Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 173gr | RWS H-Mantel bullet and 76 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% | 55,317 psi | 87% | 2818 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,173 psi | 88% | 2838 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 57,000 psi | 89% | 2979 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 53,998 psi | 85% | 2923 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 88% | 56,913 psi | 89% | 2907 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 54,810 psi | 86% | 2917 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,811 psi | 89% | 2946 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 49,327 psi | 77% | 2920 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,169 psi | 80% | 2910 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 56,536 psi | 89% | 2894 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 57,174 psi | 90% | 2904 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,072 psi | 89% | 2890 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,521 psi | 89% | 2897 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,201 psi | 87% | 2913 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,913 psi | 89% | 2877 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,724 psi | 89% | 2949 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,508 psi | 90% | 2969 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,925 psi | 85% | 2979 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,811 psi | 87% | 2881 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,724 psi | 87% | 2881 fps | 98.1% |
| Bofors RP15 | <<locked>> | 92% | 54,665 psi | 86% | 2907 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 56,347 psi | 88% | 2963 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 55,201 psi | 87% | 2913 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 57,406 psi | 90% | 2835 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,607 psi | 86% | 2913 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 57,435 psi | 90% | 2894 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,375 psi | 85% | 2854 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,014 psi | 89% | 2894 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,348 psi | 90% | 2812 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,622 psi | 87% | 3035 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,478 psi | 59% | 1791 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,028 psi | 88% | 2828 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,420 psi | 88% | 2831 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,201 psi | 87% | 2835 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 92% | 56,913 psi | 89% | 2959 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,891 psi | 73% | 2828 fps | 99.1% |
| Lovex S065 | <<locked>> | 82% | 56,188 psi | 88% | 2802 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 54,665 psi | 86% | 2805 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,811 psi | 89% | 2838 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,130 psi | 90% | 2887 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,043 psi | 89% | 2887 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 47,326 psi | 74% | 2851 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 47,514 psi | 74% | 2854 fps | 100% |
| Norma MRP | <<locked>> | 88% | 55,288 psi | 87% | 2933 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,404 psi | 85% | 2818 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 53,998 psi | 85% | 2923 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 56,898 psi | 89% | 2884 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,318 psi | 88% | 2910 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,421 psi | 60% | 1834 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,260 psi | 88% | 2864 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,694 psi | 86% | 2890 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,362 psi | 88% | 3028 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,622 psi | 87% | 2992 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 88% | 57,638 psi | 90% | 2874 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 88% | 56,246 psi | 88% | 2890 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 57,406 psi | 90% | 2835 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,188 psi | 88% | 2802 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,665 psi | 86% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,172 psi | 86% | 2759 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,840 psi | 88% | 2884 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 55,376 psi | 87% | 2815 fps | 99.3% |
| Somchem S365 | <<locked>> | 84% | 55,535 psi | 87% | 2825 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,521 psi | 89% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 55,985 psi | 88% | 2812 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,202 psi | 88% | 2841 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 55,100 psi | 86% | 2861 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 82% | 55,303 psi | 87% | 2818 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,506 psi | 87% | 2854 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,868 psi | 86% | 2933 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 94% | 55,245 psi | 87% | 2923 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 98% | 56,333 psi | 88% | 2992 fps | 99.2% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,406 psi | 90% | 3051 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,361 psi | 87% | 2762 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,696 psi | 90% | 2897 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 55,985 psi | 88% | 2966 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,420 psi | 88% | 2858 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% | 39,711 psi | 62% | 2556 fps | 99.7% |
| Accurate 4350 | <<locked>> | 80% | 52,576 psi | 82% | 2785 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 43,163 psi | 68% | 2733 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 80% | 40,756 psi | 64% | 2671 fps | 96.2% |
