Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 168gr | Sierra MatchKing 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 Accurate High Country.
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>> | 92% | 57,667 psi | 90% | 2894 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 54,926 psi | 86% | 2864 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 55,593 psi | 87% | 2999 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 90% | 56,376 psi | 88% | 3002 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 88% | 55,622 psi | 87% | 2930 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 57,421 psi | 90% | 2999 fps | 99.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,390 psi | 87% | 2966 fps | 99.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,748 psi | 78% | 2930 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,811 psi | 87% | 2917 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,288 psi | 87% | 2920 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,696 psi | 90% | 2992 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 55,535 psi | 87% | 2900 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 55,129 psi | 86% | 2969 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,927 psi | 88% | 2989 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 52,301 psi | 82% | 2992 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 54,694 psi | 86% | 2897 fps | 97.6% |
| Bofors RP15 | <<locked>> | 94% | 56,855 psi | 89% | 2979 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 54,839 psi | 86% | 2979 fps | 99.8% |
| Bofors RP5 | <<locked>> | 92% | 57,696 psi | 90% | 2992 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 56,376 psi | 88% | 2858 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 57,014 psi | 89% | 2989 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 56,231 psi | 88% | 2917 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 56,985 psi | 89% | 2933 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,767 psi | 87% | 2913 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,101 psi | 88% | 2838 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 54,085 psi | 85% | 3051 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 56,898 psi | 89% | 2959 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,420 psi | 59% | 1818 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 54,969 psi | 86% | 2854 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,696 psi | 90% | 2881 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 55,230 psi | 87% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,580 psi | 90% | 2910 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 92% | 55,434 psi | 87% | 2979 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,498 psi | 71% | 2841 fps | 98.7% |
| Lovex S065 | <<locked>> | 82% | 55,172 psi | 86% | 2828 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,014 psi | 89% | 2881 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 55,492 psi | 87% | 2861 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,869 psi | 88% | 2910 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 45,992 psi | 72% | 2867 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 53,896 psi | 84% | 2953 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,739 psi | 89% | 2894 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,579 psi | 89% | 3002 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 84% | 55,666 psi | 87% | 2907 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 54,766 psi | 86% | 2930 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,319 psi | 60% | 1860 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 54,969 psi | 86% | 2887 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 57,232 psi | 90% | 2969 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 54,433 psi | 85% | 3041 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 53,650 psi | 84% | 3002 fps | 99% |
| Rottweil R 904 | <<locked>> | 88% | 56,492 psi | 89% | 2897 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 54,969 psi | 86% | 2910 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 56,376 psi | 88% | 2858 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,172 psi | 86% | 2828 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,014 psi | 89% | 2881 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 54,201 psi | 85% | 2782 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 54,563 psi | 86% | 2907 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 54,273 psi | 85% | 2835 fps | 99% |
| Somchem S365 | <<locked>> | 84% | 54,230 psi | 85% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,317 psi | 87% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 54,853 psi | 86% | 2835 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 54,955 psi | 86% | 2864 fps | 100% |
| Vihtavuori N170 | <<locked>> | 98% | 57,334 psi | 90% | 2933 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 84% | 57,624 psi | 90% | 2894 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,522 psi | 90% | 2923 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,348 psi | 90% | 3012 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 96% | 57,682 psi | 90% | 2999 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 98% | 54,752 psi | 86% | 3005 fps | 98.8% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 55,448 psi | 87% | 3061 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 53,969 psi | 85% | 2785 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 56,463 psi | 88% | 2920 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 54,172 psi | 85% | 2986 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,158 psi | 86% | 2877 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% | 38,740 psi | 61% | 2572 fps | 99.4% |
| Accurate 4350 | <<locked>> | 80% | 51,401 psi | 81% | 2808 fps | 100% |
| Accurate High Country | 63.7 gr | 80% | 42,061 psi | 66% | 2746 fps | 97.6% |
