Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 175gr | 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 Winchester StaBALL HD.
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% | 54,665 psi | 86% | 2792 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,477 psi | 87% | 2812 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 56,101 psi | 88% | 2946 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 90% | 57,014 psi | 89% | 2953 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 88% | 56,144 psi | 88% | 2877 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 54,128 psi | 85% | 2890 fps | 99.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,883 psi | 88% | 2917 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 48,486 psi | 76% | 2884 fps | 96.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,517 psi | 79% | 2884 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,623 psi | 89% | 2864 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,811 psi | 87% | 2867 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 54,520 psi | 85% | 2887 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,144 psi | 88% | 2848 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 55,796 psi | 87% | 2920 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 56,623 psi | 89% | 2940 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 52,968 psi | 83% | 2946 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,172 psi | 86% | 2851 fps | 98% |
| Bofors RP15 | <<locked>> | 94% | 57,377 psi | 90% | 2927 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 55,608 psi | 87% | 2933 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 54,520 psi | 85% | 2887 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 57,014 psi | 89% | 2808 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 53,882 psi | 84% | 2884 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 56,840 psi | 89% | 2867 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 57,392 psi | 90% | 2881 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,405 psi | 88% | 2867 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,695 psi | 89% | 2785 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 54,752 psi | 86% | 3002 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 57,580 psi | 90% | 2907 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,521 psi | 59% | 1775 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,463 psi | 87% | 2802 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 55,782 psi | 87% | 2802 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 54,563 psi | 86% | 2805 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 92% | 56,231 psi | 88% | 2930 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,963 psi | 72% | 2795 fps | 99% |
| Lovex S065 | <<locked>> | 82% | 55,811 psi | 87% | 2776 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,551 psi | 90% | 2828 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,130 psi | 88% | 2812 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,304 psi | 88% | 2858 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 46,485 psi | 73% | 2822 fps | 100% |
| Norma MRP | <<locked>> | 88% | 54,346 psi | 85% | 2900 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,319 psi | 90% | 2841 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 57,276 psi | 90% | 2953 fps | 100% |
| Ramshot Hunter | <<locked>> | 84% | 56,115 psi | 88% | 2854 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 55,550 psi | 87% | 2884 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,464 psi | 60% | 1818 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 55,463 psi | 87% | 2835 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 53,882 psi | 84% | 2861 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,129 psi | 86% | 2992 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 54,505 psi | 85% | 2956 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 88% | 57,174 psi | 90% | 2848 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 88% | 55,477 psi | 87% | 2858 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 57,014 psi | 89% | 2808 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,811 psi | 87% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,551 psi | 90% | 2828 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 54,592 psi | 86% | 2730 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,071 psi | 86% | 2854 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 54,839 psi | 86% | 2785 fps | 99.3% |
| Somchem S365 | <<locked>> | 84% | 54,868 psi | 86% | 2795 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,854 psi | 88% | 2828 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 55,347 psi | 87% | 2782 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,579 psi | 87% | 2815 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 54,302 psi | 85% | 2828 fps | 96.1% |
| Vihtavuori N550 | <<locked>> | 82% | 54,505 psi | 85% | 2789 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 54,679 psi | 86% | 2825 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,012 psi | 85% | 2904 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 94% | 54,520 psi | 85% | 2894 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 98% | 55,187 psi | 86% | 2956 fps | 99.1% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 56,217 psi | 88% | 3015 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 54,679 psi | 86% | 2740 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,101 psi | 89% | 2867 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 54,926 psi | 86% | 2936 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,550 psi | 87% | 2825 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% | 39,117 psi | 61% | 2530 fps | 99.6% |
| Accurate 4350 | <<locked>> | 80% | 51,837 psi | 81% | 2756 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 42,583 psi | 67% | 2703 fps | 98% |