| ADI AR 2209 | <<locked>> | 80% | 43,569 psi | 68% | 2680 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 80% | 38,972 psi | 61% | 2618 fps | 96.8% |
| ADI AR 2217 | <<locked>> | 86% | 35,447 psi | 56% | 2536 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 98% | 45,934 psi | 72% | 2848 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 82% | 28,297 psi | 44% | 2385 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,714 psi | 69% | 2674 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,092 psi | 69% | 2680 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,299 psi | 79% | 2789 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,685 psi | 68% | 2677 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,523 psi | 62% | 2628 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,305 psi | 60% | 2575 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,040 psi | 52% | 2507 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,714 psi | 67% | 2733 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 46,499 psi | 73% | 2844 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,598 psi | 68% | 2654 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,526 psi | 68% | 2654 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 36,869 psi | 58% | 2566 fps | 97.3% |
| Bofors RP30 | <<locked>> | 82% | 32,764 psi | 51% | 2497 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 39,523 psi | 62% | 2628 fps | 98.2% |
| Bofors RP7 | <<locked>> | 80% | 53,954 psi | 85% | 2782 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 33,794 psi | 53% | 2493 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 53,940 psi | 85% | 2841 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,539 psi | 65% | 2621 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,799 psi | 64% | 2605 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,355 psi | 74% | 2667 fps | 100% |
| Hodgdon Retumbo | 61.4 gr | 80% | 32,329 psi | 51% | 2539 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,195 psi | 44% | 1601 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,284 psi | 77% | 2723 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,676 psi | 78% | 2730 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,888 psi | 67% | 2615 fps | 97.4% |
| IMR 7828 SSC | <<locked>> | 80% | 37,695 psi | 59% | 2598 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 90% | 33,475 psi | 52% | 2536 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 52,852 psi | 83% | 2753 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,358 psi | 80% | 2753 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,156 psi | 54% | 2434 fps | 98.8% |
| Norma 204 | <<locked>> | 80% | 49,835 psi | 78% | 2772 fps | 99.6% |
| Norma 204 | <<locked>> | 80% | 50,009 psi | 78% | 2776 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 29,385 psi | 46% | 2444 fps | 95.8% |
| Norma 217 | <<locked>> | 86% | 29,341 psi | 46% | 2444 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 41,727 psi | 65% | 2697 fps | 99.5% |
| Norma URP | <<locked>> | 80% | 51,024 psi | 80% | 2769 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,463 psi | 59% | 2608 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 80% | 49,966 psi | 78% | 2779 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,591 psi | 53% | 2493 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,921 psi | 45% | 1640 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,547 psi | 82% | 2808 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,981 psi | 80% | 2835 fps | 100% |
| ReloadSwiss RS 76 | 65.7 gr | 80% | 31,328 psi | 49% | 2510 fps | 97.3% |
| ReloadSwiss RS 80 | 72.9 gr | 88% | 38,087 psi | 60% | 2661 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 44,701 psi | 70% | 2654 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 80% | 43,120 psi | 68% | 2664 fps | 99% |
| Rottweil R 907 | <<locked>> | 80% | 53,954 psi | 85% | 2782 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,852 psi | 83% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,358 psi | 80% | 2753 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,808 psi | 81% | 2707 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,786 psi | 67% | 2661 fps | 98.9% |
| Somchem S361 | <<locked>> | 80% | 45,600 psi | 71% | 2648 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 48,443 psi | 76% | 2723 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,555 psi | 68% | 2641 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 52,518 psi | 82% | 2759 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,043 psi | 60% | 2523 fps | 98.3% |
| Vihtavuori N170 | <<locked>> | 94% | 51,503 psi | 81% | 2802 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 51,750 psi | 81% | 2766 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,844 psi | 67% | 2651 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,626 psi | 65% | 2690 fps | 97.2% |
| Vihtavuori N565 | <<locked>> | 82% | 36,869 psi | 58% | 2569 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 88% | 39,508 psi | 62% | 2677 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 94% | 46,224 psi | 72% | 2854 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,590 psi | 81% | 2713 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,940 psi | 85% | 2841 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,534 psi | 56% | 2625 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,074 psi | 63% | 2575 fps | 98.3% |
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 | 173gr | RWS H-Mantel. Vihtavuori N570 delivers the highest muzzle velocity at 3,051 fps; across all powders the maximum-charge window runs from 1,791 fps to 3,051 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 173.0 gr projectile in 0.284" calls for a 1:11.0 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, ReloadSwiss RS 80 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 173gr | RWS H-Mantel 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.