psi | 87% | 2881 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,998 psi | 86% | 2963 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 94% | 55,521 psi | 87% | 2949 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 98% | 56,405 psi | 88% | 3015 fps | 99.1% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,696 psi | 90% | 3084 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,521 psi | 87% | 2792 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,740 psi | 90% | 2923 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,347 psi | 88% | 2995 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,463 psi | 88% | 2884 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% | 39,842 psi | 62% | 2582 fps | 99.7% |
| Accurate 4350 | <<locked>> | 80% | 52,736 psi | 83% | 2815 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 40,959 psi | 64% | 2700 fps | 96.2% |
| ADI AR 2209 | <<locked>> | 80% | 43,714 psi | 69% | 2707 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 39,073 psi | 61% | 2641 fps | 96.7% |
| ADI AR 2217 | <<locked>> | 86% | 35,636 psi | 56% | 2562 fps | 95.8% |
| ADI AR 2218 | <<locked>> | 98% | 46,137 psi | 72% | 2877 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 82% | 28,471 psi | 45% | 2411 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,222 psi | 69% | 2710 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,222 psi | 69% | 2710 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,270 psi | 79% | 2815 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,816 psi | 69% | 2703 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,624 psi | 62% | 2654 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,450 psi | 60% | 2602 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,170 psi | 52% | 2533 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,931 psi | 67% | 2759 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 46,760 psi | 73% | 2874 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,642 psi | 68% | 2677 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 36,985 psi | 58% | 2589 fps | 97.2% |
| Bofors RP30 | <<locked>> | 82% | 32,866 psi | 52% | 2520 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 39,624 psi | 62% | 2654 fps | 98.1% |
| Bofors RP7 | <<locked>> | 80% | 54,099 psi | 85% | 2812 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 33,837 psi | 53% | 2516 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 54,041 psi | 85% | 2871 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,640 psi | 65% | 2648 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,915 psi | 64% | 2631 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,340 psi | 74% | 2694 fps | 100% |
| Hodgdon Retumbo | 62.4 gr | 80% | 32,416 psi | 51% | 2562 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 44% | 1621 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,429 psi | 77% | 2749 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,835 psi | 78% | 2759 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,018 psi | 67% | 2641 fps | 97.4% |
| IMR 7828 SSC | <<locked>> | 80% | 37,797 psi | 59% | 2625 fps | 96.4% |
| IMR 8133 Enduron | <<locked>> | 90% | 33,620 psi | 53% | 2559 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 53,026 psi | 83% | 2779 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,517 psi | 81% | 2779 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,360 psi | 54% | 2461 fps | 98.7% |
| Norma 204 | <<locked>> | 80% | 50,053 psi | 78% | 2802 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 29,515 psi | 46% | 2467 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 41,989 psi | 66% | 2726 fps | 99.5% |
| Norma URP | <<locked>> | 80% | 51,198 psi | 80% | 2799 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,550 psi | 59% | 2631 fps | 96.7% |
| Ramshot Hunter | <<locked>> | 80% | 50,053 psi | 78% | 2802 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,634 psi | 53% | 2513 fps | 97.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,834 psi | 45% | 1660 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,634 psi | 82% | 2838 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,995 psi | 80% | 2861 fps | 100% |
| ReloadSwiss RS 76 | 66.8 gr | 80% | 31,502 psi | 49% | 2536 fps | 97.3% |
| ReloadSwiss RS 80 | 74.1 gr | 88% | 38,276 psi | 60% | 2687 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 44,860 psi | 70% | 2684 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 80% | 43,279 psi | 68% | 2690 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 80% | 54,099 psi | 85% | 2812 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,026 psi | 83% | 2779 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,517 psi | 81% | 2779 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,909 psi | 81% | 2733 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,931 psi | 67% | 2687 fps | 98.8% |
| Somchem S361 | <<locked>> | 80% | 45,614 psi | 71% | 2671 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 48,617 psi | 76% | 2749 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,656 psi | 68% | 2667 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 52,663 psi | 83% | 2789 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,159 psi | 60% | 2549 fps | 98.2% |
| Vihtavuori N170 | <<locked>> | 94% | 51,663 psi | 81% | 2828 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 51,851 psi | 81% | 2795 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,004 psi | 67% | 2677 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,858 psi | 66% | 2717 fps | 97.1% |
| Vihtavuori N565 | <<locked>> | 82% | 36,927 psi | 58% | 2592 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 88% | 39,610 psi | 62% | 2700 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 94% | 46,427 psi | 73% | 2881 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,822 psi | 81% | 2743 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,259 psi | 85% | 2871 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,650 psi | 56% | 2651 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,147 psi | 63% | 2598 fps | 98.2% |
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 72 powders for 7 x 66 SE v. Hofe loaded with the .284 | 170gr | Geco PLUS. Vihtavuori N570 delivers the highest muzzle velocity at 3,084 fps; across all powders the maximum-charge window runs from 1,814 fps to 3,084 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 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 170.0 gr projectile in 0.284" calls for a 1:12.5 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, ReloadSwiss RS 80 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 170gr | Geco PLUS 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.