| Accurate MAGPRO | <<locked>> | 80% | 40,248 psi | 63% | 2644 fps | 96.1% |
| ADI AR 2209 | <<locked>> | 80% | 43,134 psi | 68% | 2654 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 38,609 psi | 61% | 2595 fps | 96.7% |
| ADI AR 2217 | <<locked>> | 86% | 35,056 psi | 55% | 2513 fps | 95.8% |
| ADI AR 2218 | <<locked>> | 98% | 45,136 psi | 71% | 2815 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 82% | 27,905 psi | 44% | 2359 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,516 psi | 78% | 2759 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,076 psi | 68% | 2648 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,117 psi | 61% | 2602 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,797 psi | 59% | 2549 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,663 psi | 51% | 2484 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,119 psi | 66% | 2707 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 45,513 psi | 71% | 2812 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,062 psi | 67% | 2628 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 36,448 psi | 57% | 2539 fps | 97.2% |
| Bofors RP30 | <<locked>> | 82% | 32,242 psi | 51% | 2470 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 39,117 psi | 61% | 2602 fps | 98.1% |
| Bofors RP7 | <<locked>> | 80% | 53,519 psi | 84% | 2756 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 33,330 psi | 52% | 2467 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 53,316 psi | 84% | 2812 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,002 psi | 64% | 2592 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,451 psi | 63% | 2582 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,847 psi | 73% | 2644 fps | 100% |
| Hodgdon Retumbo | 60.1 gr | 80% | 31,836 psi | 50% | 2507 fps | 96.4% |
| Hodgdon Superformance | <<locked>> | 80% | 53,447 psi | 84% | 2848 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,224 psi | 44% | 1588 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,907 psi | 77% | 2697 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,037 psi | 77% | 2703 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,540 psi | 67% | 2592 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 80% | 37,304 psi | 58% | 2575 fps | 96.4% |
| IMR 8133 Enduron | <<locked>> | 90% | 32,909 psi | 52% | 2507 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 52,417 psi | 82% | 2726 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,937 psi | 80% | 2726 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 33,852 psi | 53% | 2415 fps | 98.7% |
| Norma 204 | <<locked>> | 80% | 49,400 psi | 77% | 2746 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 28,906 psi | 45% | 2418 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 41,133 psi | 64% | 2667 fps | 99.4% |
| Norma URP | <<locked>> | 80% | 50,560 psi | 79% | 2743 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 36,956 psi | 58% | 2579 fps | 96.7% |
| Ramshot Hunter | <<locked>> | 80% | 49,385 psi | 77% | 2749 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 32,982 psi | 52% | 2461 fps | 97.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,776 psi | 45% | 1621 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,967 psi | 81% | 2782 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,154 psi | 79% | 2805 fps | 100% |
| ReloadSwiss RS 76 | 64.4 gr | 80% | 30,937 psi | 48% | 2484 fps | 97.2% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 37,405 psi | 59% | 2631 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 44,295 psi | 69% | 2631 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 80% | 42,511 psi | 67% | 2635 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 80% | 53,519 psi | 84% | 2756 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,417 psi | 82% | 2726 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,937 psi | 80% | 2726 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,184 psi | 80% | 2677 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,177 psi | 66% | 2631 fps | 98.8% |
| Somchem S361 | <<locked>> | 80% | 44,947 psi | 70% | 2618 fps | 97.7% |
| Somchem S365 | <<locked>> | 80% | 47,979 psi | 75% | 2697 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,149 psi | 68% | 2618 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 51,851 psi | 81% | 2730 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,507 psi | 59% | 2497 fps | 98.2% |
| Vihtavuori N170 | <<locked>> | 94% | 50,705 psi | 79% | 2769 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 51,140 psi | 80% | 2740 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,148 psi | 66% | 2621 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,060 psi | 64% | 2661 fps | 97% |
| Vihtavuori N565 | <<locked>> | 82% | 36,361 psi | 57% | 2546 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 88% | 38,783 psi | 61% | 2648 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 94% | 45,353 psi | 71% | 2822 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,140 psi | 80% | 2690 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,316 psi | 84% | 2812 fps | 100% |
| Winchester StaBALL HD | 61.8 gr | 80% | 34,838 psi | 55% | 2598 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,552 psi | 62% | 2546 fps | 98.1% |
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 | 175gr | Sierra MatchKing. Vihtavuori N570 delivers the highest muzzle velocity at 3,015 fps; across all powders the maximum-charge window runs from 1,775 fps to 3,015 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 175.0 gr projectile in 0.284" calls for a 1:10.0 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, Winchester StaBALL HD rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 175gr | 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.