| Accurate MAGPRO | <<locked>> | 80% | 39,697 psi | 62% | 2684 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 42,583 psi | 67% | 2697 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 38,072 psi | 60% | 2631 fps | 96.1% |
| ADI AR 2217 | <<locked>> | 86% | 34,606 psi | 54% | 2546 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 84% | 29,501 psi | 46% | 2457 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,110 psi | 77% | 2812 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,728 psi | 67% | 2694 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,537 psi | 60% | 2641 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,260 psi | 58% | 2592 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,198 psi | 50% | 2520 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,408 psi | 65% | 2749 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 45,136 psi | 71% | 2854 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 45,469 psi | 71% | 2726 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 35,911 psi | 56% | 2579 fps | 96.7% |
| Bofors RP30 | <<locked>> | 84% | 34,055 psi | 53% | 2562 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 38,537 psi | 60% | 2641 fps | 97.7% |
| Bofors RP7 | <<locked>> | 80% | 52,982 psi | 83% | 2808 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 32,953 psi | 52% | 2503 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 52,808 psi | 83% | 2864 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 40,596 psi | 64% | 2635 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 39,885 psi | 63% | 2621 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,282 psi | 73% | 2690 fps | 100% |
| Hodgdon Retumbo | 61.4 gr | 80% | 31,502 psi | 49% | 2546 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 52,895 psi | 83% | 2897 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 44% | 1624 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,327 psi | 76% | 2743 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,259 psi | 85% | 2828 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 48,617 psi | 76% | 2753 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,032 psi | 66% | 2631 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 36,753 psi | 58% | 2612 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 92% | 34,751 psi | 54% | 2602 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 51,880 psi | 81% | 2776 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,372 psi | 79% | 2776 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 33,301 psi | 52% | 2448 fps | 98.3% |
| Norma 204 | <<locked>> | 80% | 48,718 psi | 76% | 2792 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 30,429 psi | 48% | 2507 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 40,582 psi | 64% | 2713 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 49,951 psi | 78% | 2792 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 36,477 psi | 57% | 2618 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 80% | 48,689 psi | 76% | 2795 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 32,532 psi | 51% | 2500 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,834 psi | 45% | 1663 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,358 psi | 80% | 2831 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,472 psi | 78% | 2851 fps | 100% |
| ReloadSwiss RS 76 | 65.7 gr | 80% | 30,487 psi | 48% | 2516 fps | 96.5% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 39,668 psi | 62% | 2733 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 43,787 psi | 69% | 2674 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 42,119 psi | 66% | 2680 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 80% | 52,982 psi | 83% | 2808 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,880 psi | 81% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,372 psi | 79% | 2776 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,821 psi | 80% | 2730 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,785 psi | 65% | 2677 fps | 98.5% |
| Somchem S361 | <<locked>> | 80% | 44,469 psi | 70% | 2661 fps | 97.3% |
| Somchem S365 | <<locked>> | 80% | 47,282 psi | 74% | 2746 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,583 psi | 67% | 2661 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 80% | 51,445 psi | 81% | 2785 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,130 psi | 58% | 2539 fps | 97.8% |
| Vihtavuori N170 | <<locked>> | 96% | 53,824 psi | 84% | 2874 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 50,705 psi | 79% | 2789 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,742 psi | 65% | 2671 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 40,524 psi | 64% | 2703 fps | 96.5% |
| Vihtavuori N565 | <<locked>> | 82% | 35,882 psi | 56% | 2582 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 90% | 41,205 psi | 65% | 2753 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 96% | 48,196 psi | 76% | 2930 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,502 psi | 79% | 2736 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,808 psi | 83% | 2864 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 34,084 psi | 53% | 2638 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,131 psi | 61% | 2589 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 72 powders for 7 x 66 SE v. Hofe loaded with the .284 | 168gr | Sierra MatchKing. Vihtavuori N570 delivers the highest muzzle velocity at 3,061 fps; across all powders the maximum-charge window runs from 1,818 fps to 3,061 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 168.0 gr projectile in 0.284" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, 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, Accurate High Country rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 168gr | Sierra MatchKing 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.